MAL-2026-12408

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/pfp-block-independent-iframe/MAL-2026-12408.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-12408
Aliases
  • GHSA-6phh-35j9-99qj
Published
2026-08-05T12:37:05Z
Modified
2026-08-06T01:21:08.019233980Z
Summary
Malicious code in pfp-block-independent-iframe (npm)
Details

-= Per source details. Do not edit below this line.=-

Source: amazon-inspector (2145fdce1d6879c4b5bd3682bf9b8e7c386f3f80f15721c26fe6bd2638564185)

On require of the package, index.js loads bootstrap.js, which selects a platform-specific payload path, fetches bytes from one of four string-obfuscated Cloudflare Workers hostnames (oob-worker.cf99-9b3.workers.dev, oob-worker.cf100-416.workers.dev, oob-worker.cf101-adf.workers.dev, oob-worker.cf102-baf.workers.dev) with a DNS-TXT base64-reassembly fallback via *.dl.well1.site, writes the bytes to /var/tmp/.cache<hex> or %TEMP%\dotnetdiag<hex>.exe, chmods 0755, and spawns the file detached via /bin/sh -c or cmd /c start. Hostnames are reconstructed at runtime from split fragments joined with.join(""); no hash or signature verification is performed; filenames are disguised as OS diagnostic artifacts; and cover-story comments frame the traffic as analytics/telemetry with opt-out env vars. The tarball additionally ships an unreferenced lib/telemetry.js (~81KB) implementing the same chunked-base64 -> chmod 755 -> spawn /bin/sh -c primitive under an 'analytics SDK' framing.

Source: ghsa-malware (8afab21233c95b25115b15ecca1c2db5f3d03aaac132d89443c4836cc4d68093)

Any computer that has this package installed or running should be considered fully compromised. All secrets and keys stored on that computer should be rotated immediately from a different computer. The package should be removed, but as full control of the computer may have been given to an outside entity, there is no guarantee that removing the package will remove all malicious software resulting from installing it.

Database specific 
{
    "malicious-packages-origins": [
        {
            "source": "amazon-inspector",
            "versions": [
                "20.4.9"
            ],
            "import_time": "2026-08-05T13:08:41.613020172Z",
            "id": "IN-MAL-2026-014730",
            "modified_time": "2026-08-05T12:37:05Z",
            "sha256": "2145fdce1d6879c4b5bd3682bf9b8e7c386f3f80f15721c26fe6bd2638564185"
        },
        {
            "source": "ghsa-malware",
            "id": "GHSA-6phh-35j9-99qj",
            "import_time": "2026-08-06T00:58:53.305243652Z",
            "modified_time": "2026-08-05T15:02:58Z",
            "ranges": [
                {
                    "events": [
                        {
                            "introduced": "0"
                        }
                    ],
                    "type": "SEMVER"
                }
            ],
            "sha256": "8afab21233c95b25115b15ecca1c2db5f3d03aaac132d89443c4836cc4d68093"
        }
    ]
}
References
Credits

Affected packages

npm / pfp-block-independent-iframe

Package

Name
pfp-block-independent-iframe
View open source insights on deps.dev
Purl
pkg:npm/pfp-block-independent-iframe

Affected ranges

Type
SEMVER
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

20.*
20.4.9

Database specific

source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/pfp-block-independent-iframe/MAL-2026-12408.json"
indicators 
{
    "evidence_files": [
        {
            "path": "_bootstrap.js",
            "tlsh": "bab1849b166971184bb0ebe5ca174815f657f65333808285fb6ca8941fb326482b3ffc",
            "sha256": "8832589571a944829cf79db31d3987fa70cd9bd6f6cad6a02d2c91309e09e8c9"
        },
        {
            "path": "lib/telemetry.js",
            "tlsh": "e4835055566a242186b2b368df234107ff3685272642429dbafc82dc1fbd72092a5ffc",
            "sha256": "3e8905833d003224a83bf7c2f75d0c6ad29505d7f43bfd731bb3eaf8bd3df20c"
        }
    ],
    "package_integrity": [
        {
            "filename": "pfp-block-independent-iframe-20.4.9.tgz",
            "hashes": {
                "sha512_sri": "sha512-eZJn+DzHpVIlYlsoKQAEdEGA6ssAWBErUB99wAz4f8Tz0Pmqs2JojVcjk+ExtYtdZx635IiliX6w9N7dOIQFug==",
                "sha1": "a7b457eedb0b2ada8e3c64ef8f63593427d181dc"
            }
        }
    ]
}
cwes 
[
    {
        "cweId": "CWE-506",
        "description": "The product contains code that appears to be malicious in nature.",
        "name": "Embedded Malicious Code"
    },
    {
        "cweId": "CWE-506",
        "description": "The product contains code that appears to be malicious in nature.",
        "name": "Embedded Malicious Code"
    }
]