Malicious PDF — malware analysis report

Static analysis result for SHA-256 155eb33929b47134…

MALICIOUS

PDF

93.7 KB Created: 2021-05-11 19:54:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9811d1c532817a449230073766933207 SHA-1: 193d245a4c815b386baf25bb856e5bdd8f9e971f SHA-256: 155eb33929b4713446a75f8d96323098b0221d85653cafdf22ba83214c8640d8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains numerous links to external websites, many of which are hosted on compromised CMS platforms, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm heuristics point towards an attempt to exploit users via malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9698

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc2754770c---2592325647.pdf
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/16070e8f395252---surewisuwomiruredaseleda.pdf
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/5cdb45bfc21aebae2e462b7fe6c3b80c/turuzomosuzimid.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/5fe781b9016922f79a985314138fd2a6/44539953721.pdf
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/f46c896e5c2f530bf15866574bc2cf97/59237572611.pdf
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/ph7qht14o65i5pau36v259hevl/mirijiw.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/2f676435618d643fc6194a425a185e48/17665375866.pdf
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/5aecde0aae4052c2c2182f248a8c01c9/gewevivasowidesejo.pdf
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/1eco4mccueikljrn8vheuoora5/84218786443.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b573600e20---4044204633.pdf
    • http://frederickfollows.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160799dae33d4e---kenupojokaserajabu.pdf
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/9lpsi0ejjbgjflsmqp9ne98ma0/75152887038.pdf
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/8c2342b1ba5a77b20d086c63575193d2/82916798075.pdf
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/4fd721a6f6dcba5d53d55b0571c63103/pewufamopip.pdf
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/4088d7ea43f81f715d158d078aa1a36d/buzepu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=film+bioskop+212
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000162f4.bin
7997ce7041d6ff4c88f0edb6a5c2acd294bba8a54afbdbe22a01fb62d5b55a95		 pdf-font-stream PDF embedded font (sfnt) at offset 0x162F4 5004 bytes

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