Malicious PDF — malware analysis report

Static analysis result for SHA-256 221851f4b22a0a6c…

MALICIOUS

PDF

88.6 KB Created: 2021-05-19 22:37:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1544ae5dc6843eb571bc0dc39ea40f68 SHA-1: d5b0d3937504feb24ed0fded8b49873b1e9ad53a SHA-256: 221851f4b22a0a6c3acf08f22082a1aec509550e3b7fc1a6ce32d93799189b5f
154 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads, suggesting a link farm for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a common phishing or malware delivery tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8245

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607942e8974de---38589585628.pdf
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090612f109b2---zaboribululitav.pdf
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/96535950668.pdf
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ecd191f19e---savobazete.pdf
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/c44b3ed282c54505b61a6b8c3a1cb25f/towipuwekonelitex.pdf
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160945f62a6066---paroximisovakolojegovesi.pdf
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/f564ccea2e7acae85be8059497d8a1e4/36884029281.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f9461e7307---20368060372.pdf
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/f9c6147f917df4a78a51b65047242a78/muledumevaxozelixefetiba.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607113c493ae0---rovudozugaxiburipowoja.pdf
    • https://2acontractor.it/images/file/jafitopogajisisebu.pdf
    • http://poltinik.ru/userfiles/file/sunakovoxajevodawa.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160756678d0769---gunotomiladapepipatuzo.pdf
    • http://amphorabeautyclub.com/campannas/file/73108034948.pdf
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/2aa4f33ca24adf40fe25a687f668b1f8/47815366003.pdf
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/f3e7792e7f8a68fa7170da3b3d0e269c/fetiwipizuremoxezimome.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=war+thunder+golden+eagles+generator+2019
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000134a3.bin
1aa8769985b2882c3602306d0b85ca00b10799ba2ad5c5cd12f4f4a5043b773a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x134A3 5580 bytes

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