Malicious PDF — malware analysis report

Static analysis result for SHA-256 fea5129bd8caa7ad…

MALICIOUS

PDF

63.7 KB Created: 2021-04-28 17:12:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 40ec1b6c22af18855f4de4ebf12d99a3 SHA-1: 74a826d5b6ad77c0b71518d1494027fd2ad68935 SHA-256: fea5129bd8caa7ada99f0fc127404a49ac687c840ffe7652dd97460018f7477f
154 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate an attempt to exploit users by directing them to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8701

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://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/20e5d5b9428eb46ba417a7ec2bb315a0/lusirikikewibepowirutis.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083e294aaf6d---jebijalimaxawug.pdf
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4386ad9576b366039691ec14d7c06907/busumudalurasipidiba.pdf
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d5ef3b472---wikalojakatez.pdf
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/slg4gc0ul953te1o66aongkil5/zavibujebujefozizozak.pdf
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/17fd479cc56c450ae7fc383573960824/9953553982.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fb577a1390---kelufolav.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606caf401b0ba---44990031130.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/60ab94c38a20bb201edfaf30a2dd836e/96255561392.pdf
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160773987c0f94---34609911268.pdf
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/3c6c179e9fa1da6136273243373f1408/93226044798.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/fb4168d3bdb164ca0e667d2c45d9207c/tuwoxawajidizakuvonuzexo.pdf
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8836be261---zokibuwu.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1d9e9d4f3---67083539711.pdf
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160714e2881fdb---70744774846.pdf
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7d699e077---netuw.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0e8f2db1a---30402822450.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=baixar+contra+o+calvinismo+pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cfde.bin
1cc34e3f48f7afb0877250f94af4668779e85cef293c9941801b14e80383fddb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCFDE 5476 bytes

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