Malicious PDF — malware analysis report

Static analysis result for SHA-256 d92266ab85cd8843…

MALICIOUS

PDF

79.0 KB Created: 2021-06-17 12:15:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a542fba90bb954aa837e6d1ee57cc008 SHA-1: 781ca122e0e6daf62790b13c92d6d05af256ee78 SHA-256: d92266ab85cd884389e142b95104669b0322d03d7debaf151a1a679f5a78372e
154 Risk Score

Malware Insights

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

The PDF file contains numerous links to external websites, many of which are hosted on compromised CMS platforms, suggesting a link farm designed for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were directly extracted, the structure and URL patterns are consistent with malicious PDF lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9164

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://chcial.ru/uplcv?utm_term=dogar+brothers+books+pdf+download
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/325c96fdb53851674af85a49321e95ea/xovebaxukidobiliwi.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c39da221ac---zekepawotolibasolusep.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16078c8fa23a86---10025865750.pdf
    • http://dioceseofniranam.org/userfiles/file/wazewagabuluwilajefe.pdf
    • http://ascensionchina.com/userfiles/file/fexabugodudedupewi.pdf
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080db247f3e8---bolesibufibemu.pdf
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/03fc1c24ffdd11651d8a413a92c3a1f9/12877991780.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/hje6bq5s35261ukfan5rbeoer0/54027116199.pdf
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/10aea01803f240e9c3cb7a5522805965/93742857916.pdf
    • http://perles-del-beya.com/userfiles/file/21795712165.pdf
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/401de7eb96051a818998f7627c2748a2/95616060929.pdf
    • http://aksaaydinlatma.com/img/editor/image/file/fumuwobolaberudiximutuzub.pdf
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/61250b6672d6218b20a94de7310bae43/35749033931.pdf
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160adb303d8a0d---73368657584.pdf
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/o1tj2fipiequcnh816t45hp3ap/44066825634.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608781650dca4---pugalosukiv.pdf
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/mant96gjkqfuf90jljf0qbosn6/kuzezunagoboke.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f896.bin
448be14774f754f8fb99e276c82f99f92c8205bf78b265f2ec0842a1366a37de		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF896 5600 bytes
font_01_sfnt_off00010bb0.bin
07af8db3e4ebeec3197b1aca86d338a23ef433b5408d06018675295fe8989f9b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB0 11028 bytes

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