Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b3b21d32469bb3e…

MALICIOUS

PDF

50.7 KB Created: 2021-06-10 05:17:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 1dcc9a176a0624c9ec037b5135e1a721 SHA-1: d094c0e346a43fbafbdb6a4fc26a3a9f03bec705 SHA-256: 5b3b21d32469bb3eb193747cf7656446e18ee3a1ac0c711a3a5f5298bc204f63
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier indicate malicious content, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8547

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://infrive.ru/uplcv?utm_term=body+for+life+aerobic+workout PDF link annotation
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b28679e6d4---bemipunupubatoko.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160a28532b4bb2---1684194403.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb4e5c7edfa---morutunaki.pdfIn PDF document text
    • https://arket.io/wp-content/plugins/super-forms/uploads/php/files/kvqljt6gvpf835fm2lq41jp7mt/15447143036.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/16092380225.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6c5ac4898---9216297814.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16098da25f1d53---vimosaxi.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/l61jlgcu1counbejtg8018kach/wedupivoxogopilofegegapu.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/86bvp22eqp2famag797a2hb8l4/86530303457.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/manikizemetulowawa.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/d30b5a69f72a927d25af669defae50e3/rawivakejufimez.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/142d6f84d8eb1836413fd14bfd454dc7/wedogafelufali.pdfIn PDF document text
    • http://gift-founder.com/archive/upload/files/15540960517.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/6455ec6afc6b556e3d09ee30e84bc926/kitewegifufo.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087431bd862b---60271294089.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9e187f4a5---66294342893.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16091829ea9514---dupiwulomepewatax.pdfIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

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