Malicious PDF — malware analysis report

Static analysis result for SHA-256 b84da8215df41a32…

MALICIOUS

PDF

49.7 KB Created: 2021-09-03 04:32:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 88b2e2741cfba115707eed9b98009485 SHA-1: 3b789082d03113337eb6965bf0626c351e7e6018 SHA-256: b84da8215df41a324efa50a8c64ea2bec177c92be17f84d3d7844693a8139923
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and multiple external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5892

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/660dd4e94db1c5aaf0892f6edd232cac/wixoragisosikel.pdf In PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/275b6d71e8a145eed2591d7cd5108c53/mijisuwogulimefetaxilor.pdfIn PDF document text
    • http://aviapartner.biz/js/ckfinder/userfiles/files/16380325075.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160dd6e82d62b5---wotekiririzotelapago.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///47812354382.pdfIn PDF document text
    • http://gandolfiarchitetti.com/userfiles/files/tixar.pdfIn PDF document text
    • https://tezerwatch.com/file/upload/files/08-25-05-02-01-68.pdfIn PDF document text
    • https://buka.ru/sadm_files/penekuberoratokowu.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/c21b24ee565a9279b8c4d59fe82c0e93/2210439707.pdfIn PDF document text
    • https://calendarsunrooms.com/userfiles/files/vekipowufekatojibuwarik.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/5000805a740675d0f0ff838d8494a480/nemivodozogisuburupeliz.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8cb311667e---vowenegaxe.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a60935f346---52823992208.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160736b4ee0274---77570516442.pdfIn PDF document text
    • https://kfmaccounting.com/webroot/img/content/files/rufupubuxidanetosiruruw.pdfIn PDF document text
    • http://indianspringhomes.net/userfiles/files/85588649515.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/89c32740f8d65f9afbafb163f8ae1ca5/79088376130.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/83ff2a015c900132be6307d95ffb7a26/56664416344.pdfIn PDF document text
    • http://labmansour.com/app/webroot/js/ckfinder/userfiles/files/vutubamomugukaligozaga.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/395480ef9a249f3cc5d07d7ce49f0be7/muzekadisijuserokofigum.pdfIn PDF document text
    • http://rayzerfamilyreunion.com/clients/0/08/08e2d5bcffca37c2e1a82d364f4296c6/File/30190845108.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/11471326654.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079cfa378504---99141810776.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=pdf+add+watermark+batchPDF link annotation

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