Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa3b8d6cf684fe82…

MALICIOUS

PDF

66.7 KB Created: 2021-09-22 13:09:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3a317cb1fbbc85c8c7277bb8e9b6391a SHA-1: 1f69072df041e6740ce85dd5a5c64e30fd89aa56 SHA-256: fa3b8d6cf684fe8236ec45f4bb814eafa04a085d05371f86b0f7b80d71b67d7e
144 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as a malicious PDF by ClamAV. Static analysis reveals it functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and potentially disposable hosting. These links likely serve to redirect users to phishing pages or further malicious content, indicating a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4667

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://irlanc.ru/uplcv?utm_term=android+based+desktop+os PDF link annotation
    • http://tms-technology.com/ckfinder/userfiles/files/kozuj.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/abb4f49f1f1e8f03bab50d17129af054/72444451307.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/90392653511.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/katiwufobesibo.pdfIn PDF document text
    • http://www.salac.cz/ckfinder/userfiles/files/6420566339.pdfIn PDF document text
    • https://everestart.com/images/stories/file/wuzulirolekupupemidi.pdfIn PDF document text
    • http://www.mamafoundation.cz/ckfinder/userfiles/files/wevanomojuwibe.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/06bba87bf69d7b2159b8d6a75e1eae22/bozuwezitetimevoxevimewa.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/fujorilinakupimuzu.pdfIn PDF document text
    • http://vektor28.ru/userfiles/file/76903122792.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/12464747875.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/17963745540.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/11885b583d24e8556f42445089c0d1a9/4627497314.pdfIn PDF document text
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sudusapoku.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/ruxogaxusajowesegu.pdfIn PDF document text
    • http://utpcomp.ru/uploads/files/21416165893.pdfIn PDF document text
    • https://marblo.marblobaths.ph/app/webroot/img/files/87372119052.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613551de5c886---39229864931.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/tajijegagufu.pdfIn PDF document text
    • https://rjpexport.com/files/94988483530.pdfIn PDF document text
    • http://emilymillerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/79294695558.pdfIn PDF document text
    • http://homearcky.nl/userfiles/file/rimanaresesidu.pdfIn PDF document text
    • https://coolinterier.sk/upload/files/81245525287.pdfIn PDF document text
    • http://archpiudue.com/userfiles/files/fagilapal.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16147721904477---naseriru.pdfPDF link annotation
    • http://thaisomboonautopart.com/userfiles/files/fobatine.pdfIn PDF document text

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