Malicious PDF — malware analysis report

Static analysis result for SHA-256 da188fc4b877ac55…

MALICIOUS

PDF

135.7 KB Created: 2021-05-27 16:06:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 62b278b1bd204856dd2a85239955fa3e SHA-1: c13bef713477ed5cf8a87f3de77e8c0aa872c648 SHA-256: da188fc4b877ac55e78ee086597cdbf125951bc01cef89ee8202e2ae25de76ea
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed to distribute malicious content. The presence of 'utm_term' parameters in some URLs indicates a phishing or SEO manipulation attempt. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9795

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://cructi.ru/uplcv?utm_term=ace+combat+7+trigger+patch PDF link annotation
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/e3a18c02743f611263fb3ed7c50dbe8a/wevozoxivitasub.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/50283843779.pdfIn PDF document text
    • https://clubforeducation.com/FCKeditor/userfiles/file/19124805388.pdfIn PDF document text
    • http://bazis-expertiza.ru/ckfinder/core/connector/php/files/11618680973.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/23291917675.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076cb3388091---68324912673.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/dg0e1u4iggpapmspde5vki6735/85081245504.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/8478a8833174b5c4cc6b12241445756a/fawukonuruw.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/wamizi.pdfIn PDF document text
    • http://vds-construct.pl/userfiles/file/supeponolisasepeb.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160814da11749a---duxegegomoludil.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b62ec7cc0f---lunakar.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609774289107e---dabiru.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/wurafuki.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606fc0454b0c4---nezunatutopaberamafori.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aecfb25d072---69631582237.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607d20da3d172---31773429763.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/ai5qoqjf6a2ktkn30isqhfjv93/gudiligebaxurogagepape.pdfIn PDF document text

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