Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c4f62591f02446c…

MALICIOUS

PDF

40.2 KB Created: 2021-09-25 01:54:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4c686ef642a1da63bb915e3feb4d3f3b SHA-1: 9d588e7f2fd01f6d5f5c140fbb28ea7589870c72 SHA-256: 6c4f62591f02446c643d25cdee5495af29acc29cd552814c5aac550dedfc7f83
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting it's designed to lure users to malicious content or phishing pages. The ClamAV detection as 'Pdf.Phishing.Trojan' and the ML classifier's high score further support its malicious nature. The document body is heavily obfuscated and unreadable, providing no direct textual clues, but the overall structure and URL analysis indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6851

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://pistant.ru/uplcv?utm_term=free+followers+free+likes PDF link annotation
    • https://movimientofamiliadejesus.com/images/uploaded/file/basabeg.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/4jd70tfduv2063s9bdie0h5ifp/sedewanoradutusuwi.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/4a8770655ec78d86f50c411f5a8ceb54/1983819427.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/pawefadaguz.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/16143cea00dec5---bimisobidifezoli.pdfIn PDF document text
    • https://chuyennhakienvangvn.net/upload/files/89329861512.pdfIn PDF document text
    • https://ltes2.tw-goods.com/UserFiles/files/nepakopinojetosil.pdfIn PDF document text
    • https://portalbime.com/UploadedFiles/New/file/16725720866.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/81765995761.pdfIn PDF document text
    • http://doingthing.com/downloads/blog/geust/files/rozav.pdfIn PDF document text
    • http://ms-krmelin.cz/app/webroot/files/files/lepebonejebozi.pdfIn PDF document text
    • https://vinatech.com/userfiles/file/rufesonoral.pdfIn PDF document text
    • https://anandalaya.in/resources/file/mibemo.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/76ec60dd17de9d556eb22f82e1ccbd22/55438499639.pdfIn PDF document text