Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7d6049d9b402b70…

MALICIOUS

PDF

59.5 KB Created: 2021-09-24 11:23:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f0e040635061b94e4b3759aa8f5838bf SHA-1: 5199e229c442957deafd6f54c707764d70f80a95 SHA-256: a7d6049d9b402b70e620ffaf0bb1bdc7dad231e18782f2481e8e0f47e7829460
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5138

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://philabc.ru/uplcv?utm_term=hamraj+old+song PDF link annotation
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/f588fa70f087dfa00bbceebcdfa3bc9d/nasabokuzodabixe.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/kerijisajuvowuf.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/metexezavovaf.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/7480201505.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/l1ecua7niqb0v5tggvmjqtbmkd/26123485294.pdfIn PDF document text
    • https://itandem.net/ckfinder/userfiles/files/9121846148.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ec31ca501---dudijogotoruwixusa.pdfIn PDF document text
    • https://sausalito.com/wysiwygfiles/file/lapetirasibaremor.pdfIn PDF document text

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