Malicious PDF — malware analysis report

Static analysis result for SHA-256 924d354febb30f64…

MALICIOUS

PDF

60.6 KB Created: 2021-08-13 23:16:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 38ca3e43b0b4836503ca19ce930a9ae2 SHA-1: b205106b20e58b856dec7f2ca5e86738ed42cf89 SHA-256: 924d354febb30f646b46e343dd509f5daaf3bfd259f46dded9651cc5bf176d36
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm directing to multiple URLs, many of which are hosted on compromised CMS upload storage. The ClamAV detection and ML classifier indicate malicious intent, likely phishing or malware distribution. No scripts were extracted from this sample, but the structure and embedded URLs strongly suggest a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8161

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 http://businessplan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/62524890840.pdf In PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c95ea3695ce---niwefirafakaxunurax.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/160533395660d2ba43de2cd.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/pebuwo.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/ftsn615331sd5h0a6efpimfjpo/menevegewax.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec9edecd5f---nologekuruwevox.pdfIn PDF document text
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/gojivagizab.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/29098683916.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=serendipity+the+accidental+scientists+ielts+reading+answersPDF link annotation

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