Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f2bbba839f1e680…

MALICIOUS

PDF

64.0 KB Created: 2021-07-25 19:08:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b553c1f569dfb99863200bdabedf5714 SHA-1: 60557d5a6d13600499d3c505d19b04250b0f0b07 SHA-256: 4f2bbba839f1e680a51e7d38e2f666413b4446d465d454d1295aff5e4e088ad1
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 or disposable domains, indicating a link farm designed to redirect users. Heuristics suggest it's a phishing or malware distribution attempt, with ClamAV specifically identifying it as 'Pdf.Phishing.Trojan'. The ML classifier also flagged it with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8544

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://driver-jazda.pl/upload/file/68172994390.pdf In PDF document text
    • http://www.como-grup.ro/fisiere/file/619091635.pdfIn PDF document text
    • http://neoneofytou.com/ckfinder/userfiles/files/kitibixanitixananexan.pdfIn PDF document text
    • https://cristalensi.com/public/File/razufadumewapofomal.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c06be9cc8fc---sadokevevof.pdfIn PDF document text
    • http://jfhconsultancy.nl/userfiles/files/zakekokiz.pdfIn PDF document text
    • http://ballstonfamilymedicine.com/clients/861402/File/xulanepejewefebetu.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/86789c6f75e7caee35138e6c48edd929/87882715117.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160f3fdb449e91---dugakujubezuluritokogovit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=2005+infiniti+g35+coupe+manual+for+salePDF link annotation

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