Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f8adffb3bac9811…

MALICIOUS

PDF

67.0 KB Created: 2021-10-24 01:55:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9ee0c7da0d70941882c16a54d12827cb SHA-1: 527d9b546402389ec2e25ebb8080229a9b72432a SHA-256: 3f8adffb3bac981185d8e22f8991a833a2b3ae7e70c4f8cc659976790cefdd7c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier further support its malicious nature. The document body is heavily obfuscated and unreadable, preventing a more detailed analysis of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8303

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://rasciindia.com/firetech/ckupload/files/51547614351.pdf In PDF document text
    • http://juha.be/_files/file/sixixumu.pdfIn PDF document text
    • https://sowlindia.com/userfiles/file/tewanebakowap.pdfIn PDF document text
    • https://southernwashpros.com/nbloom/fckuploads/file/75359249474.pdfIn PDF document text
    • https://mttrasportisrl.it/dati/upload/file/79844727217.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16166597831903---lijerujilapuwivizeg.pdfIn PDF document text
    • https://samsunyapi.com/userfiles/files/rajidirekup.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/f342b0352f561b482003faa77bb385af/wuribibovata.pdfIn PDF document text
    • https://bozoklar.org/ckfinder/userfiles/files/41534125915.pdfIn PDF document text
    • http://www.kyousei-fukushi.or.jp/system/ckfinder/userfiles/files/60090283264.pdfIn PDF document text
    • http://autoscuolapezzano.it/userfiles/files/50660229909.pdfIn PDF document text
    • https://aczv.fr/userfiles/file/kigiwisufiwumero.pdfIn PDF document text
    • http://wdnederland.nl/file/xijodu.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613864a27aceb---15187875375.pdfIn PDF document text
    • http://westfield.qa/multimedia/userfiles/file/87117132462.pdfIn PDF document text
    • https://rawoctane.com/uploads/file/56202749525.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/2975007178.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/jijugegivajiweguzowopopu.pIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/HTGXzuRVGb4/uplcv?utm_term=autobiography+of+basheerPDF link annotation

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