Malicious PDF — malware analysis report

Static analysis result for SHA-256 889cfab33fe3b267…

MALICIOUS

PDF

58.2 KB Created: 2021-08-23 15:32:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5a568ad395d5d24c23f511d8c01b18cf SHA-1: d52bd421b5355c9a149e397f9a9b42e477c94b89 SHA-256: 889cfab33fe3b267658d6b485bb9c2d96b832aa5451d1a1a65099ecc99ed2a30
124 Risk Score

Malware Insights

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

The file is detected as a PDF phishing trojan by ClamAV. Static analysis reveals it functions as a link farm, with multiple URLs pointing to compromised WordPress upload directories. These links likely lead to further malicious content or phishing pages, aiming to trick users into downloading additional malware or divulging sensitive information.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4518

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://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/4b2f3f6a8ec8e7fd140e034d22c4633c/sidikuzofavulijosa.pdf In PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072cc0be59fb---sogogoweboxaketanesopawo.pdfIn PDF document text
    • https://thingstodobahrain.net/ckfinder/userfiles/files/26850133435.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607acf99e9c8c---61688251922.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/13918131100.pdfIn PDF document text
    • http://nowator-zpu.pl/userfiles/file/fiwemovalopiwuwaxifalig.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/d6b2553b4a08d3a3a84426f271244ef6/mipukapefinironavemasa.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/f79df9213005e71fcddcb1981365cc3a/72601769506.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/b60f737b45e210c9eee24e25ce841aae/27042533844.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=another+word+for+to+no+availPDF link annotation

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