Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6c6b7761617d166…

MALICIOUS

PDF

84.0 KB Created: 2021-05-27 15:09:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 2b596bb42576e5045bcbe4b22feb20e2 SHA-1: 9fe86af0758f9bf118a99640c96219b32b98c06e SHA-256: b6c6b7761617d166df9177f5a7a07ebfc2f9307f669fd4d3f5293564c3d062d0
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document body, though heavily obfuscated, suggests a lure for a 'free comptia security study guide', which is a common pretext for phishing or malware distribution. The presence of numerous links pointing to compromised CMS uploads and disposable hosting further supports this, as these are typical tactics for hosting and distributing malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5875

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://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/7ba3efacacd0f3899ecaa0a19aea25ab/nilemef.pdf In PDF document text
    • http://a-kamen.com/userfiles/file/badiladalipagijiti.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/mavepuxedekegav.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a09304018f0---5852120266.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097b999a21b0---31846775336.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/da15d4195bf6d4e25e863e074d7a173d/17081487842.pdfIn PDF document text
    • http://boothbayharborshipyard.com/userfiles/file/48308801857.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/gabusabulubusemenivimazu.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/oce2f0ij8c6mm9sdjkqjidsmil/gusosafekovowasewunasu.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084ded377625---67517400389.pdfIn PDF document text
    • http://allasclub.com/campannas/file/20999087002.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609475cad03b9---66415887026.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=free+comptia+security%252B+study+guide+exam+sy0-501+pdfPDF link annotation

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