Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6cdc675fdede30c…

MALICIOUS

PDF

73.6 KB Created: 2021-06-12 18:03:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 92c29f275cb4c146b6717b0c403a41a6 SHA-1: e65b21ef42e0ac7ad6650c3f5f99abeddb8f26fc SHA-256: a6cdc675fdede30c30acb38a32c8ca7d67b83b5710eb5bf3e6acef926cb0c542
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. It contains numerous links to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content, likely for downloading further payloads. The presence of external URIs and compromised CMS upload links points to a coordinated effort to distribute malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8403

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://krisoc.ru/uplcv?utm_term=ppt+slide+template+free+download PDF link annotation
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/3da96881f05766ea9374391d9ac73dcb/tuvovobaduxulok.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/65da65e49b6c700fac5b63db35fbee72/54845755118.pdfIn PDF document text
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/bebc3d79bd108eaf350bf23ff943d441/wuzasexexagibaru.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bee4eb4c7da---35730033360.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160877f6e2ebdb---niporil.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/73292092542.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/57bb5ba4b8fa9fc150dbe575b11ccc39/14198618581.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/58589469182.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/a4acdc4b3e808c3c7a0aeaa90330beac/3581010133.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160989169f2ef6---63723603152.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160995843534a2---74265351790.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/93638063312.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b9295c5978---12489787499.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a57960494ad---pukamasigujuluriz.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/85843791890.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8745dbb88b---rixorixetukiresogim.pdfIn PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/26731021220.pdfIn PDF document text

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