Malicious PDF — malware analysis report

Static analysis result for SHA-256 56038d06c080ec6d…

MALICIOUS

PDF

79.8 KB Created: 2021-06-11 11:57:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: c71d139a69ba8f00376949d5ba1c0961 SHA-1: a75e5d8a3dddad39bf0d121c0a51f231a129b6e6 SHA-256: 56038d06c080ec6de52a8e430130c37edecbcd76c0afb3d5ba84c8d6ee25a946
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution campaign. The embedded document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, which, combined with the numerous external links, points towards a lure for downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://synerhu.ru/uplcv?utm_term=the+time+traveler%2527s+wife+book+pdf PDF link annotation
    • http://matstravel.ru/userfiles/file/87614559699.pdfIn PDF document text
    • https://gloriouz.in/ckfinder/userfiles/files/96897627937.pdfIn PDF document text
    • http://hongshengfish.com/uploadfiles/20210516/210516105640325236r7btop22kglg.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/sitijozofimetamivajexin.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/40973171385.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/kufolejer.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b48141cc7b---5028441300.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b2baea7d1e6---soxajawuwuvakub.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d4e969168---17478031932.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/a3de76bff5d8e2d0ec6ded309809a464/11951036618.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/tunekanitiporuzofus.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160809ec303ca6---97730427053.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1d2a91134---guwekusuzolab.pdfIn PDF document text
    • http://wccflooring.com/userfiles/files/jevepudopitugonotumox.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f769.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF769 5620 bytes
SHA-256: 1b73deafad1bfd81efcec6269f90d777da88a5805be3705749a7ae66cbbca3b0
font_01_sfnt_off00010a73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A73 11748 bytes
SHA-256: 6fe3d49c991aed1c267bfc68b960c6f1e2f22d9acb1b86ec80a8b8fcb8a6d692

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