Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d5fb018d79f8e7a…

MALICIOUS

PDF

72.5 KB Created: 2021-06-14 20:17:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 284d16f8b31a4105fe6ece3b2e564e4d SHA-1: 597a058652fc2dac6047e0e6ae2dddd32760b977 SHA-256: 7d5fb018d79f8e7a67f63b2b8e2acd1e9e99029ce32a763f4bd61c211ae8dbc0
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised WordPress sites, likely to trick users into downloading a malicious file disguised as a font. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs suggest a phishing or malware distribution campaign.

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://krisoc.ru/uplcv?utm_term=micr+font+download+windows+10
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/ngc01aaudkcabcrop2ec0v813g/18720353109.pdf
    • https://adreshosting.com/calisma2/files/uploads/gujimitakaxojifosugepu.pdf
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16082dbc0cbbbd---luraxurunipagikebakome.pdf
    • http://thegibbsfamilyreunion.com/clients/d/d9/d929505c7faf6263097cc97620c39d65/File/7145976478.pdf
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/2a4d1e551a9f0b581fcea69cfebd618e/89187886588.pdf
    • http://alexlunacoach.com/img/editor/file/zozopimefedazibefakijum.pdf
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/8vlf446eq85nglucjsnlkt4hch/34271829776.pdf
    • http://wrtour.com/FileData/ckfinder/files/20210611_6395E46E5FE7A79E.pdf
    • http://web68s.com/upload/files/bapozaduvijux.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/bc6f13a3d8c74411e8ac97322aa645fe/zeworu.pdf
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb4a9049e5a---rewujopamefovinazufobe.pdf
    • https://dcoderesearch.com/uploads/mejimasosabirodabirudagu.pdf
    • http://epoxidice.ro/mm/file/nirazowofusovewitof.pdf
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/16088bca14479e---46034299029.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090c4dd6d1c2---xolejokokejemubivo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000deb5.bin
1d9e461ed0e0eaf845b5dc7953988d2bf747ec54a0545eb45bed99047539b524		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB5 5308 bytes
font_01_sfnt_off0000f0f1.bin
2f8b50b97e53fb6d8cc06d683b40e354789f00b1e021afbc8c1cd4e45e54a8d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F1 10604 bytes

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