Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d3e786b17914c9f…

MALICIOUS

PDF

77.4 KB Created: 2021-06-25 01:09:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1a19e2a46751864c53a7008513399221 SHA-1: 1a8ef8ee3f0adea329a39946dc03167e4b545df8 SHA-256: 0d3e786b17914c9ff83c32a1b47aa526ba2e4c7e69f14e12c6b1fc3151ef7d53
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm or phishing lure. The document body is heavily obfuscated and contains metadata indicating it was generated by wkhtmltopdf, a tool often used to create PDFs from web content, further supporting the link farm hypothesis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16093caae99aad---zijumatalelof.pdf
    • http://utuin.net/files/fckeditor/file/50586133117.pdf
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/926f11d6c8732221cb0003e87d76b2af/20867657075.pdf
    • https://vicotelecom.vn/static/source/images/file/68621609630.pdf
    • https://syteq-pro.com/userfiles/file/23777692987.pdf
    • http://adams-gold.ru/archive/image/file/2969284955.pdf
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/ucoufgbead9ns8n84ntl8u5eh7/18981090658.pdf
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/086f3311c66dd2dc2043bdab7b50ff84/49575187708.pdf
    • http://ruilong-ironwork.com/CKEdit/upload/files/11563192465.pdf
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1608024486725f---46808021912.pdf
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/bca07eb7c780fcdc5fe8e5c40125314d/30900150591.pdf
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/vou3f2sfom7a8f43lm3l5c330n/29933903751.pdf
    • https://fcksa.com/ckfinder/userfiles/files/27139096256.pdf
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609801522c12b---siseluzafexowuzelufe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=clemente+atlas+of+anatomy+pdf
    • 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_off0000efb1.bin
6401f25662a517385ee97c1edaadd66eeab4b92e81dd3283e4798f523b38b02f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFB1 5096 bytes
font_01_sfnt_off00010100.bin
d8f6db594ae510c2b346a5bb071ea3833789f21e797acf0dda24266770837b4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10100 11316 bytes

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