Malicious PDF — malware analysis report

Static analysis result for SHA-256 8daaaf944142e4b9…

MALICIOUS

PDF

78.3 KB Created: 2021-06-07 14:47:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3c52ef18c10abd09c8d5c124ab87f3ec SHA-1: 100eef4877d94cf5aa3fb536a3eddf1b92aae155 SHA-256: 8daaaf944142e4b93c144f778c247445a8adb37218c3b7efc31956e7ccc19804
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to harmful 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://krisoc.ru/uplcv?utm_term=fsa+ela+reading+practice+test+grade+5+answer+key
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccfea0071f---79498153246.pdf
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/3ee3e7b2291f56363d26bc3d0f14d832/migabisigewevowa.pdf
    • http://derma-dts.de/files/file/wesaf.pdf
    • https://agronlogistics.com/userfiles/files/2352550176.pdf
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/q6sba9cs90s3dr80kkrhndpus4/robati.pdf
    • http://tubietelbar.hu/uploadfile/999588884.pdf
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608078547d9a2---wokexa.pdf
    • http://adamlegal.com/userfiles/file/3882534286.pdf
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b49e5eb0f3d---21178251897.pdf
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/90c5aabe169decbb6ff584fe067a510b/27655726240.pdf
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160a16b7189704---wudixer.pdf
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/12b7b90acbf137b405aa4899acc70197/busoligimizakul.pdf
    • https://poolpoint.be/uploads/file/35293703868.pdf
    • http://msamerica.net/clients/873634/File/monowisepon.pdf
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/fffad099164edb45e3c337f13187f4e6/69854721409.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_off0000f5fb.bin
363c7c6468c7b7507a3cc0738332f64f4db719b02d07e53ecb34ccf327907147		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FB 5580 bytes
font_01_sfnt_off00010923.bin
170014e93b1d9d41f84d9997d31bd5cacac2d82e85cd3c9b245b155aac7a0905		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10923 10188 bytes

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