Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b95f86619534895…

MALICIOUS

PDF

72.5 KB Created: 2021-06-23 13:27:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f56a80a0a8f92e8a296a5630597d8d72 SHA-1: 6dc61e7b4c1d59742a6244890e30f786690bf5c3 SHA-256: 4b95f86619534895897746e29136a4e064b896729148c191c1f226591b78e479
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure and embedded URLs point towards a common phishing or redirection tactic.

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 https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/ee3d3fcd2c160e5824f841aa25aa59cd/60744911742.pdf
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/79234e9ea731d7b2ff35c0cbd9c7b727/65278836291.pdf
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/tsb49lrhn6bo62q7duf2na5c7c/62230630533.pdf
    • https://travolution.travel/wp-content/plugins/super-forms/uploads/php/files/46468b75d32645c765cef991fc4367c5/soxelotalogizarisipigi.pdf
    • http://vervesimuhub.com/userfiles/file/98655235203.pdf
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1a0fbbade7---susure.pdf
    • https://cjsc.se/ckfinder/userfiles/files/61121175193.pdf
    • http://sbstroy53.ru/img/files/sofimudavirotedozug.pdf
    • http://hzbmsj.net/images/upload/File/26425051346.pdf
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/3753a542aa37fa4b9137e545e59437c6/6198407483.pdf
    • https://seeandhearbetter.ie/img/shop//contents/pimekinejafurupuf.pdf
    • http://aarogyamedico.com/userfiles/file/kajedogulumajixavipu.pdf
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160befabfbbf7f---latoli.pdf
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/t1bi6h20lrlqhg1ojcafpnqncg/10306091512.pdf
    • https://wulf-sanitaer.de/wp-content/plugins/super-forms/uploads/php/files/tvqatou5baf0dvd031pj8omo6q/rawek.pdf
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d5f5d999a---jonurapokunezusebugidaf.pdf
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a673962f72d---mebupunawafagovod.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a2c19ecd95---73513575297.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=30+cfr+250+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_off0000dd2a.bin
ea5660fb4b9c752aee5ac632857fd6b12d38df86688b86b07ce836bf7d2bc0d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD2A 5196 bytes
font_01_sfnt_off0000eef4.bin
c713490936909390e0d9636b3261d6b4aa62d9a4b053ca57fd747279ec05f3cd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF4 11300 bytes

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