Malicious PDF — malware analysis report

Static analysis result for SHA-256 d36bfd75b79b8adb…

MALICIOUS

PDF

77.3 KB Created: 2021-06-25 15:22:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c1da701359af06f0e772b8e1a910a8b6 SHA-1: 3ac6258717fb53a3cf7fae8abcea09a345242999 SHA-256: d36bfd75b79b8adbf7caa33f704111c786cdadf4581efff143c75a2af38bf51f
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab894754cfb---4391620082.pdf
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/jolit7ab8hjuhup3fs2ldmc2ip/gibugolepagadizevamozo.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d176bdaa75---16445231106.pdf
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/1c2fcdb44554ff112ee51472e7530060/69785171627.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160833bc90df88---buwutuzedovisuvu.pdf
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/6c669e6fa69dc5b385a3db2eb3c1115f/xotomomiwilabi.pdf
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/heu4rjd1d05l2ge4cstd5dk4aq/sazolotuwusosuron.pdf
    • http://all-pass.com/folder/editor/file/vesaboburitima.pdf
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/6db32ac9d1783b0f4bdcf597031a3ee0/verabobesidefix.pdf
    • https://andrejc.si/files/file/lululorejutulo.pdf
    • http://slp72.com/clients/7/7b/7b902bee17765b19ebdde6030f24742d/File/lowotazav.pdf
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b1d9b8d0196---worab.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079529959700---merudugajujoburuwedibu.pdf
    • http://teormech.ru/teormech/usrimg/file/nipigifubibilajemov.pdf
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/6c6ab15036f5b881dd0403c92c36caaa/3677907640.pdf
    • http://provia-events.de/pics/fotos/1/file/xidadepigaxekel.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=exercise+on+past+perfect+simple
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb0a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB0A 16792 bytes
font_01_sfnt_off0000e31c.bin
2413e1281a7c43a1d4e7397f2af032df0732ec90d92330bc3aaf86416b5cb26a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE31C 16588 bytes
font_02_sfnt_off00010e34.bin
42aa33b11b2b67d2f293e8e29b442535453c1d828d8d9ca59c78e4b2cf9bf504		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E34 10724 bytes

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