Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a31265b703a8eb2…

MALICIOUS

PDF

80.0 KB Created: 2021-07-06 00:58:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2429a012fa8c9779f59f19d37890cc44 SHA-1: c3530abd0df478628b3a66ef879a05d8b78e3410 SHA-256: 2a31265b703a8eb201f7ef6744c41b0eab9e37d723668049ce79e880fd3a3ddd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links pointing to compromised WordPress sites and other disposable hosting, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and numerous external links are characteristic of a phishing lure or a downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://drafthe.ru/uplcv?utm_term=dressage+test+intro+b+walk+and+trot
    • https://secolink.sk/userfiles/file/32056982120.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/p8n0ahibni5ee7kj2958au8o0a/19667398064.pdf
    • https://a2designbg.com/userfiles/file/ferinetip.pdf
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/0294c695cba5e3cd563f07c83eafb8b1/3511077112.pdf
    • https://tavio.ru/files/file/polobiwugunek.pdf
    • http://amoy-art.com/Upload/file/97942738566.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083640a1d119---miperesazubabimobezebesap.pdf
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160855e786eb6f---13088887344.pdf
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/212f0260013a85988176ac762a04779f/77803953.pdf
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/52cefda7c7870cc06512dba3a82284b6/23472876403.pdf
    • http://hotstamping.pl/files/file/panazuvisow.pdf
    • http://griswoldremgmt.com/uploads/files/32175048880.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b6277b320---45313186777.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097dada8fb4e---vefuvewonot.pdf
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/6tph46muo55qnj4fut54gol4r3/zumovujijagerelajaki.pdf
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d76cdf8d7d4---lameredapudeguxiraxi.pdf
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ae43f3d8e79---58849312196.pdf
    • https://apz-arte.com/ckfinder/userfiles/files/27702804116.pdf
    • http://adaviestransportltd.com/userfiles/file/43675470907.pdf
    • http://zamokugrofa.sk/admin/fckeditor/file/81145389336.pdf
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9bfd0634d6---48926065261.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/3fd5fa255c2426871fbd7070b1229b06/wopelilirozuruda.pdf
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/03712eba153327d1304c4cc9769b43d8/kufojomimasizowomujupa.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://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_off0000d730.bin
5fc0916889e0a5059b4c8a454d5a31ab24a9dd2665e80c1e4f5989c8f73b5474
pdf-font-stream PDF embedded font (sfnt) at offset 0xD730 15960 bytes
font_01_sfnt_off0001006c.bin
ecbeee3d258393667080d59a3a57cc245be563df23b605dc5e5b40c42d90f12a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1006C 10740 bytes
font_02_sfnt_off00011916.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11916 16792 bytes