Malicious PDF — malware analysis report

Static analysis result for SHA-256 80b3ba934e5dae20…

MALICIOUS

PDF

90.8 KB Created: 2021-06-28 10:33:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e769f522e989427a24d4761b16d5415c SHA-1: 329c50d329ce3112da4d7e02119975dddef6c60a SHA-256: 80b3ba934e5dae20504c52438693862604466804f1831653c69698db33bdeca6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and link farm behavior are indicative of a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/10heb8vadlnpkoj94hbcbap9oq/67823447486.pdf
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082ada7ee235---murosi.pdf
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/73191978258.pdf
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/lekonelogun.pdf
    • http://am-assets.com/aom/magnolia/userfiles/file/rufowatedaropelewu.pdf
    • http://stillwaterponies83.com/clients/74660/File/51555060959.pdf
    • https://electrabicycles.pl/app/webroot/uploads/file/16211480080098.pdf
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/112f86126154affc09cc7f2795e8afc9/nusajobenegidamuni.pdf
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/30dc15a79a089192545fa79dc02ae015/79662102254.pdf
    • https://www.saammohaseb.ir/wp-content/plugins/super-forms/uploads/php/files/9133c871e9a1c23fe2561b69b7f2fe89/rawebokexakudibigutu.pdf
    • http://playbabydoll.com/userfiles/file/gator.pdf
    • http://softwarefactory.nl/images/file/51499527773.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608f107fe4b0b---91956079493.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089a099c55a8---jetovamud.pdf
    • http://polyacer-ecp.com/userfiles/files/20210621_085047.pdf
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af7d69cf678---71178335668.pdf
    • http://kururlaub-ungarn.de/bilder/files/gojugito.pdf
    • http://vetcarefoundation.org/userfiles/file/nazemaja.pdf
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608859592f846---fojizaxukimemuwajut.pdf
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/t7pa3hcfc3j59b0t1rfuc0289l/tikefofibikaminazorolun.pdf
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad8c59b6c0b---refam.pdf
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/d98c90f266470f09810aeaa0cea33d5d/63329842901.pdf
    • http://oilandgaswork.com/userfiles/file/37534268909.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=what+is+a+volt
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076139854797---75680318602.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb3e.bin
34c86743bbfe7fea68a41ba15b3d2db87112f41f9ab39909cae7600c2150e7a0
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3E 17652 bytes
font_01_sfnt_off000119c8.bin
91c8f04c8f2c301d13acf4ac28f7bcebb8e9d2af98edeb1157abbe219210f03b
pdf-font-stream PDF embedded font (sfnt) at offset 0x119C8 9928 bytes
font_02_sfnt_off00012fe2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12FE2 16792 bytes
font_03_sfnt_off000147f3.bin
c74879eb49c01675629a1780d6c56244664560bac07a6b78f0ad4f8d59e4cc61
pdf-font-stream PDF embedded font (sfnt) at offset 0x147F3 16252 bytes