Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9c4b045b1aac90a…

MALICIOUS

PDF

106.7 KB Created: 2021-06-25 18:32:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2e641fc35c7df54dcca24c32e881692f SHA-1: a8b97f87db6c83d68699773ceefb8b6d53a2e8dc SHA-256: d9c4b045b1aac90adb079ff3b07d39b37c0fb8e800142f011eafb247acaf914d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to phishing or malware delivery sites. The presence of embedded URLs and the nature of the heuristics strongly suggest this document is part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9867

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://strategieb2b.com/userfiles/file/50468215271.pdf
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160853e29850ff---86273554654.pdf
    • https://coevent.ru/upload/files/21970957658.pdf
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16090890dcb651---63255313213.pdf
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160888d5c46022---77022024216.pdf
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160abf570e314d---gepupaxutewekaf.pdf
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/83c3cc438b3c07652a05493df37a8727/36827481452.pdf
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/9028d9d79e102c56c9545e3779f38ca0/ponezoterufakiki.pdf
    • http://oreade-breche.fr/userfiles/file/motomijawagamumidadix.pdf
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071b62689981---fuzijoxijoj.pdf
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/d83a4c8117ee462d99eee9a2b3661c0e/logon.pdf
    • http://asesorgubernamental.com/images/file/42967725051.pdf
    • http://cassotech.nl/site/data/ws/files/dodesinuramo.pdf
    • https://icbacademy.com/upload/files/86129802915.pdf
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/f6a65444d48ed4898fd2235535b628e1/41130826094.pdf
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160708ce356cef---16213029910.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160833294a484d---55774097313.pdf
    • http://uppercanadatwocylinderclub.com/clients/877835/File/puzago.pdf
    • http://jarosi.hu/files/file/jekupemuxukalukif.pdf
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7dcd5c878e---1614348506.pdf
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607016bc2f929---11524486441.pdf
    • http://igabana.com/upfolder/e/files/20210614075842.pdf
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b3bc2038288---jidukuwogafewabafonojaj.pdf
    • http://weberstellen.ch/userfiles/file/zililizekotizor.pdf
    • http://uzmansporzeminkaplama.com/resimler/files/kajozazi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=chinese+monks+martial+arts
    • 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_off000104a6.bin
f01d3b5dd1536eb63152d7b509252a9d623a5b437bc012e2552facec931cbc8a
pdf-font-stream PDF embedded font (sfnt) at offset 0x104A6 10496 bytes
font_01_sfnt_off00011c4e.bin
dc563c022cf0aae6c9630f8faa4687facbee224be58949899a777065651b1b2c
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C4E 19872 bytes
font_02_sfnt_off00015514.bin
7261bfc005486e3c12153de8f57cdaabd9ddb68b7a24bbd4e5e81961d937bfcb
pdf-font-stream PDF embedded font (sfnt) at offset 0x15514 19688 bytes
font_03_sfnt_off00018513.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x18513 16792 bytes