Malicious PDF — malware analysis report

Static analysis result for SHA-256 5951856ab83f889d…

MALICIOUS

PDF

86.7 KB Created: 2021-08-26 01:19:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 5d9529d5b0175d4da7188f061c15b43f SHA-1: 06becd560bbfc48e33afc865dfa5fa165fe91848 SHA-256: 5951856ab83f889ddfd5b2c27c2b98113146c0778f720316fa5ba961a27bfadf
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. It functions as a link farm, containing numerous URLs that point to various websites, including those hosted on compromised WordPress installations. The presence of these links suggests an attempt to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://stl-hk.net/userfiles/fililumibarazunenatoru.pdf In PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077c4724f5e7---46664510257.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/88641600718.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c43502a9676---belinuzinujobuwe.pdfIn PDF document text
    • http://xhzhengli.com/upload/65705445446.pdfIn PDF document text
    • http://transgusto.ch/userfiles/file/92614612478.pdfIn PDF document text
    • https://orldoc.ch/wp-content/plugins/super-forms/uploads/php/files/dt26u4l2rdbv5gnl15ibjm8785/78047649788.pdfIn PDF document text
    • http://bougerpourstarlight.org/clients/c/c6/c668404594a1c08d975ab50c7bec58f6/File/67794094405.pdfIn PDF document text
    • http://aapltd.net/userfiles/file/jomametusobodidil.pdfIn PDF document text
    • http://thaicockstar.com/ckfinder/userfiles/files/fipurugu.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/jolew.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/vumagedatomelezonolovufu.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/4c140f589b8d29f75504fad2204042d9/15262191673.pdfIn PDF document text
    • https://elminhaj.org/userfiles/file/josejizagemege.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160e0e9093234b---50882236648.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16074111758808---58331558823.pdfIn PDF document text
    • http://dkmmotor.com/files/userfiles/file/10206237354.pdfIn PDF document text
    • http://lsbwg.com/ckfinder/userfiles/files/20210725/0125253000.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/l7qqo47v741k9bt13e0rg0u720/32924138046.pdfIn PDF document text
    • http://johnsonsdynastyincfamilyassociation.com/clients/10108/File/ridolaferuxetuvotimusemo.pdfIn PDF document text
    • https://lanna-flyingclub.com/ckfinder/userfiles/files/jakapokowof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=each+other+vs+one+another+grammarPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE73 17424 bytes
SHA-256: 8b31d6ea0cf939bfb458bec6c46a0f48b81467e2bc7c17a97f063e9c10be65ae
font_01_sfnt_off00011c21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C21 10588 bytes
SHA-256: feb06ab327f653f07d80e892e4c5db20cfbc06ab33a2ee60a84b3c85f0be97bd
font_02_sfnt_off00013438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13438 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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