Malicious PDF — malware analysis report

Static analysis result for SHA-256 e491882e9a21ef3b…

MALICIOUS

PDF

87.0 KB Created: 2021-08-08 20:23:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d86b2565daf00129343351f1b1a4f737 SHA-1: 71538fd5112ad3b15eb3443e44b021558a6e1886 SHA-256: e491882e9a21ef3bdad54050bf49c43505a7973fe4fe82a90bd3e79c35e4fde8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm pointing to potentially compromised WordPress upload directories. Embedded JavaScript is present, suggesting an attempt to execute malicious code or redirect the user. The presence of numerous external URIs, many hosted on distinct domains, further supports the attack pattern of redirecting users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/1f02e7951dcb67758a2aa94d2d0a8f72/pakefofonajopajotukezex.pdf In PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/p250ae8kic1mcku97d9sgp5il5/tagisaneseweli.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/60756353834.pdfIn PDF document text
    • https://www.ventisilva.com.br/ckfinder/userfiles/files/xazozapali.pdfIn PDF document text
    • http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/papubakoluxoreboxidilasa.pdfIn PDF document text
    • http://gallery4walls.com/upload/editer/file/9106643118.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160880189f1c75---bipavefova.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16084792e78f46---susuweworosotepid.pdfIn PDF document text
    • http://anapharmata.hu/ckfinder/core/connector/php/files/xobul.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/86409378803.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/8353700187.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/u5fghpjafn821eo761qlmvjf4d/xadotelusodox.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/ae50s3ffa6gnv4jbgj2ktd333s/93121381766.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/bufajanevatikozibegenare.pdfIn PDF document text
    • http://kjphotocon.org/data/userfiles/files/74430106382.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160799479177a5---90359459874.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/walaxesu.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/rnh21r0s6ttmr0ja0plhuaa9e7/32884479064.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc47dee49e---gujebazumazasola.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/83522276573.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/5h60h4dn2r24t8grv38jgr57p7/99013327273.pdfIn PDF document text
    • https://ariaparvaz.com/basefile/ariaparvazcom/files/13037883268.pdfIn PDF document text
    • http://staropolski.net/Upload/file/soviloronupuzibomebera.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=2005+freightliner+m2+radio+wiring+diagramPDF 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_off0000eec4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC4 17552 bytes
SHA-256: 595d71de0925cd220acbed5b5b2fdbfa17ce97580090a5182cd413f5b99dfa86
font_01_sfnt_off00011c4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C4F 10996 bytes
SHA-256: dc5f0a229a324a54266e60fa02be1a82bc480c526d2cee78de7785d9d47ef665
font_02_sfnt_off0001358f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1358F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.