Malicious PDF — malware analysis report

Static analysis result for SHA-256 3278c6bf2f4029ff…

MALICIOUS

PDF

76.5 KB Created: 2021-05-19 12:29:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8ee0089459d75cf96c5ae1d493009103 SHA-1: 3ba03bac28840e48f7522a212a392229bdcf2afc SHA-256: 3278c6bf2f4029fff9953f3b0f6d53b1be17e867c9abe249253ba9330336532d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/d42e656e3411f5a1c00917aafbfe4429/5221278611.pdf
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/47a66b3c7b6126c210520eca75d997e0/xorurilisugatilamevuk.pdf
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1609b761b8060e---73809497675.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16074380e395a8---pajuluwanofixijevinonif.pdf
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/f244a92278e6a08401c81094e76c387d/74605052537.pdf
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087c68b64366---zudesojovav.pdf
    • https://grandplaza.bg/uploads/assets/file/timemawedevudevam.pdf
    • https://bancodevida.com/bancodevida/admin/images/image/file/lefagovozajaxatuxebetore.pdf
    • http://curry-box-deluxe.de/userfiles/file/63527253971.pdf
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed776509ff---19831916052.pdf
    • https://soudurelauziere.com/upload/editor/file/2889630716.pdf
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/1f1b320656069dad35e17b66657f7abe/wezelo.pdf
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/a003ede77c5bee4ee8f2190e0f58f190/65439122703.pdf
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160744925072b0---wegizemofirujosin.pdf
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609ef69a6ecda---nuluva.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16080e693c4214---jajewebub.pdf
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/e01ctj4pdle464lnasquaku3q6/gavediw.pdf
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e96528fc7---sukupapidedovi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=what+to+put+on+resume+for+server
    • 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://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e18b.bin
f01bbca1bc4c58dc3ee0167a18e9d01ab31fbe32cd1bb8bbcd93e587730c5553
pdf-font-stream PDF embedded font (sfnt) at offset 0xE18B 5016 bytes
font_01_sfnt_off0000f273.bin
c3929cd3fcce5f97a36910a5cfedd4668d19e04f634edb9f6809670c03aec4bb
pdf-font-stream PDF embedded font (sfnt) at offset 0xF273 10648 bytes
font_02_sfnt_off000116ba.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x116BA 4324 bytes