Malicious PDF — malware analysis report

Static analysis result for SHA-256 85296f41e0c76fd7…

MALICIOUS

PDF

80.1 KB Created: 2021-09-07 14:08:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ae4675a35ef85701ba8cd6f39d3f785a SHA-1: 2c6154d6557ae28b3f3b71f15c4fb368f951ad2b SHA-256: 85296f41e0c76fd7434531ccf0e90ee8bbf8f6e2c1e4b4bddc168cd9ace670fe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by multiple heuristics as containing a link farm, with several URLs pointing to compromised CMS uploads or disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The presence of numerous links suggests an attempt to lure users to external malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://cl-metalparts.com/d/files/29959789580.pdf In PDF document text
    • http://dastone.ru/userfiles/file/92165472211.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/4445074861.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/5941c0297419b590279323f740c16a3b/bedetasododas.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f8e13f0a0---rateloramobisaxezu.pdfIn PDF document text
    • http://palirna-frydek.cz/uploaded/file/65418654749.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608f72d3d5e57---ravirubenezusutuze.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/6e671baf24a2c72c4ed980d42b211fae/livusofonumixuxe.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160706a8163bf0---54298289147.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/bmph7vp9fcv8b68ait8jpg8dfu/pejizagafufopovujapadogez.pdfIn PDF document text
    • https://bahamianbrewery.com/ckfinder/userfiles/files/83894252013.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/foremudafa.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/72757115664.pdfIn PDF document text
    • http://belovosushi.ru/files/zetuvaxogopuzowa.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/b31b5e4a156568a863c77f2db3f143ab/22296756073.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d1ac8da87cd---linasobirefatelusilijun.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6fecbb65c9---51884279766.pdfIn PDF document text
    • https://biocoils.com/img/file/pibedexubigifuwaxilif.pdfIn PDF document text
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/2e5ec932f5da95111689ea1293237f67/31772629746.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/gelanobezipo.pdfIn PDF document text
    • https://machinex-machines.com/UserFiles/File/1122529396.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/43797560111.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7484e3cd55---74837931989.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=shin+kanzen+master+n2+grammar+pdfPDF 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_off0000cffb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFFB 18652 bytes
SHA-256: cce67d507de70b86044ddb01e78e31f5b411465c3b60501e45eea7a41bcb83d0
font_01_sfnt_off000100c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100C2 11124 bytes
SHA-256: d1d5df3ec9bc2ba2d2f0d60cf3949783488297afc77e035bfcdcfc6f4e8ee8be
font_02_sfnt_off00011a69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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