Malicious PDF — malware analysis report

Static analysis result for SHA-256 42f240507f59e824…

MALICIOUS

PDF

100.3 KB Created: 2021-06-03 04:11:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: a77304a4a2b2d54f0ec1d34b4d317eb4 SHA-1: 09a7a7459fd2c01b042569b50a589991e362ceea SHA-256: 42f240507f59e824df41d6f29fd2d3aa8e7796b3ae648596e336212eb7836b6b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicative of a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The document body, though partially corrupted, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://crysiq.ru/uplcv?utm_term=wjec+economics+revision+guide+for+a-level+year+1+and+as PDF link annotation
    • https://stallion-international.com/userfiles/file/texonu.pdfIn PDF document text
    • http://instandee.com/Images_upload/files/55448210773.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/16df75fa3810efca5bb6633f09c87552/fazolawexifokofenik.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe0333721e---xefowi.pdfIn PDF document text
    • http://otvorene-srdce.sk/userfiles/file/javadibowipibodakusisegi.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607db4ba4847b---11632614737.pdfIn PDF document text
    • http://szkolka-wiercioch.pl/files/file/56466818728.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/fe580322f0a5967d534b7ea77aa2ad73/14340706755.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b81c7512fce---gebesabozukib.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/hscjmcvueb2sbb92p6trs9tj45/30117354967.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/dukamexuxewevolog.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/aeb24d7cf02ed0f4b38c4eb79d554afb/popuge.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/055f683db6a3c7bf8ca3dbe3e1d4e3c6/82136439016.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/43606427806.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014a60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A60 5676 bytes
SHA-256: 180ad78538b9caca0d75efd88209e615636989c0a95b692937a038a4f964a842
font_01_sfnt_off00015dc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15DC2 11124 bytes
SHA-256: d9e8766ce08132214d2c458fa9a021b5f1548b44acd731601e3cefe28802f01a

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