Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd6eaae9f09114ce…

MALICIOUS

PDF

77.0 KB Created: 2021-07-17 06:02:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 333e070268e6236c4df08f7cd3365fab SHA-1: 81b4ba59f1cfdc4a00b612d1eafffa7915cd8c89 SHA-256: bd6eaae9f09114cea33f1061d5edf70cb232577f0cd2bfebcb87a66d31a1480b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites. These sites, in turn, host further PDF files, suggesting a multi-stage redirection or download chain designed to obscure the ultimate malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ebefd6081---62233527644.pdf In PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/n1ciophpun43k8tqj6il2t0via/81398990064.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd39c7dc527---86572329595.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160943a36dbd06---legisiga.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/e2e6498ac82475534eedf37ceaeeeb06/29118426924.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/u69mbdcs66o519u43m0mo82v22/lareno.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/74634461640.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/7948a1b49510c73b94d292e7d6f0adce/fapaxupojapofisubexogini.pdfIn PDF document text
    • http://akwarella.pl/user_uploads/file/10615715947.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/zidugedezuvanuvu.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/50bdcf3f02e275d990ca4c5477d05336/98299407673.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609304c6eab6d---ripenope.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a8bc3054f2b---13924521669.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160edf593ca9be---29024627121.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/saxoxelekixodovevugoke.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606fddf813230---65965083286.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160854c877c47f---27977441658.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160ce2122349a8---12124028274.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=cohesive+devices+tagalogPDF 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_off0000cc83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC83 10540 bytes
SHA-256: 869c1399ec20c2a4cdaa3fc047f883de7071832f5a48452652201ab96e5b967e
font_01_sfnt_off0000e490.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE490 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fca2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA2 16524 bytes
SHA-256: 76e6f9e67595a2ae92de8614c0c28c775ede3aaa407e22a6ed08a132474c6e80

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