Malicious PDF — malware analysis report

Static analysis result for SHA-256 69b6f227ec4b503e…

MALICIOUS

PDF

104.9 KB Created: 2021-06-14 00:44:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: d733dc2ee3f775b8ecff39ac16f681f4 SHA-1: a8c6970999a96327e764a5369f5cdb39299ed1b1 SHA-256: 69b6f227ec4b503ed8d547b835788119b2c297ca0bb06d6f91f0aa53dd44130d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://crewmak.ru/uplcv?utm_term=clubbed+to+death+piano+pdf PDF link annotation
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/130cfb045763de1f5763c4577b5c3a3e/lobulosalegovu.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/jqb8b78cplviqg1qvmi2r4ogq6/wojuxa.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/ii1b39ka8nrrad9pd4bof4b2ub/82818142445.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160832c344694a---wafutikomemedinolis.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/96457284021.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160704d8624a79---piriluxenapogug.pdfIn PDF document text
    • http://stasta.com/userfiles/file/98540176766.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/9cabb1af2f0b0f58814cdcb0b5bb2731/40917512769.pdfIn PDF document text
    • https://homini.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16085e2face839---votijozufupiripusu.pdfIn PDF document text
    • https://euroroma-bg.org/files/file/bibofisuzuxagerivamuf.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f9f6e5a4a---34945516815.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160821f6f654f1---zitupebijapebosagejigo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.fontrix.comhttp://www.nhncorp.comIn 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000142d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142D4 4900 bytes
SHA-256: a551a92f273b2125b5da1f8f83ada87184401bd7dd63d7699dcf7e7bfed044a4
font_01_sfnt_off00015370.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15370 3104 bytes
SHA-256: e192432f227b35557a71a53020c03a9552abc74b5baf829ccce98ecf68414411
font_02_sfnt_off0001608f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1608F 11420 bytes
SHA-256: 2752b5dd1fd701fd86a2d4ad851b305eb1bcf891d59cac9f49d9b25dee44667b
font_03_sfnt_off000187ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x187AC 4268 bytes
SHA-256: aca69bc035f7c37b964c9a5147a30cf64a0b688e96bec438739b1c7d5c8ee7a3