Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9152ac47c66bb83…

MALICIOUS

PDF

81.5 KB Created: 2021-08-04 14:01:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e9495db3db86020d2a160412b166a09d SHA-1: 231902a77dd42eda428d27857bce7689650c6f3c SHA-256: a9152ac47c66bb83539a35b04436ca503007d44c5ca20f5a958dd8cdcf79445c
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The document contains numerous embedded URLs that point to compromised websites and link farms, suggesting an attempt to redirect users to malicious content. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports the conclusion that this document is part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

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://laborke.ru/uplcv?utm_term=calculus+2+pdf+jkuat PDF link annotation
    • https://cpsguffanti.com/uploads/file/10644750533.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16079b98d83924---108235896.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/jejuxe.pdfIn PDF document text
    • https://vidaleve.net/ckfinder/userfiles/files/xewomenot.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16107c1caa92f0---57048060136.pdfIn PDF document text
    • http://melly-incendie.fr/img_db/nikusebenapodus.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16090c85b3d7f3---48403709238.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/32026125721.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/birejifipuboduparuwum.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/367988107d30bb8f1e84556035b047d1/37769894800.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/jo79fjdgsi8i46phvh11o4v0t7/98080212915.pdfIn PDF document text
    • http://christmaslandint.com/userfiles/romuxawimuj.pdfIn PDF document text
    • http://embeddedhr.com/ckfinder/userfiles/files/68842368540.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1609789af31e62---pukevatilubazat.pdfIn PDF document text
    • https://dakhoathienhoa.net/images/files/25915853097.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e5bf26398---71533354050.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/96958024375.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/95868802854.pdfIn PDF document text
    • http://basaritarim.net/admin/editor_resim/file/22746572682.pdfIn PDF document text
    • http://neodentpetrosino.it/userfiles/files/wegizepiv.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607823e47c60c---69465202126.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/furodozefedumib.pdfIn PDF document text
    • https://wittnebel.dk/file/68900023767.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf57c2adbed---42067448698.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/57a087fd5f1a9d643f374596cda851ce/9613865064.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/84144e99dcd3ba604bb9ed27c950f642/88775077268.pdfIn PDF document text
    • https://securitegenerale.tn/userfiles/file/diloxepobobirujaja.pdfIn 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://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_off0000db7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB7A 16792 bytes
SHA-256: a9fbb0d4cd1d69b928e1643c838b66a341b253929af6e27d0c2af95d718d9bda
font_01_sfnt_off00010732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10732 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F49 10536 bytes
SHA-256: 932d6a449933fb6966b7bce834443e26e1153d3f8ba629665270fa0ffd844d11

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