Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b40ff0fb1f6e3b0…

MALICIOUS

PDF

81.0 KB Created: 2021-09-08 04:24:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4e259d761de2df6128845779b774bde1 SHA-1: e40542af747ae7b488fd72d8b7649279105b3386 SHA-256: 0b40ff0fb1f6e3b09e3a0f866dcf4cd6159289215b69eb3c7f60baa17a286f0b
156 Risk Score

Malware Insights

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

The file is a PDF containing multiple links to external websites, many of which are hosted on compromised or disposable domains. Heuristics indicate a link farm pattern, suggesting the PDF's primary purpose is to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://montgomery71.com/clients/34132/File/dikijanazol.pdf In PDF document text
    • https://samngaimarble.com/html_upload/file/91672317575.pdfIn PDF document text
    • https://sapporopools.com/contents//files/dibuxubadorumijupowojebig.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/25741775848.pdfIn PDF document text
    • https://ecole-anglais.com/upload/files/zakexojebazaremugibenof.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/penid.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/bidakotufujekefodivono.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/52190833259.pdfIn PDF document text
    • https://turkihale.com/userfiles/file/93564213546.pdfIn PDF document text
    • https://boucherienabli.com/uploads/FCK_files/file/burinexamaluru.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/1e8dab07e97c78017bf042fc4b7af29d/lutinaxefaxosemufi.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/f6248626b1f64c869c741fd3f6186dbd/48326142891.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160766ff0abf39---xujomuzi.pdfIn PDF document text
    • http://michellesmithscott.com/clients/36670/File/84056720016.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ff2d32cc30a---xosilazeb.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/s6rn56asbrtpgf4hk2a567vtpl/24363208999.pdfIn PDF document text
    • http://aisef.org/uploads/userfiles/file/file/33815876446.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612c1fe028d8b---basexorakifo.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/memuf.pdfIn PDF document text
    • https://triyoga-tv.ru/userfiles/file/tujib.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/zikovisitebizanawekonu.pdfIn PDF document text
    • https://bluza-shop.ru/content/File/givodawofinejusavig.pdfIn PDF document text
    • http://lammensfilip.be/uploads/files/13623260531.pdfIn PDF document text
    • https://mysmartedu.com/uploadimages/files/46767759684.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=nuance+power+pdf+standard+convert+to+wordPDF 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_off0000d748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD748 18136 bytes
SHA-256: 2bd12d835279dd5318611b9be0bb893e59efbfbc9b4765e61761c149693a081c
font_01_sfnt_off000105b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011dca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DCA 10704 bytes
SHA-256: d383305af516ff6a8bc8ba39bbb770c34a208f2378ba5a3110264f2849c65595

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