Malicious PDF — malware analysis report

Static analysis result for SHA-256 32c7090f3e466d73…

MALICIOUS

PDF

80.0 KB Created: 2021-08-18 20:26:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a3dde1f67583d0fa4b43cb50c3247f83 SHA-1: ea2c46ef216b88e5557737363da60617ff2a2e31 SHA-256: 32c7090f3e466d737e58c2fd77dabe5478fcdd75002f7a6aa6616a6d4279fec1
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The 'wkhtmltopdf' authoring application and the nature of the URLs indicate a potential phishing lure or a distribution point for further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://bcm.es/files/galeria/files/bewuxopuvixezemewunaj.pdf In PDF document text
    • http://gdgom.com/upload/file/210628165727655876371uw7zpjewb.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/98430936036.pdfIn PDF document text
    • http://mea-travel.pl/userfiles/file/wutevuzorirakapamumogoku.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/15158003802.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/5929d058b86253acd28219deba996818/dizewevixavitevolusazu.pdfIn PDF document text
    • http://utpcomp.ru/uploads/files/68087140368.pdfIn PDF document text
    • http://travelport.pl/userfiles//file/17080748840.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/ml44prkd0j7l7ge56j8gfgdaps/milowisovowoxufum.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/8097047e0e2144a9472470e0708db666/guxafezujunomu.pdfIn PDF document text
    • https://cristalensi.com/public/File/tazifusivoxegufosotitaj.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16074815b2e910---70934785339.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/2f15ac612f78f0c0f58af9a9ac0ce3f2/17904500763.pdfIn PDF document text
    • https://betenrealestate.com/sites/default/files/file/satanopitapipuviv.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/zirukowedikozenozurajogo.pdfIn PDF document text
    • http://blankheich.de/images/uploads/file/kojonivufakab.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160d92214e9bff---sabigurezoxap.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16107f8aca879b---lasopu.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5d6f01037---23542297799.pdfIn PDF document text
    • https://www.fangjin.org/ckfinder/userfiles/files/33061381377.pdfIn PDF document text
    • http://sostrevalli.it/userfiles/files/82501862425.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/45f2736e44ddef6844bf7b0bef9da4ff/musijogulufekowijam.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///91804046890.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16079af7aececc---guruv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=cinlerin+esrar%C4%B1+pdf+indirPDF 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_off0000d334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD334 10352 bytes
SHA-256: 40dba5b002826f76e6167ec101453fc967e214f97568eaaf60da0f489ef68b4f
font_01_sfnt_off0000ea96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000102a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A8 19100 bytes
SHA-256: 3ee57fb755de1424b0c21443a7087c44b78c16b590e8b911a1a66d7223a0085b