Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffaae9bad9957c8e…

MALICIOUS

PDF

91.0 KB Created: 2021-09-06 05:21:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a2a09b51bd856dddfe9d88bfb14d8784 SHA-1: 84d8200554fab94aa5c64b8084a652cfd02acc99 SHA-256: ffaae9bad9957c8ecc28a68a380b9fdb58db1c1d2e79a8bc4fef4269758a5103
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically a phishing trojan. While no scripts were explicitly extracted, the nature of link farms often involves JavaScript to facilitate redirects or obfuscate malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://infrive.ru/uplcv?utm_term=delonghi+esam+4200+service+manual PDF link annotation
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/45643422a19af8f9cee8fe6a0af7c82c/kebajoboxulepajubusu.pdfIn PDF document text
    • https://coevent.ru/upload/files/xutotewujulawolawemuj.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/59a4f150da4c65faaf727056533f6913/64822581658.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/a62852e78dfaa9db09b89e0bcbdb25c6/89199146938.pdfIn PDF document text
    • http://gilendor.cz/userfiles/file/kuvorefavusirixadag.pdfIn PDF document text
    • https://proia.bg/userfiles/file/milafonedaxuxagifef.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/33209599284.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/140928555310.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/17043451508.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/6e1mcb0jl34onugmma755vp3l0/25630412800.pdfIn PDF document text
    • https://thingstodobahrain.net/ckfinder/userfiles/files/panigalobasuliligujedus.pdfIn PDF document text
    • http://okuninka-biale.pl/userfiles/file/fezakijuzizaf.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/a60ad3f57927ae408f5d256a89a9eee1/raxemuladajosofugavo.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b87a636b236---zuter.pdfIn PDF document text
    • http://vetcasatenovo.it/userfiles/files/zakomiwewitubi.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/44575631137.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d21095ba578---vebosaru.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/mifolimotupetazaweselu.pdfIn PDF document text
    • https://unitedfightalliance.com/ckfinder/userfiles/files/bavepujijokefasaxemuxon.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606f18583fc34---81719581343.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/kekobizu.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/2gik594272bio8umit5c397qku/nagopubonomubopalozobujoz.pdfIn PDF document text
    • http://anapro.com/ckfinder/userfiles/files/gapaki.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_off0000f3fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C14 11068 bytes
SHA-256: 3456c723c8743c5f1e757b8bcf58f3e4777ba82e453c703ee6ed85885eaa6a5e
font_02_sfnt_off000125bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125BD 21464 bytes
SHA-256: 3226907f6d47e9d296a9e65d2746a8f46d6fe8c9d4f6503ae18bda0a7f7df5e8

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