Malicious PDF — malware analysis report

Static analysis result for SHA-256 813401ff298a9c49…

MALICIOUS

PDF

83.7 KB Created: 2021-08-16 20:49:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ee0b856002bc6cdb1211cd1deca22eb5 SHA-1: dd55fc82c3bf94278bc85a67f28428759f270c9b SHA-256: 813401ff298a9c491a524830943ca446d1fd90e446a708f53d7d4c936b6473d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It functions as a link farm, with numerous embedded URLs pointing to various websites. Notably, several of these URLs lead to compromised CMS upload storage, suggesting a tactic to host malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://zulassungsservice4you.de/bilder/file/67838083799.pdf In PDF document text
    • http://maidichike.com/upload/files/duzolakolotejotexuwu.pdfIn PDF document text
    • http://cafemsoffice.com/userfiles/files/5607974730.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609854f71b7bc---fidubolazelig.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611778ab96229---71915028211.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/rouogp1r95gnrp6aefjg2v24t4/xikosokijabip.pdfIn PDF document text
    • http://beijingxinzhi.com/userfiles/file/20210630220338_1284822700.pdfIn PDF document text
    • http://tangiahoang.com/skinkorea/Images_upload/files/gaworinikezurelisibes.pdfIn PDF document text
    • https://kaptenhoki.net/contents//files/63568589534.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/af84c30c1151a086834eff5a27f1ac9c/nirewatigisezasos.pdfIn PDF document text
    • https://cooperspick.com/files/vemagorekixi.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b328350719b---kepajufawozazozivojiz.pdfIn PDF document text
    • https://sindhuinvestment.com/ckfinder/userfiles/files/93593368105.pdfIn PDF document text
    • http://sushi-belovo.ru/files/68629935706.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16098b3d9673ea---82345419914.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16093b21a52f48---ziwabotosave.pdfIn PDF document text
    • https://geniodelweb.com/file/jijemuvobofijunejibaxe.pdfIn PDF document text
    • http://twtipa.com/upfile/files/2021/07/19/80561709769.pdfIn PDF document text
    • http://thetestmag.com/userfiles/files/riberageb.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/ruzipurunezisad.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eff9e29a67---62434755190.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aafffd3124f---xatuvisubofepatobubovuto.pdfIn PDF document text
    • http://haniltm.kr/upfiles/editor/files/fixugejokuzubunexir.pdfIn PDF document text
    • http://janandpoos.com/clients/872640/File/damapusadelewozimo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=skyrim+changing+load+order+mid+gamePDF 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_off0000dd55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD55 19040 bytes
SHA-256: 1591fe8876021f89c8c6d36d69617b124c5c12d45866bbe691d80e81511c0c45
font_01_sfnt_off00010dec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12603 10832 bytes
SHA-256: 9b70ce276908b2d39e151bf888d29402f4e9fe8a9f25bbcebae87f612a49ff44

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