Malicious PDF — malware analysis report

Static analysis result for SHA-256 10855ef925f9db82…

MALICIOUS

PDF

76.7 KB Created: 2021-09-03 05:53:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: dde7557b6b430fc569f70a221144aef8 SHA-1: e019f9a55db0b5fd46adbdb178651b1dc7c4016d SHA-256: 10855ef925f9db820baed5b99923058e90b00f1d7a12714aa65b873f332e6459
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics indicate that the document is designed to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://cructi.ru/uplcv?utm_term=vaillant+ecotec+plus+937+user+manual PDF link annotation
    • http://maynenkhipuma.vn/quangbasanpham/app/webroot/upload/image/files/15645093588.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/81925300090a5288f7a5b785ced9741f/25658489262.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/jufagoguxa.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/22b044fc1694ffbab0ec7934768e1614/mazijivupuz.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/melopatidikifijavuxolajo.pdfIn PDF document text
    • http://geombiagioschettino.eu/userfiles/files/lakiluduwiloxedit.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc0f2e5a51---37164585263.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aade4bda629---41260404228.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/p87avs11jl5aq2dho4hk80e7bstdnrcr/livezarorotejomiliga.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-5-9/20210509215514409020.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/68d09f6752049ae8f52e50c664bed3f0/nisoranerepexewe.pdfIn PDF document text
    • http://goldia.cz/data/file/16087300033.pdfIn PDF document text
    • https://nhachoxebus.com/upload/fck/file/24023396217.pdfIn PDF document text
    • http://fairtradeportal.pl/userfiles/file/67944253105.pdfIn PDF document text
    • http://attlas.center/userfiles/file/sejetifekakuvodazopa.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/73780257044.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/3757754608.pdfIn PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/91037409335.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/8979f538c93eb32f554d8dec135764a6/mepoluna.pdfIn PDF document text
    • http://tsrmmessina.it/userfiles/files/xisokigowiwavobikodo.pdfIn PDF document text
    • https://pellevah.com/upload/files/dowusogopi.pdfIn PDF document text
    • https://elpollopaulino.com/cenavarra_userfiles/files/93596681163.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/584217a61b7486179eae8f47bb13708b/fujetotabejulazos.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_off0000c91e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC91E 10992 bytes
SHA-256: e882e5d7edd86b2f17d697658ed53a35c4a07e8efb94e03649d4050f26a29381
font_01_sfnt_off0000e2b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B7 16348 bytes
SHA-256: 1d8578460e1180ebc09f198c5e7b561f3dcaad33978bd4f712730b6366392b83
font_02_sfnt_off00010d14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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