Malicious PDF — malware analysis report

Static analysis result for SHA-256 b03f0759a01c0082…

MALICIOUS

PDF

90.7 KB Created: 2021-08-01 00:20:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0a99611dd522009bc553b141424bf7af SHA-1: c3b6f885305f93c13a8fe05f21b8beac815c5b2e SHA-256: b03f0759a01c00821f114650ac8b0dd0194e25715bf23d2ae6ba7fe8f659d1dc
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, indicating malicious intent. It contains a link farm with numerous URLs pointing to compromised CMS upload directories and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of external URIs and the overall structure point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://allytemp.ru/uplcv?utm_term=do+snoring+mouthpieces+work+reddit PDF link annotation
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/dbd3c51e968f5cf6325a472432fd1e2f/30643215869.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/g8bt6hadj0g02i3vet6cmh6kj6/wasajatepin.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f082bf9fbb9---vutakupok.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7a4aae105---87522038961.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/36631062520.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/69657048753.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0f31f422b---60210458635.pdfIn PDF document text
    • http://hesexpo.com/img/editor/image/file/99820205937.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210723_BC618797845F7CAD.pdfIn PDF document text
    • http://haniltm.kr/upfiles/editor/files/64771410756.pdfIn PDF document text
    • http://cainghienbinhduong.com/uploads/userfiles/file/givipikew.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad299782f25---xekup.pdfIn PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/32439605499.pdfIn PDF document text
    • https://theloneranger.tv/clients/loneranger/ckfinder/userfiles/files/patojimojin.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/3ulglb0l60qhdtquags73q0jt1/zamogepigumexutid.pdfIn PDF document text
    • http://juicewarenhuis.nl/app/webroot/files/userfiles/files/kebogizigofuvo.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/4d41c81b293fff26d8a4f70f3dd04c37/rigukeparosimel.pdfIn PDF document text
    • https://infypos.com/infyposcms/media/wimulewudobow.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/kevewigavowaxiwilimi.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160922a36738ef---rovuxezatisewumewanite.pdfIn PDF document text
    • http://www.insight-assessment.com/ckfinder/userfiles/files/56239072189.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c9f796882ee---xunekolazewegavulupilu.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/59190444773.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_off0000fd3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11551 17540 bytes
SHA-256: 18ee8a87c22fb47d0e7c37d349456bde77c1f9b51b396b4b8401e28957837248
font_02_sfnt_off000142f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142F7 11032 bytes
SHA-256: 157a58dd098e3ab7a270d472d02988c5bc99263325398617ea312d465d375896

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