Malicious PDF — malware analysis report

Static analysis result for SHA-256 db07f5ae0b31a7ef…

MALICIOUS

PDF

82.9 KB Created: 2021-07-08 00:47:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3221e87b968baf5796abf77180cea2a0 SHA-1: d24772c0d5a0c2cbb28fc00da5839e76a1db249f SHA-256: db07f5ae0b31a7ef5704ae24a7aba4a7fa75390268f87aaca5b10344e0a7ee8d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish or redirect users to malware. The document body is unreadable, but the heuristics and URLs confirm a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/2a92581259c680356273d2eb535bcf96/kikaxokigopulajoxexug.pdf
    • http://myboydfamily.com/clients/7/7f/7f513a2250c12de81a70a6735749c289/File/68842501972.pdf
    • http://hillsdale66ersreunion.com/clients/c/c6/c679c52642bc64dd8629b98fb95ccc77/File/kakakavomet.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a4944084439---raniduwenemunigamoxifal.pdf
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1609ff9e846773---jupux.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079448c0fbbe---42819844726.pdf
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/e3365fa08be156396eec0760fd2da80b/89492373225.pdf
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160831a8121eec---dorofilafesedajuzalezi.pdf
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/n89b07hj1buamvv1atb4tin949/7396224276.pdf
    • http://unipsyclinic.com/userfiles/file/20210513185422.pdf
    • http://www.toeterloeh44.de/files/73218375570.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3f86a1159---gudonuwunetagid.pdf
    • https://chandrakantmusicacademy.org/ckfinder/userfiles/files/paxuwija.pdf
    • https://rajaketiga.com/contents//files/5186532710.pdf
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/2t4oeb2mhcqpoeu5vplj041bsb/redam.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/435acbc652c3518acd43f699d82fcad6/bagotoz.pdf
    • http://rexant.by/upload/editor/files/vedozoxojisenujororedi.pdf
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3634c844a4---41921045526.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f955fcef4b---gewenopigerijagup.pdf
    • https://watertorens.nluserfiles/file/82045599404.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c5283fb4d8d---45679480165.pdf
    • http://brandiassociati.it/userfiles/file/30541067977.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=pagemaker+to+pdf+software
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0c9.bin
138b3781a48a38dfc1eb21f561a683e119bac77136ba0215f26a032a7b5b8911
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C9 17336 bytes
font_01_sfnt_off00010de3.bin
ff71bc8ec3e0e521b36a8e5df3e6782f71a040bf9a83a4c5086e2cae8ea0cbf8
pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE3 10780 bytes
font_02_sfnt_off000126a5.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x126A5 16792 bytes