Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cdb52dc6b815bb9…

MALICIOUS

PDF

90.2 KB Created: 2021-06-15 22:32:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 54514c0fd3a3101d27f3f6633df95677 SHA-1: d067d60676bedc457232cab95efd089dc14de90a SHA-256: 2cdb52dc6b815bb989c76d041a61360a575bef8aa835f29d60eba4c5ea5583e8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload storage or are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body's content, though heavily obfuscated, includes metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://huntic.ru/uplcv?utm_term=new+year+ka+image PDF link annotation
    • http://scro.ru/pic/file/wagozepadiwerefesevo.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607dde419cb2f---70390726021.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/nelalubanegijiruge.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/54cc5613458dea8d4179da64e2c3f448/zakom.pdfIn PDF document text
    • https://cgeminfos.ma/upload/file/94231613782.pdfIn PDF document text
    • https://solidpractise.com/files/userfiles/file/wiluvedagewexosixurema.pdfIn PDF document text
    • https://yellowstonewildlife.com/56025484009.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16088e01c9cd7c---52869840758.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/57653915313.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/rre2dqp7fds9md1fkih4fdeokc/40153352363.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021061602463373499.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae77b666fc6---30406587005.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c96813873e---didikesogojuwesidajizero.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b53d608ba6---98176570445.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/15997b4596f20082e51bfe46b953fd61/wamekovosokoma.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/6c42cab1aea393d7fe3b868727d3e832/jikozamivazifusagozame.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc30d4bb85b---16518915202.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088287190976---tunugisixujuxiloka.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn 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://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F0 5020 bytes
SHA-256: d870c6e184f157e4f3fe8513e6deb3268bb650abbafc797e8098064e66f3b1e0
font_01_sfnt_off00010412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10412 3720 bytes
SHA-256: d5ecec3e822993868ba70e247019bcdb656a9fee58d620eb93bc70658e929280
font_02_sfnt_off00010f75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F75 10100 bytes
SHA-256: e81543b5e35238f548c520fa37c224cf08df38793647627bf255a7e3cc7f5921
font_03_sfnt_off00013258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13258 13760 bytes
SHA-256: 1d94cba628a4868786b0b05507b141aa4aedffd3e1158da7c4c6f23eaa4a3171

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