Malicious PDF — malware analysis report

Static analysis result for SHA-256 169614b769c0a0c5…

MALICIOUS

PDF

70.5 KB Created: 2021-04-28 05:31:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6b572bd7f4c653b67cafd379dcba9f6b SHA-1: dad9c9a55dbcf580636aefc4abde1d9999dfe027 SHA-256: 169614b769c0a0c5a99974c8d589c7e7396f9d6ecc1422c407e10dacd20d7f12
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to compromised WordPress sites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/75eeb3cb6857cd8605da73b7f6df52c4/95052793070.pdf
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/39d9ksn2mucftok9b0lsal3hab/46809095505.pdf
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/ellt84bah6sg4ui2pqui8brhe5/31457356450.pdf
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/0pvkqrpht8jnvfa0tkf4e1d8pc/98635717462.pdf
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/a5829e0519d8400b0a750546f69bba8c/79307090058.pdf
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/th8hnapor7dkpeuhfn85j8e83r/97214442696.pdf
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086eec0ecdad---bogiwarumodobotulaf.pdf
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607860023af23---36150893072.pdf
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087ed2d6397e---27987550465.pdf
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/7r9ok9lrfav95id0oh5qua32vl/8015661210.pdf
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160715452b1f9f---17623684575.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160827b84497a5---79422386673.pdf
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/df0ff6d3f826f853339e0c3824a318c2/nibel.pdf
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/c67d50c8c70e3771fdab88295f834a64/kekupogiremim.pdf
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607391ccb3c07---56370460569.pdf
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/0d7b82355f74cdec7f90c0fe94388581/23045503989.pdf
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/046980dec95d4923ecadd355f534ee25/sutefobijo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=ferndown+weather+reports
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d97e.bin
d5a6eb888c78226b9ad82a1cefb313172b3e78719d370f8a8fc5e35d6d6299a0
pdf-font-stream PDF embedded font (sfnt) at offset 0xD97E 5060 bytes
font_01_sfnt_off0000eac0.bin
f6bbe39d95bf395029b1c77aafe2fce3ca932c7e9eaa1a44f10f6b0abb707e5d
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC0 10184 bytes