Malicious PDF — malware analysis report

Static analysis result for SHA-256 acea4fd9bb707235…

MALICIOUS

PDF

93.0 KB Created: 2021-09-02 10:32:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 52e8fbe01f2962e1f63ac59ec819e77b SHA-1: de0bb442057e0f0a3af82fdb2a49b4d48247aa46 SHA-256: acea4fd9bb7072350040b2d2976351d77e834f17287a5307fe78e3f351d3b1d6
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as a phishing trojan and by an ML classifier, indicating malicious intent. It functions as a link farm, with numerous URLs pointing to compromised CMS upload directories, suggesting it's used to distribute further malicious content or phish users. The presence of multiple PDF-specific heuristics related to link farms and compromised uploads reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://tatsolarlight.com/uploads/files/14689275737.pdf In PDF document text
    • http://waetsukai.jp/system/ckfinder/userfiles/files/munok.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/29ab095818ebb4bb0ee84a451292f27f/niromofepesipoguw.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/520f63c0ad487c418276fbdb6a09ac19/40949354952.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bd008f1e38f---84144831719.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7fe0e5dfa---togetinukitupokamapeme.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/16075ecb767852---xevuketekefiwoxedalilu.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/a0bq837bof8k523n8pmrv75cg5/kefisutedavaxemagedejaxu.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/8f7ad6bf53eb8f64f26bcfa373044316/44847843127.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e47b6a84b11---99717039178.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/irpes9itmq9fuaba3q7b5rbsl1/72914596302.pdfIn PDF document text
    • http://imreelectric.sk/uploads/file/wawovelepajemosajeviwipun.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f8e24a2acbe---gifaruremanolikakit.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/6i3v83j1q2pafdcqm46qg8dap4/48699013984.pdfIn PDF document text
    • http://hoanggiaphatstone.com/upload/files/59648782156.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/6qjvbhf0lnerntorheju8h7can/29168790069.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/kiwaradopivopinutosijuleg.pdfIn PDF document text
    • http://thepducphat.com/upload/files/19938050520.pdfIn PDF document text
    • https://comillaspostgrado.es/userfiles/file/97739173226.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbce178a70---94312065779.pdfIn PDF document text
    • https://laplacedesstores.com/upload/file/52893348392.pdfIn PDF document text
    • http://yuanhebiotech.com/upload/files/teratetebanotukepakevema.pdfIn PDF document text
    • http://mynigaoe.com/upload/file/20210530083052.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/tokugu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=is+a+crab+multicellular+or+unicellularPDF link annotation
    • 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_off00010234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10234 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011a46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A46 19980 bytes
SHA-256: c71b8aa45d3aefa5a8ad3377f862010f17e86a367fe47451966b02c1465d62ad
font_02_sfnt_off00014e91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E91 10584 bytes
SHA-256: ca8ed2028f6cf1ff7fa49930cc83daacb6ae3e301f0cede38ba2c1a8a276f407

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