Malicious PDF — malware analysis report

Static analysis result for SHA-256 f76e6d84510724be…

MALICIOUS

PDF

80.8 KB Created: 2021-08-02 15:51:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 544a1d11271bef6b830e4177cc4bdc01 SHA-1: a992330b15181d34661fc6be7bce63a9797da5fa SHA-256: f76e6d84510724be9f90c6582e2aaa3aa56609f881029d7c48f04e7a859fc1ea
196 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, exhibiting characteristics of a phishing or trojan delivery mechanism. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document attempts social engineering to prompt the user to install something, a common tactic for credential theft or malware deployment. While no scripts were directly extracted, the presence of numerous external URLs, some hosted on compromised CMS platforms, suggests a potential download or redirection chain.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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 http://sintjorisparochie.nl/userfiles/file/lugogofufomoxiduzeju.pdf In PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160734a8d9ab17---nokupoxesubi.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3adc383924---juwudelemodek.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/98619635005.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074729632d4e---96366990925.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/fakerunajuwekup.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/zuxap.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/203df653008c9c62c4834d36c7f16996/vamobopiboto.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/67163052144.pdfIn PDF document text
    • http://railwaysrailroads.com/upload_files/files/15292715833.pdfIn PDF document text
    • http://kuzfarm.ru/images/file/zexulotakuxavazagakopi.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/a78fc26e919a29d9d715e10e4ffd0281/maluxupugojetemotinizeb.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c269c74ab6---66418789562.pdfIn PDF document text
    • http://porpora.info/imagenes/imagenes_contenidos///83512336989.pdfIn PDF document text
    • http://samtekelektrik.com/files/5812640800.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/17e33b1daade66db06a5fd94558f290c/70748112863.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/u3dqu4r8241v88112jf5i8kkuc/linenebogokija.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/50704114415.pdfIn PDF document text
    • https://lexcyberia.com/userfiles/files/31459888949.pdfIn PDF document text
    • http://hccc252.ca/clients/e/e4/e484b38507f190a955b66748903449e1/File/mutivegig.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/80855892210.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7b55d4fdf---65398478465.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/3b9de2d231c428b5cb4fb59a1f34fa36/bogezadetiwobavojes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=wedding+anniversary+wishes+in+marathi+images+for+husbandPDF 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_off0000d9fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f214.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF214 11252 bytes
SHA-256: 55f6ff6ea055554a8d11ed0e182085ca9709660b3c1dd7c2853f6f1733e93c44
font_02_sfnt_off00010c23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C23 16168 bytes
SHA-256: 90639e5598eb1b062da8da8bf4ee622aa3f02c63da3c43de8b11067de1541718

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