Malicious PDF — malware analysis report

Static analysis result for SHA-256 3eca1b1afd7fadfb…

MALICIOUS

PDF

74.9 KB Created: 2021-09-02 08:08:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ca0d46917b57f7b57aeaa24934c9a8fc SHA-1: 6c94bf47963e1a7467d9d4eeed379d6e4f401ea4 SHA-256: 3eca1b1afd7fadfbeaa290dc129d2cff626a33e7b360e870605b1c3875874821
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous URLs pointing to compromised websites and disposable hosting, designed to redirect users to potentially harmful content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://istocdukkan.com/userfiles/files/zubufukisivifer.pdf In PDF document text
    • http://debschoen.com/userfiles/file/819158473.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2a02449a4---16753234066.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b1e4e6b6619---xanubepab.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/bajino.pdfIn PDF document text
    • https://vansuloi.com/uploads/userfiles/file/60646233354.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096516c5f2a0---bemesupojoxorokemabad.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4d164e38a---40030972560.pdfIn PDF document text
    • http://etrustmi.com/ckfinder/userfiles/files/remewubazimoxomovo.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/895afd912df5025aef0ba8b773e950e1/gobigubelobavokelenif.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160c294131ed9a---3248305967.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/973cqd3leroa0dmb6j2pgp7pv7/tefujupadebetopa.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f757ff17f0---80123698212.pdfIn PDF document text
    • http://jwnorthclassof70reunion.com/clients/c/c6/c6167e942b76adab5863fbee8ae727a7/File/98307261170.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/konudarewase.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/968ef647003ea161b20a40fce960c2a3/wizoraximefilutodib.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16120e5a807681---vodim.pdfIn PDF document text
    • http://patriabrno.cz/userfiles/files/gegabokibiralijarubax.pdfIn PDF document text
    • http://stlukesmn.org/clients/17773/File/rakadaxivezafa.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2173aa6f1---21336363288.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/42695122465.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160a7343f099af---37266722775.pdfIn PDF document text
    • https://kund-in.com/userfiles/file/21901014470.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=isohyets+definition+geographyPDF 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_off0000bf5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF5E 10796 bytes
SHA-256: 41d127c1c45e8871d017be2576d9cda1cec6878f6c1c63848600219e56e4e3f7
font_01_sfnt_off0000d804.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD804 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF016 17748 bytes
SHA-256: 6094e4d4150d6554e5337aca649c6247d4bd7338ef6f0a0c3d0537d194764128

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