Malicious PDF — malware analysis report

Static analysis result for SHA-256 87ee516417abaa42…

MALICIOUS

PDF

71.2 KB Created: 2021-09-01 16:15:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 773cd8bda6eba025da799fb3d1e0e9b3 SHA-1: 7de36ff480aadffc54ae3bc43cfa916fa41b0d2a SHA-256: 87ee516417abaa4250b47b7609908fd471542b2cc6f3861bb0bfd0d0246ace21
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains an embedded JavaScript stream and a large number of external URIs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://smidgel.ru/uplcv?utm_term=finding+zeros+of+a+graph PDF link annotation
    • https://dichvuketoanvn.org/uploads/files/21972099911.pdfIn PDF document text
    • http://brooklynsmokeshops.com/admin/images/file/vexuzatadi.pdfIn PDF document text
    • http://cochemical.com/upload/files/58504783947.pdfIn PDF document text
    • http://elisa5888.com/shopadmin/upload/files/69278687352.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/kkg3od4jp1pkko3ifschdi1i31/88081206710.pdfIn PDF document text
    • http://xn--12cmi2byac9cdhd0hra6d7bxkwbgj1gch.com/user_img/files/dizimirobalowo.pdfIn PDF document text
    • https://www.tzounakos-insurance.gr/ckfinder/userfiles/files/693379684.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/47c8bc82b90a28803b23adc8a9d6db58/bukogilumod.pdfIn PDF document text
    • http://www.alrafeef.com/faisaliya/js/ckfinder/userfiles/files/25497835443.pdfIn PDF document text
    • http://geometracosentino.com/userfiles/files/lipuwifekivuz.pdfIn PDF document text
    • http://inglewoodreunion.com/clients/68690/File/84304247873.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/8858892049.pdfIn PDF document text
    • http://kgmda.com/upload/files/22094845909.pdfIn PDF document text
    • https://trouver-une-ssii.com/img/pics/files/dafexuvexipego.pdfIn PDF document text
    • http://boki.hu/editor_up/74681710436.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/30591251518.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/maninolebanemosovaruza.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/87195598460.pdfIn PDF document text
    • http://ankamet.com/userfiles/file/jodinavuwidofeluw.pdfIn PDF document text
    • http://thedreams.cz/files/78353893616.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/9umdmmhkqph1cgu07v6p96d7nj/noxadavunewa.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/8fe12af0a5caac2fa52e6c1163948d4e/sobekatalamovux.pdfIn PDF document text
    • http://gaskinfamilyreunion.com/clients/b/b7/b798c9f9e2af69c3a5b950a06e4ade8e/File/31710219302.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/tiredadosoxaxisowojur.pdfIn 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://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_off0000b757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB757 15452 bytes
SHA-256: 952add56cadfc144090139a5861628ba44d4429bf5ca334d5579d57525d69b70
font_01_sfnt_off0000de94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE94 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f6ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AB 10672 bytes
SHA-256: 1e68edcfb582e72c191eefcabe8a71c37e8cad4d28b1a8ca7a50aeb1d915e91c

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