Malicious PDF — malware analysis report

Static analysis result for SHA-256 be9fa174f9213a82…

MALICIOUS

PDF

74.7 KB Created: 2021-09-12 13:21:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bf9e329470dc5b2e20f01f9a2f66ef14 SHA-1: be0816ef61cac87ddc62cd5ae106d8854ef80490 SHA-256: be9fa174f9213a828e0a13a416a4d9d4482e53e7273ef0eda8eb85b4a742e782
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many of which point to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution through these compromised sites. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613caab7e74df---87287502806.pdf In PDF document text
    • http://partnercable.hu/files/36731431338.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/v4ioshttgei03b9mtmqrvc5mg5/5751814365.pdfIn PDF document text
    • http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/13648256643.pdfIn PDF document text
    • https://loonbedrijfschimmel.nl/userfiles/files/maboge.pdfIn PDF document text
    • http://bbfederico2.net/userfiles/file/73614789183.pdfIn PDF document text
    • https://habibitours.com/ckfinder/userfiles/files/nexelenenoliwo.pdfIn PDF document text
    • https://gulfb2b.com/userfiles/file/83383624388.pdfIn PDF document text
    • http://kiko168.com/UploadFile/file/20210910095314032.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/51849417980.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/4191a65bf07c1a86921f20ba0be6639a/tutibovifesakimo.pdfIn PDF document text
    • http://www.pvvc.cz/files/jemigag.pdfIn PDF document text
    • http://newbusan.net/FileData/ckfinder/files/20210905_E53672A6FE37DACD.pdfIn PDF document text
    • https://fluffy-chins.com/images/file/81752031913.pdfIn PDF document text
    • https://nsstore.mx/ckeditor/ckfinder/archivossubidos/files/12788494300.pdfIn PDF document text
    • http://studiomontironi.eu/userfiles/files/vezidojosa.pdfIn PDF document text
    • https://tahuacoop.com/cms_gpadmin2015/sgi_userfiles/userfiles/files/sonomevonujuz.pdfIn PDF document text
    • https://renetravel.ro/images/files/liboperuxomodoxilajogazib.pdfIn PDF document text
    • http://krishikhabar.net/assets/ckfinder/core/connector/php/uploads/files/mafulideged.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/73868766439.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/fofukobedifovijebewov.pdfIn PDF document text
    • http://dae-young.kr/upload/fckeditor/file/mipuwepezajotirilomanok.pdfIn PDF document text
    • http://shamayachts.com/upload/file/68333203744.pdfIn PDF document text
    • http://chinhsuasolieu.com/media/files/92747973502.pdfIn PDF document text
    • https://joinvita.com/neu/userfiles/file/88098832786.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/pumezesowogonelo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=four+letter+words+beginning+with+vPDF 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_off0000bf44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF44 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d75b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD75B 10736 bytes
SHA-256: d6a0a57f9baa14179c8e7571a62a0a29cd28521c2f458dfcdb158a68a409c07e
font_02_sfnt_off0000efc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC2 17240 bytes
SHA-256: baef058cdf792b7582b1810d263adb172b836901b9d7e40cd7e579b7e3abedfc