Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5e3b9207dbbcc5a…

MALICIOUS

PDF

74.8 KB Created: 2021-08-21 13:53:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 171e7bad9de1079efcb69b303b76f407 SHA-1: 3c3fe93a6ea46935bf107500f9532ef748ada313 SHA-256: c5e3b9207dbbcc5a45b6fb504559b098e8ed4e67f8029e7c1a40d630b9e7b132
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous external links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a tactic to leverage disposable hosting and compromised sites for distribution. No scripts were extracted, but the overall structure points to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://crewmak.ru/uplcv?utm_term=plan+de+desarrollo+urbano+monterrey+uso+de+suelo PDF link annotation
    • http://arcos-eff.it/userfiles/files/kemapukopiroxibewexe.pdfIn PDF document text
    • http://denis-lefebvre-services.com/fichiers/file/rinilegizupafi.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/16092379c36461---wagajuripominaposi.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/32baa1b6c6b78e8fc3dfaec454db7fb2/vovesizurudonumitu.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/gqk0off2hqqo4kf7f5ncic5vi6/nopufutigux.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/05/16/file/20210516_115607_108.pdfIn PDF document text
    • https://i3mit.com/shopadmin/upload/files/68747902972.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708daa7f2f0---84200096313.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/xipewunodovozigenemoxetab.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/lolepojuruxavisob.pdfIn PDF document text
    • http://k-sta.kr/FileData/ckfinder/files/20210804_7416E0F2F491E6F9.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16078e8bf8a6e8---totel.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/d5817f89de99c5fd21fb09485e28ca5d/5068564106.pdfIn PDF document text
    • https://stomatoloska-ordinacija-rijeka.com/files/80666252795.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/4c4411ff5db24c225addc6052bb759c9/ruxozuzedolugevepuke.pdfIn PDF document text
    • http://asavn.vn/uploads/userfiles/files/rodifujebepisudowa.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/vebamefi.pdfIn PDF document text
    • http://euroear.eu/ckfinder/userfiles/files/95954487992.pdfIn PDF document text
    • https://knoxvilleremembers.com/media/91432598152.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095e06251801---geropujovofepejofaforu.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c384755b0---28723560978.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/zupatof.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608463fbe6d90---mirenulitazugosomiwabe.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_off0000c1a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BE 10672 bytes
SHA-256: 4a41bd4c91f05117b70407fa0c903cc7ab13dbdcca731f1e8d732f509c687d18
font_02_sfnt_off0000f23c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23C 16824 bytes
SHA-256: daf5bf149b0f31956f06be8e8d3c4651a7392fb9502b777cff37bab363a34013

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