Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a406505a0b84f16…

MALICIOUS

PDF

84.0 KB Created: 2021-06-18 20:20:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 46de66a06af54937dc427e5f2e92b132 SHA-1: 94b801aa97ee5d187c419f9980097764f5cb4894 SHA-256: 6a406505a0b84f168a69d1f62cd23e90c43ad9d02c6d138000e77a5d7e51f6ca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress sites and appear to be part of a link farm designed for SEO manipulation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, suggests a lure related to 'vehicle mileage log book excel template'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160908e2b13283---sunuzafo.pdf In PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16087a06ef3904---82417758693.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/4917436199.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc1405182fb---15134696920.pdfIn PDF document text
    • http://cnkls.com/userfiles/file/1623277973.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077765f62d7b---43322124664.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/e881875e41f91ebb149a4b45c01db81f/4649737149.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/6fa9511484d93ab807fcc861ca0bfd26/nemalozarumutoporuk.pdfIn PDF document text
    • http://asokmontridental.com/userfiles/file/nimimezizi.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/nesujawolanazujajarumose.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/puwonuwidut.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/988ccf1aaf5320def0e8bdc85c71bcd5/59120450696.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/3ou99ajhtoggdo849h7qi65n7o/12626868124.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/xobag.pdfIn PDF document text
    • http://hollandunitedreunion.com/clients/5/52/52f3fdf721cdccceb566e47094f1d9de/File/litejaniju.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eca19f1646---46164938445.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=vehicle+mileage+log+book+excel+templatePDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fde2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE2 4992 bytes
SHA-256: 1438b52ac49f5205a500ab8dd1e42ad694375d9f6b1ad239fbe2e92404f9479f
font_01_sfnt_off00010edf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EDF 11168 bytes
SHA-256: 542e19d60d14ccdc7fedf7b29d97ec72eb9f9efab5cd5a34d0c5b07e0efa2f4e
font_02_sfnt_off000134be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134BE 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361