Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3c37a0efe7760e7…

MALICIOUS

PDF

92.5 KB Created: 2021-08-03 07:35:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: a8b23dd12e8a4f373023ce25773ed33d SHA-1: d4a78294a80418bdb077f73cc47be7a0187c48a1 SHA-256: d3c37a0efe7760e74bbb494fce7c250d2ebc645e1d353954d61d640180ae684c
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous external URIs and link farm patterns, suggesting it is designed to redirect users to compromised websites or phishing pages. The presence of multiple distinct hosts and the use of 'utm_term' parameters indicate a coordinated effort to distribute malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

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://garglob.ru/uplcv?utm_term=descargar+cd+de+los+angeles+azules PDF link annotation
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/qr4sf2785g1hsp4m5n2uuvnj31/39869840672.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/202c64cf722fc8ae4f0b781f0de1a173/gomasofonulosewibiwaj.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/dra2dva30mkhk0kjss3kg1b8ph/fewuwerilukovoji.pdfIn PDF document text
    • https://makeswebsites.com/clients/c/c8/c8c605999f3d8352d7bb792cf3fdb25b/File/bunisimezefogomif.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/77713686625.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/9af136a12f1162d7c2832e144f57fb33/35349499637.pdfIn PDF document text
    • http://aven.su/userfiles/file/21009381125.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090dbdc15ad4---99732152093.pdfIn PDF document text
    • https://termofriz.rs//files/babefepalevifuzirika.pdfIn PDF document text
    • http://tykhestudiodesigns.com/clients/7/73/7311521ca682816632878891c231d107/File/66384221170.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/9035635d80638750f91ac9d9f3dbf8fe/81411943128.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f30445e5cc---23384968402.pdfIn PDF document text
    • http://hydrem.ru/images/file/vategojojimedorabuwepa.pdfIn PDF document text
    • http://epoetryworld.com/clients/53741/File/logemefowub.pdfIn PDF document text
    • https://www.zulilighting.com/wp-content/plugins/super-forms/uploads/php/files/8bcb0877495851a81d98f98d9ce0e865/zajujalejebinota.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/fibatu.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/f0avn5qk7bbjru69atr6spfabf/55283411235.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/290255fa1a69011ca7aeb74cc89e1b8c/29528086698.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/77540160938.pdfIn PDF document text
    • http://soundreaming.org/wp-content/plugins/super-forms/uploads/php/files/7f92ac283228cc15aa8c13890bd62c8e/16797453373.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608c06d2c83e2---puledunufuvageva.pdfIn PDF document text
    • http://www.companyforte.com/imagenes/editor/file/kagelebexunejonofuf.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a85267025a2---27181833969.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1C 10516 bytes
SHA-256: 5fa0489adbbac4f609831e078865c88c1d8ad395790cd833d53614c5d7b2b890
font_01_sfnt_off00010404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10404 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C16 18840 bytes
SHA-256: a6f54d2397b3e1fc1eab26a3900c3e7d8d2fa7c2e43b7c53ff03d64aa04b52f8
font_03_sfnt_off00014c3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C3B 16384 bytes
SHA-256: 6bc4420bbfa61156f096b6f0725168f8601d7500e332933a6f3144c23c09a2fe

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