Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0ed7be5378c81f6…

MALICIOUS

PDF

71.7 KB Created: 2021-09-20 05:49:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: cebe01a7d168ac190cb4c61f0519ab8d SHA-1: 6dd7d1529778e4fc2a97104a8c43bad455c5deb1 SHA-256: a0ed7be5378c81f6f6c14fd7e97c7003bafaedb824acab5d60f3ed0b93d60427
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple embedded URLs, including one that masquerades as a download link for 'shadow fight 2 special download'. Several heuristics indicate the PDF is part of a link farm hosted on compromised or disposable domains, suggesting a phishing or malware distribution scheme. ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://infrive.ru/uplcv?utm_term=shadow+fight+2+special+download PDF link annotation
    • http://recko.ru/ckfinder/userfiles/files/43198982666.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/d6adc63b6f3869c1c725d88dfd86cc7c/67181351642.pdfIn PDF document text
    • https://eghamatkade.com/basefile/eghamatkadecom/files/gikufo.pdfIn PDF document text
    • http://telesson.net/_UploadFile/Images/file/mixaguxadege.pdfIn PDF document text
    • http://crm333.com/documentos/file/99122425066.pdfIn PDF document text
    • https://jimsdelibrookhaven.com/demo/jimsdeli/admin/userfilesfile/zologewela.pdfIn PDF document text
    • https://www.tunnel.de/files/uploaded/file/gediwadisitoranuzenu.pdfIn PDF document text
    • http://gorsilawfirm.com/userfiles/file/siletazezox.pdfIn PDF document text
    • http://residencelesaline.it/userfiles/files/13031726552.pdfIn PDF document text
    • http://geose.ru/userfiles/file/4697526183.pdfIn PDF document text
    • https://konyaalotaksi.com/userfiles/file/suwamagotaselenoze.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7d9ebc8cf---99439463507.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/c2685feadea81b3430e0f5cfe1539249/79935606773.pdfIn PDF document text
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/90865955741.pdfIn PDF document text
    • http://dungculamdep.com/fckeditor_userfiles/file/46984392081.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/nemowibajorodetibode.pdfIn PDF document text
    • http://weiddy.com/uploads/files/202109141812013181.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/ad9d9028f42c125f6891fcd4705b63bb/42636773700.pdfIn PDF document text
    • http://www.smartusb.info/images/library/File/43675149430.pdfIn PDF document text
    • https://forumsevens.com/images/file/73954685616.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/409a6fdb44a9e31317ef3afeccdd198d/30208871561.pdfIn PDF document text
    • https://ostrichtours.com/ckfinder/userfiles/files/75119201373.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_off0000b2ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAC3 11080 bytes
SHA-256: 8d5013d0222b4104f8bff5ce6675331daf177268a68fbe0d646ba3ba69ffbee8
font_02_sfnt_off0000e476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE476 17488 bytes
SHA-256: 38d0268d7bf03345bdc5901f4737c351d2bbd90136a226d91026059b26327396