Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c4c2568ceddee95…

MALICIOUS

PDF

82.7 KB Created: 2021-09-09 18:48:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9c31f3e809c56e4e63f55cef2e456624 SHA-1: b78c7cc56f3bf4d4f5a7296d0d3bd69d659e5a07 SHA-256: 3c4c2568ceddee95942113ff6f175086cf27b1e73c854a90b43fc7d758f5d6d3
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Static analysis revealed numerous embedded URLs, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The PDF's structure and the presence of multiple external URIs indicate an attempt to lure users to external resources, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://krisoc.ru/uplcv?utm_term=kali+linux+tools+tutorial+pdf PDF link annotation
    • https://goldfieldssanddrags.com.au/ckfinder/userfiles/files/17769869929.pdfIn PDF document text
    • http://cbstav.cz/file/dubetoja.pdfIn PDF document text
    • http://fgosvo.ru/files/files/96127521259.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/19859143139.pdfIn PDF document text
    • http://suarezbeltran.com/aym_images/files/limikapifezafe.pdfIn PDF document text
    • http://archetipoingegneria.it/userfiles/files/zedazozun.pdfIn PDF document text
    • http://abhinavabhishad.org/userfiles/file/xetezidesebiwaruxox.pdfIn PDF document text
    • http://niktid.ru/userfiles/file/84376103412.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/saninewuvapobafusuragu.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/795888e9e1780147d6537d0c835af40f/pisuvusejig.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202109040232453684.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/lufomilijilad.pdfIn PDF document text
    • https://davidfoleyinc.com/userfiles/file/22560831822.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/b989540febce0181b3539a963bd9b1aa/petasabogimavogijo.pdfIn PDF document text
    • http://arqing.es/ckfinder/userfiles/files/xidinulumutumaligexur.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613985ead91ef---pirupa.pdfIn PDF document text
    • http://euroteam.vn/ckfinder/userfiles/files/74497103407.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/jajonaxokoja.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136a0b986598---wiperodizozujuna.pdfIn PDF document text
    • http://tivatijapan.com/uploads/userfiles/file/4800689860.pdfIn PDF document text
    • http://dailynewsodia.com/assets/ckfinder/core/connector/php/uploads/files/71094408002.pdfIn PDF document text
    • http://3sdent.com/upload/files/46226299023.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613900532833c---99508778696.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_off0000e09f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE09F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B1 17132 bytes
SHA-256: 9434d43815de213872284e863b236f4ad6ef269f154bf605021dfa2ea0c78a24
font_02_sfnt_off000124f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124F1 10552 bytes
SHA-256: 3e16b37b6bc9a9a9ad926e742b379e29b94301218f119e4a90e246b745601a99

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