Malicious PDF — malware analysis report

Static analysis result for SHA-256 e53ce6d6b5cbca36…

MALICIOUS

PDF

72.7 KB Created: 2021-06-17 22:04:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1e8e1914964dfe18ae29503581bc0f75 SHA-1: 0e753db8e35c1aff0b308a2f65397b1f9605ca00 SHA-256: e53ce6d6b5cbca36c04dd2856465a5a8eedb056e0820c7fa3d1df8c7a2c7079a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to compromised websites, many of which host further PDF files, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the presence of multiple external URIs and the nature of the heuristic firings point towards a malicious document designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608756bf57222---gosenaxumesesip.pdf
    • https://lienlacanien.com/img_pages/file/kises.pdf
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16083fe8615ae9---bitoxofepuvobamivezune.pdf
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/898207c38d4478aa153530af8c320ef1/35606472745.pdf
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/ctg4haefl14c3c8099k4dg3skn/52582440368.pdf
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160be7bdb4e0af---18231984376.pdf
    • http://dlmberatung.ch/userfiles/files/4007097304.pdf
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f18da2d761---titoburotutaxifugafutib.pdf
    • https://cleaner.pl/userfiles/file/64835242755.pdf
    • http://xn--49s538bo8ux8c.net/userfiles/file/vofofavavukam.pdf
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/lp9f35e10f81v7jukugte5ohhi/70594383724.pdf
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/16076dbeb016d8---midegotewa.pdf
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/c5ead17551abea152417f53280bca093/lunixafenoku.pdf
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/1f1e7c1091515a6e3967b10ce907115d/19966559376.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/d488a5b8c6c908def2d1ddd75725fdb2/45842359839.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=class+12+physical+education+notes+pdf+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dda6.bin
db36f0560f3d9d39db536d9971ac82773699ff0cf46120fa3e84963a16cc4c63		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA6 5428 bytes
font_01_sfnt_off0000f03d.bin
4e10e9f85afe61a6b027f3f47a1208dd480e7febfdb30808fdf42a220d47344c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF03D 11164 bytes

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