Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcbde545a0308c3a…

MALICIOUS

PDF

71.9 KB Created: 2021-06-25 12:37:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 41dc05676a2f347d6086133405909785 SHA-1: b7af3bc34b538491c539ffd60f26a52618f62458 SHA-256: dcbde545a0308c3a7ab6e8c43269550bea6959a1bd70b521f116f1e272a45cb7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farm heuristics, indicating it is designed to redirect users to external websites. Several of these links point to compromised WordPress installations, suggesting a potential phishing or malware distribution scheme. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://catamma.ru/uplcv?utm_term=precalculus+sullivan+6th+edition+answers
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc3c8100f3---piwilexuselesa.pdf
    • http://isvpro.com/custom/files/vitezutamibejojorapopij.pdf
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b9cebf567---vumevekesazafej.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d0924193909---11044873981.pdf
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/688b0f05cff55e79a2a0253422eb3c9a/24691192153.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081579224538---3788315298.pdf
    • http://jrpst.pl/userfiles/file/77005328560.pdf
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/a39c4e6287087b676cbf9c5bae79fa1c/61406758659.pdf
    • http://digimaap.com/wp-content/plugins/super-forms/uploads/php/files/l4tt0db6ja1vi6kcsst1sandtt/doxisilurofixixuloninigo.pdf
    • http://arslanemlak.come/file/nupadu.pdf
    • http://kimbuunguyen.com/uploads/userfiles/file/mivuxakuval.pdf
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/a7ab6f0a9757d2e49bb3c98c946c1457/gelop.pdf
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/8dvh0rrlj5mmrur485ktiqa7i0/32385566589.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2e335c62b---kijujatadizopod.pdf
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b545.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB545 16792 bytes
font_01_sfnt_off0000cd5c.bin
82f760695ddef84b5fc06d197feb0a2e6edb32a9190529ac322bc5d702296bcf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD5C 10888 bytes
font_02_sfnt_off0000e690.bin
ad1504db6f897d1983507268b602fd30c629cfe1b4efa729593094a7b96e3c8a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE690 16356 bytes

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