Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9fa189ec70ccbae…

MALICIOUS

PDF

87.9 KB Created: 2021-07-01 16:46:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 20a563a61d609d96dfd2735df1fd344c SHA-1: bdf07d3024d5dc7fb84f04b38e998c177092fa2a SHA-256: f9fa189ec70ccbae0f3f9d850a51bf8ba4a7b10a8efaecddeeee70a6208e5d6b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate an attempt to deceive users into visiting potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/8ba5aa8e268cb1a3795ad89f6efdb2b9/kovunezuxi.pdf
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a9b3ad8e35f---jumefe.pdf
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/46a60951136dd1ad1aa8eb428916d914/noxaxogexiresiruv.pdf
    • http://kssi.ir/public/userfiles/file/95333193253.pdf
    • http://digifast.cz/userfiles/80255980910.pdf
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/lamawerumerawili.pdf
    • https://aravlicraft.com/cmsCart//upload/file/gosolerexepizeradexolame.pdf
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/14682f7d31c438733ea97b90bb9443de/15200341081.pdf
    • http://krikrik.ru/uploads/ckfinder/files/zijap.pdf
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/b670572138f7855f6bf6894afd7c6dda/vavexepugaluboli.pdf
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/l3488bt78pa9inlur41cdgpe9n/59544927956.pdf
    • https://ottenburger.com/userfiles/file/33908206830.pdf
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/995h5bcq0fs7scmin6r590nn29/pogibuwedikerebajowaf.pdf
    • http://ahsaipu.com/v15/Upload/file/2021541618384946.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=back+pain+functional+scale+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_off0000f5d8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D8 16792 bytes
font_01_sfnt_off00010def.bin
5f786353e7538d5bffc7c4edb891afea1da97c61f71f009f4e174d7b425a84a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DEF 10756 bytes
font_02_sfnt_off000126dd.bin
e6da879d6875e09b434cf08a40a6616e351928a9be9fb3708f02937de638fb5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x126DD 16964 bytes

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