Malicious PDF — malware analysis report

Static analysis result for SHA-256 94882b0cdf1e8a7d…

MALICIOUS

PDF

91.5 KB Created: 2021-06-25 15:04:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 65327c48ccfd300434e2100e7449127b SHA-1: e43f9803ddba5c87d86ce8b8fe7f5a2551d7a3ad SHA-256: 94882b0cdf1e8a7d4a7e9488dc536d585e0c0395c52b98705a6e07f2b2dccb23
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. ClamAV and ML classifiers strongly indicate malicious intent, specifically phishing or malware distribution. The presence of multiple external URIs and compromised upload links suggests an attempt to leverage these sites for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://medvor.ru/uplcv?utm_term=witches+in+different+cultures
    • http://dzbnf.com/upload/file///sekaxuzetimodipojivuxanoz.pdf
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/ee177b185fefd13358785f5027c43d41/kulufilawilimivebogowi.pdf
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/3mamr3i4jgtaug7motv5219cuv/61707874622.pdf
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074f73b76c50---fewewetuzovumifakulipipum.pdf
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/d4910ae970b40c0b8354e668abc96fcf/rawerozoxexesowow.pdf
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/2c0c4070d64635202877e9f789d2aeac/38065567750.pdf
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd9ba17ab20---64021315097.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608268b7336ec---giwawo.pdf
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/242590c966cb7e30f05bb9821e38efe2/19498782456.pdf
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f2eb13ee95---94356452171.pdf
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/rdco1ah5qbdk9ga5ta4dkhdhfu/59961305941.pdf
    • http://banphimchuot.com/userfiles/file/87995365938.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16084898cb3fdb---vifixedogu.pdf
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/d90f6dabdd101c3cec58c9846a00366e/namiraraku.pdf
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/bpt8enqkvqrm3nj2m44i0jlfog/parebirikubalijopu.pdf
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/dd841b69045796b3e53afaea039c319f/dawinidoz.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_off000100ff.bin
361c19073a1bf9456f017605e0a0f371e4d038edc78b56c69a13d045bd22b997		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100FF 10384 bytes
font_01_sfnt_off00011869.bin
74deebd282ad8c8b0bee1e2a7f17f2fef49c30a63d427bfed8f935c8f656ad8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11869 18260 bytes
font_02_sfnt_off000147d4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x147D4 16792 bytes

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