Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6ca685bc87cc894…

MALICIOUS

PDF

89.2 KB Created: 2021-06-29 08:16:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b381799fa00aaaf4ba850357d96ecf59 SHA-1: eb4aa51a1ec0a8173b3a2e908c9f0f51f028351d SHA-256: c6ca685bc87cc89465b2ae818c7d3068e0074c1165b95635fba9851e7604e295
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and does not provide direct clues, but the heuristic firings confirm the nature of the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160ace19909604---26592913238.pdf
    • http://edanieltour.com/FileData/ckfinder/files/20210621_395660961D340C33.pdf
    • https://aldapa.eus/files/galeria/files/19508791742.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160a2577bd1d5d---novarezetavagelulunemafut.pdf
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/kmrf48shjahtqat9d4eiper154/59113765600.pdf
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/0eb326c0d2206eb48f2500af05ac7307/pevuporaf.pdf
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/9ffadc235c957a521b6faa6feec54613/xetomekonogibusufox.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/2cbe7aa81ddd0607eb34e4cd301eeaf5/58451041832.pdf
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/6e9a3b96f918d9e5a02ee16aaecc3180/nibav.pdf
    • http://www.awakohchang.com/image/upload/File/itomovetetanunizexex.pdf
    • http://teraval.cz/res/file/35490041167.pdf
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/ff8228e95254cdfaca7131b23d2b2f3b/ganon.pdf
    • http://dientrotiendathc.com/media/ftp/file/mozopudujewijoberas.pdf
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608017fa9597e---limojetawamevigapikawad.pdf
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/dd0dc1f755e2eb553b2b5584bcdd1ba7/62675127418.pdf
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/2a2e8e0808eef0de1ccd6a68f243664e/24161285757.pdf
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160845d223d694---gezejaves.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160a68cfa0f910---64175420513.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607c92400b95a---sagiwojosad.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160990fbc3c7ce---76980981385.pdf
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/q1c0ugdrta2m694pul7i6e9491/medogometetokukuvet.pdf
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/c70646a8e2aaaadc20af08d399618d27/sapade.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=plate+type+nrv
    • 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_off0000f9f9.bin
14c96ed925309aca27d36badd5b7fa672812d6261818ab8f9c628a7d01c9263e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F9 10048 bytes
font_01_sfnt_off0001107d.bin
74d66fa0d7a4b8b7b635cadef5acff443ebe9856da30c036a6f129a9ee98d236		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1107D 18196 bytes
font_02_sfnt_off00013fcc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13FCC 16792 bytes

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