Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4f36e45b991d2a3…

MALICIOUS

PDF

79.7 KB Created: 2021-09-20 11:16:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2b0991dce85e844466aa1da87a343c1f SHA-1: fec408fa30e7a10f8020557407535e2c4b3a80b6 SHA-256: c4f36e45b991d2a333f116eadf49164ba568ca5bc361c6f8d4b8dd48f522d7fb
124 Risk Score

Malware Insights

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

The file was detected as a phishing trojan by ClamAV. Static analysis revealed it functions as a link farm, with many URLs pointing to websites hosted on compromised CMS platforms. The primary purpose appears to be directing users to potentially malicious content through a series of indirect links.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4611

Heuristics 5

  • 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
  • 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://trungnguyenjsc.vn/uploads/image/files/5800553241.pdf
    • https://korvioinfotech.com/ckfinder/userfiles/files/rerifawijud.pdf
    • http://archi-m.ru/userfiles/file/melisabal.pdf
    • http://kelsenator.com/userimages/81203327809.pdf
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/4a81856ce5cf8fa56fa70c10d917c53e/61443693889.pdf
    • http://happinessgown.com/upload/users/files/lifagasibaveketa.pdf
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/733f6a01ae3cc46a45970d1aa6636c8f/domitorerar.pdf
    • http://aquarium-kochi.com/app/webroot/ckfinder/userfiles/files/vilumunitugebi.pdf
    • http://vitanova-cattery.com/upload/file/27362946747.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137b892d53ae---72613673583.pdf
    • https://fibaquitaine.fr/cebatrama/userfiles/files/favuperemegesiboromat.pdf
    • https://ap-qatar.com/userfiles/files/pidoxudumidamiluduselizo.pdf
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/ba68dceeff3dadb665bc3eacf6847946/80650619183.pdf
    • http://ux-school.ru/files/files/tokakupobojemekedexusawet.pdf
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613dcf15e2a87---sugos.pdf
    • http://misterholidaysanprisco.it/userfiles/files/xexetan.pdf
    • https://pfollowers.com/ci/userfiles/files/65347165211.pdf
    • http://vet-spb.com/userfiles/file/31313244715.pdf
    • http://iltorg.ru/upload/file/xelasubinukagajuti.pdf
    • http://ritadas.in/userfiles/file/65435803997.pdf
    • https://worldpigment.com/image/upload/File/tavojuzitaf.pdf
    • http://newworldss.com/uploads/file/voxomuvasebugavafizuba.pdf
    • http://kimandyoo.com/userfiles/file/lizotepewitu.pdf
    • http://seamcc.com/UserFiles/files/lotulazoke.pdf
    • http://sh-ruiyangcpa.com/userfiles/file/2021-9///202194224549458.pdf
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/058249bec87b1a2152937abca1f2639e/83902235523.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=write+nfc+tag+android
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000105f8.bin
0de586415fc4b760089046d53589d1cd609b64d0e01ba3d243f37d8c557a0932		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105F8 19060 bytes

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