Malicious PDF — malware analysis report

Static analysis result for SHA-256 6308c8950796fb17…

MALICIOUS

PDF

74.9 KB Created: 2021-05-23 06:04:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1d0cb8fdb5ee66be3acd1ed53b30ac32 SHA-1: cb49ea93337f06e7b1a1424ebb0d308671472fd4 SHA-256: 6308c8950796fb172bfbc1cbb4d331389267b36629bef2af4aaca8ab9c9445e6
154 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories. These links likely serve as a distribution mechanism for further malicious content, potentially exploiting vulnerabilities in PDF readers.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6233

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://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a97b9037aa6---82822753744.pdf
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/cc58c4211071ae960e60c1fcc3ac5de2/pifog.pdf
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4403890a2a---tefupegerexupoguwux.pdf
    • http://jjmcp.jp/userfiles/Image/file/3871891373.pdf
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/kale3eeb94enei7e82jsl8vuoh/52864663070.pdf
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/ce249bfc2e0318a60430bbbbe28a9aa9/58979207167.pdf
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/0qrkakstsq94uiucct21vmjlq2/67733069779.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609489eb9144f---85707187376.pdf
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/7vpgt2odqg1o4a1ci2ospintjf/21801726707.pdf
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073b5c82169b---4808490265.pdf
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ea4812de58---65674975096.pdf
    • https://www.nuyew.academy/wp-content/plugins/super-forms/uploads/php/files/ae5952c09057dcb877de0592bc49860b/lutedabujinosu.pdf
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/7fbacb3ac8b509e20c4be2b26611525d/62482212534.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c21883523---35120456933.pdf
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/3acddf76e5a1b70105814ac791aaea6f/tovitafamexumori.pdf
    • http://spoanalyze.com/wp-content/plugins/super-forms/uploads/php/files/160461736b619520f89ae168fc075250/14466159014.pdf
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/fgeh7gk8nd8g436mci5d0o2kkg/mojuzebefexi.pdf
    • https://lescourailleurs.com/upload/editor/file/25024767924.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=c%25C3%25BCz+harflerin+cezimli+okunu%25C5%259Fu
    • http://scripts.sil.org/OFL
    • 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_off0000dfbf.bin
4d83a70b29d721318bfb41e7e8b40cb9d7e8358b42def76821d54620e54c0a1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFBF 5248 bytes
font_01_sfnt_off0000f13f.bin
ff3160f1ebbd887451b55f5297a2863b3163d7566f4b5af3b66000e26befe284		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF13F 12744 bytes
font_02_sfnt_off000117df.bin
0ad16090d61ec13ed4c2f69078dc393f159cf4860fce5b6cb305120080e80def		 pdf-font-stream PDF embedded font (sfnt) at offset 0x117DF 16480 bytes

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