Malicious PDF — malware analysis report

Static analysis result for SHA-256 f42306b54d36a2d7…

MALICIOUS

PDF

72.1 KB Created: 2021-08-09 18:41:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 40d240b6b0263574fd068545411c44d2 SHA-1: eca5b6c6c0face5f3eb3b74d906e6710d59f2d57 SHA-256: f42306b54d36a2d733144accdb6b5f9648dd0dfeb388e824e0484690eca910cf
94 Risk Score

Malware Insights

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

The PDF file contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, indicating a link farm designed to direct users to potentially malicious content. The ML classifier also flagged this PDF as malicious. The primary attack pattern involves luring users through these links, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8991

Heuristics 4

  • 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.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607609f133baf---79145138097.pdf
    • https://ms02bet.com/contents//files/74723998120.pdf
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/afplck400atgihh0euofl0fh7o/xikurinapolawazadusanu.pdf
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/nkknnc9bo7v32qv6mkk2a8i6f2/pesupeliru.pdf
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a448c8ef5d---fetabovuv.pdf
    • http://iberryhomemade.com/userfiles/files/bivozafulafedap.pdf
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/5757976bad7b82cc43886a7b489cc987/pijajamalukixutunikuke.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160937541383c7---wopitijidirapus.pdf
    • https://digireg.cz/upload/80783158080.pdf
    • http://starlightcelebre.org/clients/4/43/43e9139217482d7666ce300faf566241/File/putavurewubadajibemurufe.pdf
    • https://ladulceseguros.ar/noticias/fckeditor/file/10196891986.pdf
    • https://alperbehang.nl/userfiles/file/gizukorabimidabubopenakov.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1c2c65b3d9dccd127e2072c1b6b38026/kakidadib.pdf
    • http://collectifff.be/imgdb/accueil/files/vidifamatuvak.pdf
    • https://medicentrumnz.eu/medicentrum/files/file/nokegoduxatodezomirunofe.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16083cd006b9be---jadeleletu.pdf
    • http://prime42.ru/userfiles/files/xokepimezirakawero.pdf
    • http://ndt-ultratech.com/files/9328079203.pdf
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/bt7vpnugbsu9372erdj7o35jtf/rawunoximivogijibo.pdf
    • https://5uempat.com/contents//files/16315547711.pdf
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/16090f1f6bd81b---56245628191.pdf
    • http://bienbao.net/uploads/files/walidubebefiwor.pdf
    • http://technology-mp.it/userfiles/files/nafafeva.pdf
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acdb6314413---74163839837.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=problemas+de+sistemas+de+ecuaciones+2x2+metodo+de+igualacion
    • 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_off0000ef94.bin
ee3d20bba004abf6382e0a02dde682308fe6309e67a7a5ad53198db8da8fb181		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF94 11176 bytes

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