Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3953b31824e12ac…

MALICIOUS

PDF

85.9 KB Created: 2021-07-16 08:58:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 706f568ab6e7fbd2593ee9561df13037 SHA-1: e1e708afb8c807e02f9676c61c66f7e7105a669d SHA-256: e3953b31824e12acbc88be096e6c5f1d3535763d45573ef60ae8b508cc768ea7
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDF documents. It also features a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to obscure the final malicious destination. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely involving phishing or the delivery of a secondary payload.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4833

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/jtah9pisa10qo8k0mb0rded4cu/51275070942.pdf In PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/q4vf70n6ene2jsj3jbbvmvbo1m/38808254199.pdfIn PDF document text
    • http://jucal.es/images/file/89842455551.pdfIn PDF document text
    • https://olmitek.by/wp-content/plugins/super-forms/uploads/php/files/ac2lfijlfhbu7on3bjvfvqits5/18279361099.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b97a93d319a---20149419208.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/a0540c19ec0449babc939059a9601e98/lopobiva.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b38c75727f1---kipenugij.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160ec533ab35cd---xikerilodugavutix.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/murerokof.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd5300ae1ed---51810724540.pdfIn PDF document text
    • http://praguetransfer.com/files/file/21962115977.pdfIn PDF document text
    • http://zaragozalawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/ditovigimu.pdfIn PDF document text
    • http://gurukripapublicschool.com/userfiles/file/74843004640.pdfIn PDF document text
    • https://akonis.ch/userfiles/files/gebasebukitawekerumivetev.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/16157781676.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/daritemuxolixuzuvifopo.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/1dhi9uu7uh51fc54fh8jgbr8j3/203129804.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba1b9585dd2---82152327197.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ad12a5e136a---39320336234.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/72573454473.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4120466b9---89289478771.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/v0h8g96rl4mfq4aqrrudci29p9/538501939.pdfIn PDF document text
    • http://kaowei.tw/image/files/20210528_101204.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/c0b3f890ccfdee475bceb3c03280a0bd/waratolilidujawer.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=introduction+to+natural+language+processing+pdfPDF link annotation

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