Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d3e6de6afa23eb7…

MALICIOUS

PDF

65.1 KB Created: 2021-09-04 06:50:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a444c729e787ea1cf992e97f7a87743c SHA-1: 0a73d81a8629f59ddfee0cb13bdac41d14d7b802 SHA-256: 8d3e6de6afa23eb748ad37ac878ba1e4b9180d577b125937b78da82814744306
132 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting vulnerabilities or redirecting users. It also functions as a link farm, pointing to multiple compromised WordPress upload directories and disposable hosting sites. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a malicious intent, likely to lure users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2621

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 http://epoch-making.jp/js/upload/files/66293616206.pdf In PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/sutesefoxet.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/37uf1sorbmq1m48kvb08jd8v01/1581361026.pdfIn PDF document text
    • http://namngonviet.vn/user-/files/87171706181.pdfIn PDF document text
    • http://nhagiatxanh.com/public/default/ckeditor/files/24552640241.pdfIn PDF document text
    • https://southwestlooms.com/admin/userfiles/files/lesobopi.pdfIn PDF document text
    • https://principesgs.com/userfiles/file/sikamufinujufipiwik.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/4bc83b68bd5f9780babb120e71b4f168/78806302342.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/ab8b02038e72dadbdf277dd2e71de9d5/raxoxoxekilunerukorozoluw.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16078e01e7cfd2---refube.pdfIn PDF document text
    • https://www.meditech.cz/ckfinder/userfiles/files/5204795580.pdfIn PDF document text
    • http://www.cpiequipos.com/assets/images/user_files/files/2635110800.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160962e8377536---7162885376.pdfIn PDF document text
    • http://eventechsite.com/files/files/70994648416.pdfIn PDF document text
    • https://evermoral.hk/upload/file/1625428300.pdfIn PDF document text
    • https://aluminiosarla.com/userfiles_arla/files/vajuzanelesen.pdfIn PDF document text
    • http://studiotecnicoligioni.com/userfiles/files/41300607859.pdfIn PDF document text
    • http://www.integra-cr.cz/administrace/ckfinder/userfiles/files/lewasofiwuzinapapekana.pdfIn PDF document text
    • https://lmetinternationalschool.in/ckeditor/ckfinder/userfiles/files/17229298175.pdfIn PDF document text
    • http://vudafrique.com/wp-content/plugins/super-forms/uploads/php/files/387dcddb124e38589200cdcab541573b/diguruxiruxe.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/zenovuk.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aaa6549a929---zukazazugerifenu.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/a9e20ca47ee1abb9e8af5986127dd432/36913017473.pdfIn PDF document text
    • https://marosme.ro/hirek/file/telavema.pdfIn PDF document text
    • http://tajesink.com/Uploadfiles/files/96729294391.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100134f39455---92860020068.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/xolulatinekifatugojoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=forms+of+energy+worksheet+the+need+projectPDF link annotation

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