Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff24093c2563bca2…

MALICIOUS

PDF

92.9 KB Created: 2021-08-04 00:57:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0612adaaa5e313872aba11f32f005e7f SHA-1: 87137420f7d2af254c3d00c3177a24ac9f82eed4 SHA-256: ff24093c2563bca2e18a1b5c3bfc1a554a5bbd808f742d7111d45479694e9e3f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and flagged by an ML classifier. It contains embedded JavaScript and a link farm pointing to multiple compromised WordPress sites and other disposable hosting, suggesting an attempt to lure users to malicious content. The presence of embedded JavaScript indicates potential for further malicious actions, such as downloading additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 7

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://nedirajtebosnu.net/userfiles/file/67468123660.pdf In PDF document text
    • https://cezartravel.hu/userfiles/file/16294268347.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/3b9602bd23c775aa8e292f751f4fc14d/25809288645.pdfIn PDF document text
    • https://elegune.net/files/galeria/files/bozoj.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/16086c4d152023---12349540694.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/46728172686.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/f1necsmvmi0d62jmk3hq0uj994/nejetasod.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/76020e2o6ce831u0j39dc4qs5r/bijerujil.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/e717dcbf58d76b5fe2592233049563cc/3252287565.pdfIn PDF document text
    • https://tempatpasang.com/contents//files/gejimipipu.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/83826985087.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/rirapovarevukekozalaf.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd05a4a345---85398173233.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/25984428457.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/1e7f8a880372fc998c561f3e4e57fe01/mitarigibituzud.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baf747733f1---memawiriko.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609164ba7c9ea---48784211444.pdfIn PDF document text
    • http://pkpneu.cz/userfiles/file/20940760747.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/da68e27dfc1acd7d1fdcc6cf9d674b3d/rigozekasimizupete.pdfIn PDF document text
    • http://imailbox.nl/images/uploadedimages/file/67581332927.pdfIn PDF document text
    • https://www.sacda.org/wp-content/plugins/super-forms/uploads/php/files/ie9sun2sij8ep93n5c2chrb405/37118842341.pdfIn PDF document text
    • https://biogenetixpharma.com/ci/userfiles/files/ninesonavawejonawiba.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/38604925191.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=oracle+reports+6i+pdf+arabicPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010ef1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF1 10840 bytes
SHA-256: ab614a891c15fba07b3fed463506386cb5ffbe7b63fd188769a30024007f1a43
font_01_sfnt_off000127e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013ff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13FF7 16996 bytes
SHA-256: e406d6bad02c94061365cade1c7c0e6c1cf42079522226c9eafc245d19e372c8

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