Malicious PDF — malware analysis report

Static analysis result for SHA-256 84e809ee7e5259fd…

MALICIOUS

PDF

85.1 KB Created: 2021-06-25 23:53:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: f1ae57cc4575cd300a3daebf44d8f1fa SHA-1: d043adbb5d5be5cfed8f19706536bb46e5412693 SHA-256: 84e809ee7e5259fd3c71e3d8fc9a8fd0508c6d997c620ee7789b04e1f1e29f4c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many of which point to compromised WordPress sites or disposable hosting, indicating a phishing or malicious redirection scheme. The ClamAV detection and ML classifier strongly support its malicious nature. The embedded JavaScript likely facilitates the malicious activity, such as downloading further payloads or redirecting the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://irlanc.ru/uplcv?utm_term=active+noise+control+systems+algorithms+and+dsp+implementations+pdf PDF link annotation
    • https://repare-ton-smartphone.com/userfiles/file/kifenotopan.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/be5f322cd1a9f112f8a17f6d492cc791/tadozag.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160c3709f554fb---40559552106.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/c230e1b8a366851615c3c9073ca2ce55/42593661514.pdfIn PDF document text
    • https://sfasg.jp/js/ckfinder/userfiles/files/pupuwolitu.pdfIn PDF document text
    • https://appfacile.it/file/zapemibave.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/16085645d4a6cb---29982112352.pdfIn PDF document text
    • http://branpc.in/ckfinder/userfiles/files/46944279073.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/4928046ce63b840f2c55c0088ae4e90b/vomokurepurega.pdfIn PDF document text
    • http://monktonlionsclubkidscamp.com/clients/9/99/99b8b5517e5fb663501b7ee5137ebf55/File/32503420443.pdfIn PDF document text
    • http://homespakistan.net/magzine/uploadfiles/file/waduvarawimeritufatoboru.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/p3pssir11dameoot8ggia7pev3/40650327742.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4af72ebb3---94146672108.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe2ccb4962---83860137627.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/16078d6f044357---rizogifizuliwigix.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/bibixa.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/60ea72001641121a317fe211473c16c9/finiwebelelowesajimigubo.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608038b3cea0b---deziv.pdfIn PDF document text
    • http://ezibra.pl/upload//file/zovelij.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/84083998835.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/suxifiwiniwuwula.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607edd4b61a3e---fovumexiwatelozav.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • 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_off0000e449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE449 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC5B 17420 bytes
SHA-256: aadec4c79f15260de0f49fa5baaa477e27d80bdc8fb900af3ad3d27b47b60d88
font_02_sfnt_off00012a0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A0F 11228 bytes
SHA-256: bd1b21cf6a6dcaad3f2f796d19ac30bd61daf3839952e62dbb84ca4765ba5e73

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