Malicious PDF — malware analysis report

Static analysis result for SHA-256 c463e8892afb8267…

MALICIOUS

PDF

83.9 KB Created: 2021-07-20 05:52:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 29b6201a77f2106491264e751c0b9c12 SHA-1: 266428d12d1926839147d09301bdd9c80d0f93f0 SHA-256: c463e8892afb8267b9d2fd121eedc7a8ea6a4bb9550b8109980fbf28f9bb453b
204 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous links to external sites, many hosted on compromised WordPress installations. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document likely prompts the user to install a fake browser update or extension. This behavior, combined with the ML classification and ClamAV detection, strongly suggests a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://aldea.work/wp-content/plugins/super-forms/uploads/php/files/b19904199a2051a81eda112449a7c524/mesemuk.pdf In PDF document text
    • https://baxsporthorses.nl/userfiles/file/22216103229.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/78936775256.pdfIn PDF document text
    • http://thy-environment.com/userfiles/files/maluko.pdfIn PDF document text
    • https://mujeresenmovimientoplus.com/userfiles/file/fudugenetebofusoje.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/4d4e90ede102d74e11d013f18778b528/jetolevazomefeselawuvu.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/adfumcja3mg0il1hqrqasu62hp/sujesewekafuneludowenewo.pdfIn PDF document text
    • http://ozona.pt/wysiwygfiles/file/92947927938.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/faxer.pdfIn PDF document text
    • http://paliukenas.lt/i/File/5609692433.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/1158870350.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/bipog.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/zerimuraxovexobo.pdfIn PDF document text
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/badunesa.pdfIn PDF document text
    • http://cnzgks.com/userfiles/file///39778293805.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b67312610---13958047049.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/59t4f02uqpvk0faq91cq1rq5a2/zumalukopusekijud.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b5527754bea---52888164624.pdfIn PDF document text
    • http://efuturesthai.com/uploads/file/dafozotogujosojewasop.pdfIn PDF document text
    • http://standardamulet.com/files/files/97416160330.pdfIn PDF document text
    • https://ancoraeducacion.com/images/nezuxepolofi.pdfIn PDF document text
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/3e0554949a1137a560905a21e3db6d4e/kesojatenopamig.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e32096ebf8---53224671505.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2ac1acb761---ziwifazodenuvefarupat.pdfIn PDF document text
    • http://guowangcable.com/d/files/38101675816.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/f853e764a3a4a8d86a54ef53af06f554/zuwelevemenevuzij.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/2682f57a90bc3580b503d17a53729a91/34837335016.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=font+paste+and+copyPDF link annotation
    • 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_off0000e68e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE68E 16968 bytes
SHA-256: 4d11ebdbf071d94d0ae89f3905e997d1655afec36167a1ffadd959eaab1d2f9b
font_01_sfnt_off00011293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11293 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012aaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AAA 10360 bytes
SHA-256: 94f731ecf35d6a0cd108d5bd836d32b290e12918d7fc8a7693776a7a5f59fd7c

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