Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b25f70127b5b305…

MALICIOUS

PDF

75.6 KB Created: 2021-09-13 14:45:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d93fe28dd562f0f020618429eb89c338 SHA-1: 9aaa326a6d0dcb069dd45b5cd28f7e6fdb812280 SHA-256: 3b25f70127b5b3057aba299468c30c92f5d44e1916cd20a2b47f0db012c8d9d8
204 Risk Score

Malware Insights

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

The sample is a PDF document that contains embedded JavaScript and a link farm pointing to potentially compromised WordPress sites. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document likely attempts to trick the user into installing a fake browser update or extension. The embedded JavaScript and numerous external links suggest an attempt to download and execute a second-stage payload or redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb62a0ef05---37581352846.pdf In PDF document text
    • http://khyljg.com/uploadfiles/files/ganidikaloxusumukopo.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/kisuzebukagaliwigowijik.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5b084c360---29135214903.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161347cce8d550---jober.pdfIn PDF document text
    • http://mundori.com/js/ckfinder/userfiles/files/46542569895.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/1f5e3bae7fe0cb70c939a7a8c2fa07ba/90577138022.pdfIn PDF document text
    • http://wellnesszeewolde.nl/site/data/ws/files/sutujonigegidasiwazurupe.pdfIn PDF document text
    • http://shceping.com/upFile/photos/2021-9/file/tegigukokov.pdfIn PDF document text
    • http://madveras.com/ckfinder/userfiles/files/6553182222.pdfIn PDF document text
    • https://torbay.ru/images/uploads/file/babekunosevopuvomug.pdfIn PDF document text
    • http://kevinmcallisterlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zefowikolepow.pdfIn PDF document text
    • https://ijaetis.org/ckfinder/userfiles/files/12514933870.pdfIn PDF document text
    • http://nationalcoopadvisors.com/userfiles/files/66690170187.pdfIn PDF document text
    • http://iccarrentals.com/files/file/runajovogomube.pdfIn PDF document text
    • http://cadeco.com/testingsites/advantage_aviation/assets/media/file/24186080326.pdfIn PDF document text
    • https://fulzugaskozpont.hu/files/17308346366.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/f8cee571a9ab6db0d4cc36d8c82c0f82/9483279565.pdfIn PDF document text
    • http://vitrine-prof.com/files/23745251770.pdfIn PDF document text
    • https://coimbatorepressclub.com/FCKeditor/userfiles/file/larisefaratubulukaf.pdfIn PDF document text
    • https://estduquebec.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/46293925938.pdfIn PDF document text
    • http://taiwan-tsai.com/upload/files/wirarifuzinenanol.pdfIn PDF document text
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gakom.pdfIn PDF document text
    • http://darslaska.org/ckfinder/userfiles/files/25035062333.pdfIn PDF document text
    • http://associatedreclaimed.com/userfiles/files/jutobobafasesanezutukipe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=ptcl+smart+tv+android+app+crackPDF 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_off0000c614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC614 10700 bytes
SHA-256: f30df701e3a813b89d990b317b5fd1ec0ffe13834efbc526a0b4fa97ea823ff5
font_01_sfnt_off0000de9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9F 16308 bytes
SHA-256: c7f3b8077325e5ecc773e2457b110a24e963b2b67c1cba5950d99d21b2db0264
font_02_sfnt_off00010880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10880 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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