Malicious PDF — malware analysis report

Static analysis result for SHA-256 37fbb46c0c72f02b…

MALICIOUS

PDF

69.0 KB Created: 2021-09-14 10:19:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c2e11a24995a99fbfd4f7188c0aaf3fc SHA-1: 5fc358b46b705950d480ca5bde309fa699a5ba42 SHA-256: 37fbb46c0c72f02b20d2bf05a8ce38444faee6631b190f7beb76ed913554dd41
204 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and multiple external URLs, many of which are hosted on compromised websites or disposable domains. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document likely prompts the user to install a browser extension or update, a common tactic for malware delivery. The embedded JavaScript and the nature of the URLs suggest an attempt to download and execute a second-stage payload, likely leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://infrive.ru/uplcv?utm_term=download+all+missions+of+gta+san+andreas PDF link annotation
    • https://livnica-metalurg.com/images/pages/file/xomopepugopisimaz.pdfIn PDF document text
    • http://briztravel.com/upload/files/36818635021.pdfIn PDF document text
    • http://gmicropilotes.com/uploads/files/31433029958.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/jiguvafobubijid.pdfIn PDF document text
    • http://astprom.ru/sites/default/files/file/korutivo.pdfIn PDF document text
    • https://woft-dining.com/webroot/editor-uploads/files/22269641595.pdfIn PDF document text
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/xufefo.pdfIn PDF document text
    • https://kaemsp.org/upload/editor/file/ruxejojuvurukezebitu.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613f2b97e2b39---kazokevezefekedefasadave.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/6dfe255e2b88550772558330e72cbf22/7341060614.pdfIn PDF document text
    • http://sun-marche.com/app/webroot/js/ckfinder/userfiles/files/31731075224.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/54736341449.pdfIn PDF document text
    • http://huspanda.com/data/ckfinder/files/3405680049.pdfIn PDF document text
    • https://apexsafetyproducts.com/ckfinder/userfiles/files/14725349066.pdfIn PDF document text
    • http://pes.edu.mn/ckfinder/userfiles/files/milula.pdfIn PDF document text
    • http://sentezetutmerkezi.com/upload/ckfinder/files/bemavetorosamipew.pdfIn PDF document text
    • http://arredamenticucinesiciliane.it/userfiles/files/15076269569.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-4/20210904025324895385.pdfIn PDF document text
    • http://dominopark.pl/public/upload/ckfinder/userfiles/files/xegesitimujifolonipiteza.pdfIn PDF document text
    • https://ipekyolumedya.com/resim_galeri/file/sozusabox.pdfIn PDF document text
    • http://hkwwta.org/userfiles/20582402230.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/161333361d725f---75020967938.pdfIn PDF document text
    • http://davcpundri.com/css/file/jumenugijezonidewumasedad.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_off0000addb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADDB 16320 bytes
SHA-256: c2005f7eb62111c64f259770e4e7bb59730fa3a5bdee5e8b10059fe006bd34f2
font_01_sfnt_off0000d5dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000edf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF3 10784 bytes
SHA-256: d0c1040107878108cbb31bd0900e446f331503aa9b13b7810481e5fda3258dac

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