Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b93ca193143f939…

MALICIOUS

PDF

83.1 KB Created: 2021-09-11 15:52:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7f19883955e93b6cc418edacd227f8b5 SHA-1: 36b952ef13454dfcf305043f852ef38fe27e4889 SHA-256: 6b93ca193143f939d7ce7b4b40bd1e365c9a3ee7162ffbf42cba31c7a31882ba
196 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document's content is designed to trick users into installing malicious browser extensions or updates. While no scripts were directly extracted, the presence of numerous embedded URLs, many pointing to compromised or disposable hosting, suggests a phishing or malware distribution attempt. The ML classifier also strongly indicated maliciousness.

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
  • 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.
  • 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://www.gieskestukadoors.nl/ckfinder/files/files/bajemawewimaroladekajiw.pdf In PDF document text
    • https://kcss.hu/korosi/userfiles/file/13314903219.pdfIn PDF document text
    • http://phongkhamthienhoa.vn/images/files/sedibujoxadawibilebix.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///noromilinu.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/fejim.pdfIn PDF document text
    • http://cke.hk/userfiles/turubigutasuruna.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b46ca97c96---99319517495.pdfIn PDF document text
    • http://maroba-zirndorf.de/file/repowijiwinipaxeluwivitix.pdfIn PDF document text
    • https://hediyelikhanem.com/calisma2/files/uploads/todotopevu.pdfIn PDF document text
    • https://www.pirkitpadangas.lt/ckfinder/userfiles/files/7113610217.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba2806838c---pevejekedepunonalugiv.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133787824aeb---garobemikuwadotix.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613532e17b518---67683138506.pdfIn PDF document text
    • https://xn--49st2et51duvk.com/upload/files/72160123148.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613319f14e487---58447569951.pdfIn PDF document text
    • https://autopits-directo.migrupoq.com/ckfinder/userfiles/files/dadomesirimolu.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613230f458f5f---67401507891.pdfIn PDF document text
    • https://spirit-legend-enterprises.com/webroot/editor-uploads/files/jubarimixovu.pdfIn PDF document text
    • https://serrechevalier-skifun.com/imagesfile/nigijalo.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/15568642770.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130f5a3b4aaf---21387388993.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/161338e035ffe2---wawuvazusoses.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=telegram+video+profile+picturePDF 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_off0000dfce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFCE 10820 bytes
SHA-256: 019fa37a8127333abb2a0c96fe3290fff789bf6c50677f78030d240ba6184dc7
font_01_sfnt_off0000f899.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF899 18220 bytes
SHA-256: e361092de09ecde601e1a103d3572341661e23ff661ac816bf50251cc3d12428
font_02_sfnt_off00012726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12726 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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