Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f50f47646fea84a…

MALICIOUS

PDF

88.3 KB Created: 2021-08-07 01:56:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 26d580ff03c3572f38ccd1438b10d3dc SHA-1: 3ce81dc4c2adb5d6017295ae4aad80085654e338 SHA-256: 6f50f47646fea84a444ee8408b3e02fef0083b7c250860117cebf66054143e55
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document's content likely prompts the user to install a malicious browser extension or update. The numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggest a phishing or malware distribution scheme. No scripts were extracted, but the overall structure and heuristics point to a social engineering attack aiming to compromise the user's system.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://ontsgoi.shop/uploads/files/kumetateginem.pdf In PDF document text
    • http://bosch-service-center.ru/uploads/files/rakarumimiwep.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/5cbc9b0b0111c4bbdab2357791c72c8a/jixebejeniduxodus.pdfIn PDF document text
    • https://firmabudowlanawalczak.pl/web/uploads/files/84332632658.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/hgh61rufk9775p4sv297k88p82/temaze.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/6985p7t22mffd11ek0r03kr53i/tigonov.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/cbe5a7c49d4b750d5c8dadd0584e6f4d/17156000476.pdfIn PDF document text
    • http://suncreekpuppies.com/clients/8/88/88daaab1104cc9784d9cd8b59d189b35/File/nutoloxupiti.pdfIn PDF document text
    • http://coxfamilyreunions.com/clients/5/56/566bc9ad745482f371977770c3e6b383/File/ludexonubej.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/pasorepipijosogitamopefe.pdfIn PDF document text
    • http://lbhodgereunion.com/clients/3/38/38e1f81cb1ac74d12d86c8ba87866b9f/File/84372866011.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/c5face0360447f7f6143323b6a968cf5/63154679024.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16077ccb6b2600---vikiroj.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160949285c36fd---bugazoxumag.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/ecc61e8584c28adbee3268c813221a47/lelimudotinevidipifowudur.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071b4f679676---puxewidojuxujidol.pdfIn PDF document text
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/nojaxim.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1428d9adc---nukodomik.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/45v7irv7vn88pk8n39ggck6scr/kurikukipoketijuda.pdfIn PDF document text
    • https://hanakspotrebice.cz/eshop/ckfinder/userfiles/files/ketoxazisolixovefobivegag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+apply+for+pua+unemployment+in+texasPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF034 19628 bytes
SHA-256: 7a92c08194d87fd9d50702ad3285a872c09b0fdca955ae80830653fa3d4b4ee8
font_01_sfnt_off0001226f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1226F 10912 bytes
SHA-256: a77434333dacd4010fc3aec1b2c7463bcecda54dbbe86f27e62c93979535510a
font_02_sfnt_off00013bc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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