Malicious PDF — malware analysis report

Static analysis result for SHA-256 50b10072c940d471…

MALICIOUS

PDF

84.1 KB Created: 2021-08-25 14:59:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 4655ae7e0adaffaebe6b79d872348b6b SHA-1: c75071cba8b65d31db2408f7716f05841207a7f4 SHA-256: 50b10072c940d471f8d320c38844f2597a23ff30f5c1b91fd86537839153740f
196 Risk Score

Malware Insights

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

This PDF document is flagged as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan attempt. The heuristic 'SE_BROWSER_INSTALL_LURE' suggests the document's primary goal is to trick the user into installing a fake browser extension or update. Numerous URLs extracted from the document, many hosted on compromised WordPress sites or disposable domains, likely serve as download locations for malicious payloads or further phishing stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 7

  • 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.
  • 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://krisoc.ru/uplcv?utm_term=past+participle+of+did PDF link annotation
    • https://coebmsf.com/userfiles/file/57769502818.pdfIn PDF document text
    • http://fzsvybbs.at/userfiles/file/sunefaxekora.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/blqtj1i39krqnbnps1eh51qfk5/1490903392.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160873b847971b---36634922033.pdfIn PDF document text
    • http://3e-machinery.ru/app/webroot/filesfiles/wulamirunezoxega.pdfIn PDF document text
    • https://hantverksakuten.se/ckfinder/userfiles/files/pamosonemo.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/15587337914.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd7c675d12---melusifeto.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/234f65d5ef9fbda41b65e9df8d1c2985/98713489256.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/tatogulok.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073b46b0a5a2---25148469156.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/86819307175.pdfIn PDF document text
    • https://melz-feu.ru/upload/84555390187.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/579dd18f866de19feeb26dd4f52d7b7a/16607539881.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/bbec42f8bb948e94ebd76856a77eb836/sewawo.pdfIn PDF document text
    • http://krzeptowski.pl/file/mivijasosesilonopu.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/78121952095.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a641c253613---23120207744.pdfIn PDF document text
    • http://skikk.nl/app/webroot/files/userfiles/files/gebopomimuvewakejeb.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/64670552935.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/zebiwuputa.pdfIn PDF document text
    • https://immo-cjeanpaul.lu/userfiles/files/35595078222.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/jidp354g9291r0101ckmehks2i/16148781148.pdfIn PDF document text
    • http://kondicionery-fryazino.ru/upload_picture/file/39530186560.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_off0000e592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE592 10508 bytes
SHA-256: a93aa9998a4b2d15c75bb8a3ad9db7b422180d6df9d2db662fcf2a32c67be650
font_01_sfnt_off0000fd9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115AE 16968 bytes
SHA-256: daebf63751a8c3ff806cfccb8e06500972f3ef7829dd8eb74adadaec9db8ae89

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