Malicious PDF — malware analysis report

Static analysis result for SHA-256 ece4e12dfc778946…

MALICIOUS

PDF

76.5 KB Created: 2021-09-11 06:16:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: add5d10625e12abff65524665d1fb018 SHA-1: 68af3eef294788293faa4c67b7bebbd2de13e106 SHA-256: ece4e12dfc7789460027813c9f13b9be3a67f609e6f9bd98f1e85f231dfed5e5
156 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links to external websites, many of which appear to be part of a link farm hosted on disposable or compromised domains. The primary purpose seems to be directing users to potentially malicious content or phishing sites, as indicated by the 'link farm' and 'phishing' related heuristic names.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://coretry.ru/uplcv?utm_term=crossfire+legends+game+download+apk PDF link annotation
    • http://superlitefan.com/uploads/files/regovowipudazogifezid.pdfIn PDF document text
    • http://abwrosedale.com/uploads/files/remobusim.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/87816413969.pdfIn PDF document text
    • http://gvs-russia.ru/admin/ckfinder/userfiles/files/valutaxuxukofok.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16132d3d1928e3---xanixuwunezadikonake.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/99651045659.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/28052702343.pdfIn PDF document text
    • http://art-ball.net/files/file/41721727142.pdfIn PDF document text
    • http://thumpamonpally.com/userfiles/file/kutozitelotokuxinaki.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613032e1c8e53---jetaxudivabewufefev.pdfIn PDF document text
    • http://dienlanhlongan.com/upload/files/menipimuxarugug.pdfIn PDF document text
    • http://fygl.net/uploads/file/090145322391.pdfIn PDF document text
    • http://graczeonline.pl/userfiles/file/68300981051.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/42565195794.pdfIn PDF document text
    • http://seghers.kr/data/editor/file/17057815686130a3e5f1de4.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161309330ee18e---kamevasarexafiwotujajo.pdfIn PDF document text
    • https://cincia.ro/ckfinder/userfiles/files/67765838726.pdfIn PDF document text
    • http://sial.pl/galeria/file/26513966687.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/df189110aef062e3d20b8e020249a3e7/kilogaxuvelus.pdfIn PDF document text
    • https://srccaa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/10543330770.pdfIn PDF document text
    • http://mintaialuminum.com/d/files/paridivoligunalegilemux.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/31964773948.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/161341cf20fa53---xalivuxovi.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/538868692.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_off0000bed3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBED3 10952 bytes
SHA-256: 163793e4de4260166b387553260a89c4eb17e5daf20219be11621346d8a791a2
font_01_sfnt_off0000d808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD808 20048 bytes
SHA-256: f951ff1e2a62117abf16315be1855d65a6fa5d3afeb25c46aff91e61903bc9ba
font_02_sfnt_off00010c17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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