Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce8ba68c85c89cf7…

MALICIOUS

PDF

87.7 KB Created: 2021-09-21 21:32:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: f11e47fb79aa93610fd1540b828d17d3 SHA-1: 16c2e7c82d87c59fe66924642b6350217d4268be SHA-256: ce8ba68c85c89cf7ac2529cc592b3359e93db415b129bcb26053b7904f600e6d
196 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which appear to be part of a link farm designed to obscure the ultimate destination. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates the document's content is a social-engineering tactic to prompt the user to install a browser extension or update. This, combined with the ClamAV detection and ML classifier, strongly suggests a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://ketchas.ru/uplcv?utm_term=secret+bux+free+robux PDF link annotation
    • http://greensquares.in/userfiles/file///17111256167.pdfIn PDF document text
    • https://bluetact.com/ckfinder/userfiles/files/39527723269.pdfIn PDF document text
    • http://wenxuezj.com/images/File/futisuzes.pdfIn PDF document text
    • http://tivatijapan.com/uploads/userfiles/file/temabotulegumadamajosuba.pdfIn PDF document text
    • http://zekidilektekstil.com/images_upload/files/52996807198.pdfIn PDF document text
    • https://ksboutlet.com/file/files/momigejibagifosuxikeg.pdfIn PDF document text
    • http://monikaknoblochova.com/userfiles/file/nebuxenugugezivuxufis.pdfIn PDF document text
    • http://topbondtape.com/uploadss/file/15169206616.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/16215717839.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16136bbed8bdbf---40607482816.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3df6d90dc---69141388709.pdfIn PDF document text
    • http://di-tech.kr/fckeditor/userfiles/file/7076983129.pdfIn PDF document text
    • https://bearings.vn/images/ckeditor/files/kivedifakazu.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8337e2767---81218501198.pdfIn PDF document text
    • https://tahubunting1.com/contents/files/lidoj.pdfIn PDF document text
    • http://razzledazzleevents.in/userfiles/file/86196348052.pdfIn PDF document text
    • http://www.angels-rest.es/ckfinder/userfiles/files/36090784160.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/161357b84da450---dasibapokezosixesatu.pdfIn PDF document text
    • https://reparation-mobile.net/userfiles/file/30618816584.pdfIn PDF document text
    • http://sancheonglittletheaters.com/upload/userfiles/2021/09/files/210903230815.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/95398066350.pdfIn PDF document text
    • http://orderleesushi.com/uploads/files/logedozugejekolabovekozo.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/53780095726.pdfIn PDF document text
    • https://soalmatematik.com/userfiles/file/3646313.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_off0000f299.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF299 18632 bytes
SHA-256: 36ab416ae5d889363f1e11ed3ce5db8198390a2f736bccf30bb9781d12357d54
font_01_sfnt_off0001227f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1227F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013a96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A96 10176 bytes
SHA-256: eb67f78a39f2bf491befc9ab3237d00dbeffc42472863d7bdde2f15924a6879e

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