Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cb95e8b42ee657b…

MALICIOUS

PDF

80.7 KB Created: 2021-09-20 02:58:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2979f02b96ffe28156170b65d92bd19b SHA-1: 1f01395313a6d445eb9277147a9077519d9d7bd5 SHA-256: 2cb95e8b42ee657baa15e6998835ac4018188d2aacdc8260762a80ccbd4248df
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farms indicates an attempt to lead users to potentially harmful sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://queure.ru/uplcv?utm_term=react+native+nested+scrollview
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/934e6e26eda7448535444fab6c88de23/mejajiluzupubu.pdf
    • http://inercial.es/uploads/files/43031195936.pdf
    • http://tiga.co.th/ckfinder/userfiles/files/makizomatifedid.pdf
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/161414d7d1eec2---40531766132.pdf
    • https://stalbeckers.nl/userfiles/image/file/61601946447.pdf
    • http://pallenberg-busreisen.de/uploads/files/govogafobemafulapuveguxe.pdf
    • https://kalashad.com/userfiles/file/56988989516.pdf
    • http://nhatngungoisaoxanh.com/upload/files/16261175022.pdf
    • https://goez1.com/10005001208290177/ckfinder/userfiles/files/90132981796.pdf
    • https://jerseyshorepirates.com/userfiles/files/35662173749.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613504260bc6f---61739772184.pdf
    • http://urgentcarepb.com/userfiles/file/75860572890.pdf
    • http://selidbe-beograd.info/files/44709373044.pdf
    • https://www.agencesramos.com/ckfinder/userfiles/files/61382179951.pdf
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb07c731ac---jifutiluzagaxex.pdf
    • https://die-elke.de/cms/elke_page_files/file/62626618365.pdf
    • http://serting.eu/userfiles/files/jabosejujoka.pdf
    • http://vilocom.net/webroot/img/files/57242591688.pdf
    • http://beiks.info/public/file/bapojo.pdf
    • https://divetechmarine.com/contents/files/jopakerejaneresudazeka.pdf
    • http://sushiyaslo.com/uploads/files/gepijafikafabeninip.pdf
    • http://hotelclinton.it/userfiles/files/3062870558.pdf
    • https://iagclaims.endataclaims.com/ModCoreFilesUploaded/file/57004672562.pdf
    • https://muachungbaohiem.com/uploads/userfiles/file/xugadumakesatemopexarej.pdf
    • http://chono.mn/uploads/userfiles/files/zudubininowenozu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6c6.bin
ab99b32ec132f49e8268d88ddfad15b1fcadeaab1fba1f64bef92b7ccdfce42f
pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C6 10560 bytes
font_01_sfnt_off0000ef09.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEF09 16792 bytes
font_02_sfnt_off0001071b.bin
cb953444eec5f064c4166a9770e5c696b1eb6f511115bb699257a48952cd4d1e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1071B 17632 bytes