Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e1f51049a2485fc…

MALICIOUS

PDF

84.8 KB Created: 2021-08-17 04:41:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 093b8bf71f74f24ede71006883d6b9aa SHA-1: 6762dd8e4de8886d2d53188a9dcb5b7430513903 SHA-256: 2e1f51049a2485fc024d547b8c54b2227495bf810522824121601f89e26024ab
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to various domains, including those hosted on compromised WordPress sites. The presence of a URL with a 'utm_term' parameter suggests a potential lure or tracking mechanism, possibly leading to phishing or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://coretry.ru/uplcv?utm_term=world+truck+driving+simulator+mod+apk+free+download
    • http://rhoptik.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/voxajawobuvowag.pdf
    • http://cepsagibyachtfuels.com/images/photos/losukazevakowerenedi.pdf
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/d4170c0fa92b47109248464f24155bd9/42027793819.pdf
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16071fffa84c6d---fugejetatukasekupowox.pdf
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9291ece2f---jezixofab.pdf
    • http://werkkledingverkoop.nl/images/docman/files/2582655238.pdf
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609a1cafd0231---susivolapatuzo.pdf
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b357233bad---wobetuwi.pdf
    • https://bravo-hk.com/userfiles/file/83641842051.pdf
    • http://brezov-gaj.si/uporabnik/file/sidowexerenulonafobexa.pdf
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a38c307ee10---49139872788.pdf
    • https://www.axelendinggroup.com/wp-content/plugins/super-forms/uploads/php/files/89ca6b62430661bd08099251395d1e83/63911745748.pdf
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/drnbsn3bklg23ptb1dnkj6e54s/vowafubuzarebubewod.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607d71fd0e959---guxuwilel.pdf
    • http://kondicionery-domodedovo.ru/upload_picture/file/givevuz.pdf
    • http://eventcompany.org/clients/e/e3/e30ef11cf4efe639fe6592aa37b9cb94/File/ximadot.pdf
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ff5a13c50a---90209730579.pdf
    • https://luyenthitoeic.info/userfiles/file/fugudet.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c8851466589---99702937599.pdf
    • http://ordinate-ltd.com/file_media/file_image/file/75026909317.pdf
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ba21b523efe---vamisoludemefezunudu.pdf
    • http://sochi-riba.ru/ckfinder/userfiles/files/mutufusomapefogovi.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/b0bd5ca9ff66b86428b7e587524991be/bofosewewetamo.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7f66e7fd41---mejixunebemanodas.pdf
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160805b1b103aa---vavusenojuvumar.pdf
    • https://ruiguoex.com/upfile/files/2021/07/23/kuboforidaxopiwozugemeta.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_off0000e4ca.bin
492238719320ed33b8a4de315102c1b8ac7b42e06a5c6edf1957097a17a1a2c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4CA 11300 bytes
font_01_sfnt_off0000ff36.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF36 16792 bytes
font_02_sfnt_off00011748.bin
576a1f3a0e52148dc70a3a456d2f582d998aa0744df478f27c86fdd4033713bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11748 17264 bytes

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