Malicious PDF — malware analysis report

Static analysis result for SHA-256 307aef0386b9ff1b…

MALICIOUS

PDF

81.8 KB Created: 2021-07-02 19:44:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1597c3f1194a77df44da8536ee2d6b0c SHA-1: 0b2a9e666d51969336a97f7241f43eb6df7cb4a9 SHA-256: 307aef0386b9ff1be1ea36787c91944b291038103faee0e3c757de78074d442c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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, directing users to multiple external URLs, many of which are hosted on compromised WordPress sites. The presence of external URIs and link farm heuristics suggests the document is designed to lead users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://infrive.ru/uplcv?utm_term=state+newton%27s+first+law
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160886837aad96---34443369381.pdf
    • https://foundryindia.org/userfiles/file/lozosorajaredage.pdf
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/mj03hj8ra5v6jpt8r6cit8u4h4/sozow.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eceb9c8b56---fozutuvinokexajixuvunit.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607a45ec073c8---fegulokubexonov.pdf
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16076e53616ed3---73226003366.pdf
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/4riqebnqm9oo2dekm0pe02vptm/46480919239.pdf
    • http://bjaimama.com/data/upload/2021/05/file/202105251209242400.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8d24f1fc42---85308777515.pdf
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/je9tva502mfq6k3ie4vaigtk0e/fokewududonaf.pdf
    • http://suamayin.biz/userfiles/file/13038466062.pdf
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a95f92365cd---77061604265.pdf
    • http://telegid.tv/userfiles/files/sidofobifadafanow.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f7ab0f23f---36326517544.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075385c9c32d---xomuxatosubulaxigagesoke.pdf
    • https://alrashed-alsaleh.com/userfiles/files/vafolupejefoxarekuwav.pdf
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/76222055755.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a1cf26764d4---zifuz.pdf
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/8a6677732dae70512a325d8e38dbc98f/pebigonopopomita.pdf
    • https://unosms.us/userfiles/file/25814112067.pdf
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/2e0a1ff951290c87fd7b9fe549ab126b/42134005120.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160dc9f024620f---kirimekagiref.pdf
    • http://braciszewska-klimek.pl/fck_files/file/13499666169.pdf
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/0qpo26dk1kpq3ivhgtb5gqun05/kadarides.pdf
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098c8a7eb366---duzibex.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ff94cf6c3---siliguzujiv.pdf
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/weziwuvupenerufasexomokuv.pdf
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/865dd65a99c7d64b00c37542dcbbc609/bomanogolajof.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_off0000dcd8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCD8 16792 bytes
font_01_sfnt_off0000f4ea.bin
fdf2035f4672cef51ed9f16a9381bac8e36508c78c243afbef5226c598425a95		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EA 17380 bytes
font_02_sfnt_off000121e9.bin
37b5956af0a62e19f59441ef4027f525a140911203ad13a6077ec6d6860085ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x121E9 10400 bytes

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