Malicious PDF — malware analysis report

Static analysis result for SHA-256 173e5e42d0555653…

MALICIOUS

PDF

92.4 KB Created: 2021-08-20 19:43:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cf85d190160754437f27e008eb5feb95 SHA-1: e204931dae6cc6c57cc4e775c212f3ded1aa301f SHA-256: 173e5e42d0555653f5d8e78c1c873fa2e1e0f472cde01709db1d73ef6bd9558a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised CMS upload storage locations, suggesting an attempt to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of numerous external links indicates a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://smaransaving.com.np/ckfinder/userfiles/files/51615386383.pdf
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/47fe615fa7886f4e7e157291c8dcbb9c/20712520729.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160943db3bf434---93692254846.pdf
    • http://latexindia.com/userfiles/file/vogabefovoxinujefaju.pdf
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/8537c24b4e9bf4c6d4875efd6cbc5e21/wetubitakaxem.pdf
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/n8ho0ib6gv9gqefialpuq70k3u/nimogedireperuvefikijoz.pdf
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16071b4e8267f1---mikapojiposasuzilagokezif.pdf
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607cad9cac558---pipuvitipimosibuxukiw.pdf
    • https://winpoasia.com/ckfinder/userfiles/files/63395371608.pdf
    • http://bacsiha.com/public/ckfinder/userfiles/files/taxovanijitu.pdf
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/iapnp56imkokcq4jf5cngkd4bs/88494000046.pdf
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16111d6025b0da---zafafeziniguwelepato.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cde4d146308---vojofawet.pdf
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/b25bc4047430ecfff2ea7594e1962269/miwudiwomowudesuzozilu.pdf
    • http://vallovin.it/userfiles/files/luvasefenewukisukewew.pdf
    • http://fenotropil.ru/userfiles/file/wunojor.pdf
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/s9htvbcd1eaig94e26citip402/zabudem.pdf
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d4609d984f7---dujusato.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cabfb960ba1---sesafof.pdf
    • https://btegypt.com/file/79357418055.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7ff549c92---xavisizulagorozurixa.pdf
    • https://vokalensemble-vocembalo.ch/userfiles/file/94038282034.pdf
    • https://textolinguisticsolutions.com/upload/editor/file/garaluwogusotozot.pdf
    • https://aucordechasse.fr/vosImages/41891129264.pdf
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/fb0def20f32df34e50dd87a57cd5ff5d/waviki.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=why+isn%27t+my+fedex+tracking+updating
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00012bb9.bin
00b67208d578f4df443701140d5e7ce3fefc8febcc8b211a83b0c62c84a2b2cc
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12BB9 18072 bytes
font_00_sfnt_off0000e755.bin
a5944e5bf07540c8cc819607fb0e28d88ea6728056fc337b1d342c6e46e80206
pdf-font-stream PDF embedded font (sfnt) at offset 0xE755 17000 bytes
font_01_sfnt_off000113a8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x113A8 16792 bytes
font_03_sfnt_off00014890.bin
6b9bd419e09d6ba987e18d9e0dde1e4aef70c41feb52d77bef313deb60ca61a9
pdf-font-stream PDF embedded font (sfnt) at offset 0x14890 11336 bytes