Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dabb5983bd13fd7…

MALICIOUS

PDF

96.9 KB Created: 2021-07-14 00:12:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3f50eba16c1625c59ca602c3515d5302 SHA-1: 55c9a18cf8ad4a00883f53b25152cadbe060071a SHA-256: 7dabb5983bd13fd79458384f72fd049a8fc288d58c4bcfa370cc8e7514b0f70f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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 http://studiospazioambiente.it/userfiles/files/wamopesazalawol.pdf
    • http://yuanjen.com/ckfinder/userfiles/files/79634299202.pdf
    • http://fpsh1980.com/clients/7/7d/7de5299bd6bdc19cdd6b275c058e9c4a/File/vivifaribanonuxegomarosif.pdf
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/82rcfuthhuu938m4b7otlkcl1l/95470265235.pdf
    • http://doktor-okonski.pl/uploadimg/file/wubesipugunewud.pdf
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e41783d84---36914209918.pdf
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16094130918dcc---62967454995.pdf
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/4n97ku30ob290dudp7ung526h6/29610207134.pdf
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/fc45c8046f32acebb758690c495f21d9/zubinebupu.pdf
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d68525d322---93259742890.pdf
    • http://gdbchurch.com/clients/43262/File/gefeboxopobojorolaze.pdf
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/d1sja9n7s55rjhsdj0jr77oaiu/mubijofubonivimaluj.pdf
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070261b9a5ea---24308698128.pdf
    • http://sl-light.ru/design/img/upload/file/dawaradaxasifuwowuzasepo.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/a8def01059d0cf69afe2341a45ba1bb5/tolaxosoniwoxu.pdf
    • https://pui-vital.ro/msg_media/file/97069601593.pdf
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160773dc47b9c1---12459464798.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160793ed197a86---49787826049.pdf
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/fc5c08d964a52b7050cea28b3b0921fb/pudetanamitulusumu.pdf
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/sofugonexetipe.pdf
    • https://presstone.hu/userfiles/file/72708695676.pdf
    • http://irinaburmistrova.ru/files/vumalewuberu.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a08a08d8b5c---29685340929.pdf
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160882a1ab2776---mozixiz.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=sql+over+partition+by+order+by
    • 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_off000117d0.bin
43560caa6ffdbf0c7b1400d0af881ee2adf960a5a1b2384688c179e7f8b37512		 pdf-font-stream PDF embedded font (sfnt) at offset 0x117D0 18008 bytes
font_01_sfnt_off000146c8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x146C8 16792 bytes
font_02_sfnt_off00015edf.bin
a97f9fafaf5e6d89ead1774e8f5ec868eea406129895649dfec8120835459161		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15EDF 10756 bytes

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