Malicious PDF — malware analysis report

Static analysis result for SHA-256 b05b86aa9972fbcd…

MALICIOUS

PDF

83.7 KB Created: 2021-07-25 10:04:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 330148c038ef8479add64e31449b0cd2 SHA-1: a594bbaf5482f28d8cadba9879f73652ece655d5 SHA-256: b05b86aa9972fbcdde1a6f1536d7e1b3c2180ef23d9913ef7c365e90cde53132
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external resources, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent. The file's structure suggests it's designed to act as a link farm, potentially for SEO manipulation or to distribute further malicious content, rather than containing a direct exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/cd3f23c866f1f1774204a110dcd82410/zesoxipixibovumaxitixeb.pdf
    • http://bluekeydigital.com/images/pic/file/velalusejuluda.pdf
    • http://bartuceviri.com/userfiles/file/pagatewavezokoxakemixobo.pdf
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/45312f5a3ea631f84a72fde5e5be8a8c/daritubawofexafe.pdf
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/mfm01n07t884kj3nff5hhq24k4/24139854594.pdf
    • https://sinhadventure.com/uploads/file/69380829677.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c953ff7cd80---fazewunaju.pdf
    • http://guoyangmoju.com/userfiles/files/82351394872.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a353a7be1cc---52010113091.pdf
    • http://wypelnienia.kratex.pl/wp-content/plugins/super-forms/uploads/php/files/1bfbec6ca97041fb1e65946ee050417b/zinorefekerumirim.pdf
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4cb462e1d0---kolepiwebunofujaloforo.pdf
    • http://dolinakrzeptowa.pl/public/upload/ckfinder//userfiles/files/xawodefojusetiwovozag.pdf
    • http://kap-group.com/ckfinder/userfiles/files/mofidabomuta.pdf
    • http://extracam.es/app/webroot/arxius/file/suxuzafanipube.pdf
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160efee6a3f37d---82809570466.pdf
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adf1b1a94dc---33176054369.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071cf1916d1b---83461916088.pdf
    • https://trimix.bg/UserFiles/File/mizokoxetajejinadetosej.pdf
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/079ac2141aeea4e85efe7757fd63e1e6/31663964643.pdf
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/3d1698b7d70244c25835e38a9992a2aa/46366019615.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f67cb5e443---47917415605.pdf
    • http://surtek.biz/image/files/20150204_223233.pdf
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9f5b57b3ec---77673584882.pdf
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/155b588428c09ffd4780528a71f8af81/xinudimenupofaxekadu.pdf
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/1a130f40b81b4fcd9b92d4e4a39574c3/kanodugejodininep.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+replace+weber+genesis+grill+burner+tubes
    • 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_off0000e351.bin
ac3a55db172a4d65d5e161f2727a90ed881a1c1befb255f2fd86d0ee220e8e52		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE351 17136 bytes
font_01_sfnt_off00010eec.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10EEC 16792 bytes
font_02_sfnt_off00012703.bin
dcfb21b43208504997c0aca858a1cbf57441e934db6eba4a33ce007dea4d7577		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12703 10868 bytes

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