Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb91bf4df06f6641…

MALICIOUS

PDF

91.8 KB Created: 2021-06-29 08:47:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e45e2a19fe63bbefad49de64c85b2042 SHA-1: 188b3d3c35764a79b9fcac35927e399607efe1b6 SHA-256: bb91bf4df06f6641a555bf4eb1e559dcbf3c7c2d41410bcce095d9f4e85d91ad
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV. It contains a link farm pointing to numerous compromised WordPress upload directories and other disposable hosting sites, suggesting an attempt to distribute malicious content or conduct phishing. The presence of embedded URLs and the nature of the link farm indicate a likely intent to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://classicalgardenfountains.com/uplds/file/moxofowenugojimavapak.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16071a5906cd9a---32525687442.pdf
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4fc125be16---majaj.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/9cbb95080ff7850b28654e777157ad8a/16005904495.pdf
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/3427edabc4581d630ae3b390ed2bbf4e/kemipudodi.pdf
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/kifevil.pdf
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/3108721e3f34577b25667ce734c36a76/rogupikosubewoxene.pdf
    • http://caratow.eu/userfiles/file/nimaxolilidebalebufoxa.pdf
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160792a3b2ef28---68163434826.pdf
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d6b122eab---noroxizikug.pdf
    • http://myucmas.com/userfiles/file/96694846773.pdf
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/85726243348.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aea894340e4---10420484297.pdf
    • http://alliance-ltd.com/userfiles/17742093537.pdf
    • https://balaji-technology.com/userfiles/file/80424426914.pdf
    • http://tamlaproject.com/userData/board/file/71431042101.pdf
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160779fbdb281a---dewolajopomabomenit.pdf
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b148f4266df---fukenulonegetalo.pdf
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16085846debd46---jotasomifuxasovisutifu.pdf
    • https://sonarmusic.hu/up_image/file/kokejuvoj.pdf
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/oit57itvfeqkf5sgrol7tfl65tag0sr9/pobazopujagip.pdf
    • http://brmhn.com/userfiles/file/20210615232220_kex5ig.pdf
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cebca65bfa---gesagekolajujelug.pdf
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/db257c2c8300a6fda355f8b927b5c240/xavoniziralarobu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=stewart+calculus+metric+version+8th+edition+solutions
    • 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_off0000ffca.bin
d55c163fa2eb1a349b5ead34d28aa8bb4dbe86e33b60126ac0e1be6ed26c8d65
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCA 11172 bytes
font_01_sfnt_off000119c1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x119C1 16792 bytes
font_02_sfnt_off000131d3.bin
1964667a532bc6ba2f39003eb0f04d57c0210db3708e332d15c0258e640f5fb0
pdf-font-stream PDF embedded font (sfnt) at offset 0x131D3 17880 bytes