Malicious PDF — malware analysis report

Static analysis result for SHA-256 12878ab98a70c19c…

MALICIOUS

PDF

89.0 KB Created: 2021-07-18 18:21:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f64ac9395e0033ba6d9ab821ea8da6e0 SHA-1: 19fd19207bcfac8a24cd52cbebf523ae13b94a94 SHA-256: 12878ab98a70c19cf8adf7880b0a769df1f77fba3d698e1f3760d104ee367e35
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, specifically targeting the 'formcraft' and 'super-forms' plugins for file uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic findings clearly show a link farm designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608405ebdf74b---fegerog.pdf
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a292b39c9cf---53837459752.pdf
    • http://wojno-stal.pl/pliki/file/70964437603.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160f10cc3e6a94---57534449460.pdf
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ba24ef5e7---61660424878.pdf
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/74b970d1362d98f6e1ab6aa7aa06d088/76069377809.pdf
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/d0c9dec0d8ad7b063519c967dbb9de10/57309140859.pdf
    • http://mini-garden.ru/userfiles/file/80936986422.pdf
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b616a59737---67793362045.pdf
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4ecce8be2---ludajeka.pdf
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/p8sthpevn38rhd902662iusc61/jiwepogumemakilomik.pdf
    • http://mawaevents.com/uploads/file/77456986120.pdf
    • https://gujaratisamajparis.org/upload/files/77403194899.pdf
    • https://soudurelausiere.ca/upload/editor/file/29107044325.pdf
    • http://brandnewgoods.net/userfiles/file/22287313402.pdf
    • http://legalinet.eu/userfiles/files/62955079602.pdf
    • http://ciskmv.com/css/file/dijitukanixi.pdf
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4de319864---66358540838.pdf
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/6341d161b1338192994c0310a0cff6fa/figedozidoveguwebala.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609967f82099f---mabaridobabiko.pdf
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/7c17bfb0a6dca6aa08867089bd595e9b/xepekubisigiw.pdf
    • http://pijntherapie.be/uploads/files/xojonuweki.pdf
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9900bc5a3---63941769695.pdf
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d617d27059---87359192533.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=put+your+foot+down
    • 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_off0000fccd.bin
41b0902d2a2e2e5a1f4e5ffe9937d73efb4c81eaa25c12b6d28186ed8db15521
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCD 16676 bytes
font_01_sfnt_off00012840.bin
ff3a38e012d3234d84028e80989ca2c8b44b4b3b1940c09345481bc8cf54d7df
pdf-font-stream PDF embedded font (sfnt) at offset 0x12840 10048 bytes
font_02_sfnt_off00013ecb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13ECB 16792 bytes