Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd14ea2dfc61bc46…

MALICIOUS

PDF

84.6 KB Created: 2021-07-05 12:43:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: adb3fb0c93570452abc5e39743fec47a SHA-1: b265bfff4a1072bfb8089f01a2e710def72d4d62 SHA-256: cd14ea2dfc61bc46e1c8669133632b9fc4cfd252b2fb38fd35812141ff49b0e6
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous external URLs, many hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The file's structure and URL patterns suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://conexusinternational.com/ckfinder/userfiles/file/zeximumid.pdf
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/ef004691d1177d219a1b646c089616bf/52710212591.pdf
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/8495b82f94075c9c53c14ee1747cc69d/37535056279.pdf
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/m2gbp2p2qpt3gpnmeehi32t9o1/bexes.pdf
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/74a2f0d9e71efa5c70e2cce88f32bcac/zilitad.pdf
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/hcjdnf2r5h2pksat7n0qb1ghpu/23690663493.pdf
    • http://resetimpianti.it/reset/public/file/dosugorodofigagezemi.pdf
    • https://orldoc.ch/wp-content/plugins/super-forms/uploads/php/files/q4o6sbt5hv1699ohfel291q355/gibarupapa.pdf
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/higmthlo1merseisggunl2bgls/lupewegegifeke.pdf
    • http://driver-jazda.pl/upload/file/60931820359.pdf
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160764430076da---burumapapekusuribudodel.pdf
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/qlr55otu9qif9r110vr4pimohr/wozibelabexi.pdf
    • https://kovtec.pl/eurostyl/photos/file/19447187077.pdf
    • http://anthonyvienna.com/sites/default/files/file/luneberojep.pdf
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/bf454aee03c7b21261cacf603d5d2413/97657898178.pdf
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/c8l6flg1pr3v3kvq990lpo95n2/50182079833.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/iu6k2vtccjoemhfi112qs1bf7o/19798193313.pdf
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087f63c181ee---tobovitosedevarolo.pdf
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160927a510234c---88677002110.pdf
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/56m9k07utvc0paskhe9g1m7nk1/dodurivogawivowux.pdf
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/4d44fff257d7ff1fe334ec57734d3cd1/39627253473.pdf
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/53sd8tg3rlirdk51bie509c9is/kolugiru.pdf
    • https://lesfeesdelhetre.fr/upload/files/42980528367.pdf
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607022005daa4---68078005360.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=baked+apple+oatmeal+cups
    • 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_off0000e7ed.bin
5555a596db9b2bde4ee3a4fde69934d49726108880a16d7c865140f6394b30d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7ED 10624 bytes
font_01_sfnt_off00010055.bin
59b6f93e060b4e7ef61d1753496ab761c6f20a5ac59a73f0449214c86a90b321		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10055 17128 bytes
font_02_sfnt_off00012d0c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D0C 16792 bytes

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