Malicious PDF — malware analysis report

Static analysis result for SHA-256 c341d6f102b80ed8…

MALICIOUS

PDF

84.6 KB Created: 2021-07-03 08:16:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c4a134f5e93d98f1dfdc3533744b70c3 SHA-1: 56e5344f09707b0c01ed7f7dd578df0a41a91cc2 SHA-256: c341d6f102b80ed81b0a8c673366dcd5ddb107048e8ac67c690655ceab12684f
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing pages or download further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF designed for distribution.

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://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/b733a91eee751cc35c2786b274daf9c9/86437620337.pdf
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/d4da0d62649abd4b237261cb7561ee66/fikajokisewez.pdf
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/161157c4017b387bed3b8aed4a7f2675/vunegezozibegeku.pdf
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/4e3240ea27747b14837b4b449e4f03f2/loruxefakas.pdf
    • https://studio-september.com/wp-content/plugins/super-forms/uploads/php/files/9276b7c8d742177bab25be1e2796420c/78219316911.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160909a14e91f6---zobanimikuto.pdf
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/633a9e345f9f85468a89d9ae8c1e7399/luxefosizolinin.pdf
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757b55a0a6c---10123540792.pdf
    • http://sotel-perm.ru/site/file/jezisamademorewidisitize.pdf
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/1763a699581c18ee430d5405a1fa30cd/vevovegajujif.pdf
    • https://magiccat.pro/ckfinder/userfiles/files/27974361555.pdf
    • https://poolpoint.be/uploads/file/91887794785.pdf
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/2lrre5c46262p94nhhnnoemj97/xovizokalorifaxaxojow.pdf
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608309fcda3da---26518924665.pdf
    • http://amdind.com/userfiles/file/68433313651.pdf
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/uc16gf21qt9jmec4f8f56bko9t/2054546706.pdf
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/d7deca1443ecfaac0a1e2602b8278c19/40889415062.pdf
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16075296d8c08d---5726216887.pdf
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160976bd66d827---41263318118.pdf
    • http://scuderieverdina.it/scuderia/userfiles/file/51423320383.pdf
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210620_3A8E27BE9E0624E6.pdf
    • http://havefuntogether.com/image/upload/File/sizipezeboxawirijixatofa.pdf
    • https://lastcallslc.com/wp-content/plugins/super-forms/uploads/php/files/0ea43eba27a409c23fc8b5b77e4a2c09/35344444007.pdf
    • https://abofahed.com/userfiles/file/79110915347.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+do+rational+root+theorem
    • 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_off0000e540.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE540 16792 bytes
font_01_sfnt_off0000fd57.bin
aa77d08b5bd13905f00a609d0e57e48a89d81c5b6c452d47900c9cc644bdd915		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD57 10420 bytes
font_02_sfnt_off000114a8.bin
f2da584349b9ac4c845550dcce66bc526fc43e2f01caa953c81f979336b9d50d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x114A8 17804 bytes

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