Malicious PDF — malware analysis report

Static analysis result for SHA-256 685fb4e1f4adbf4e…

MALICIOUS

PDF

93.3 KB Created: 2021-07-05 14:25:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2fafb4b2bde431c072875b6e6c0a1dc2 SHA-1: cded4e2c58fc77307616397c78273b41a84c9b6e SHA-256: 685fb4e1f4adbf4e9c04c4a17392d70a293e3fc8166435480b7a59a28a8a1b50
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to compromised WordPress sites, specifically within the 'super-forms' and 'formcraft' plugin upload directories. These links are structured as link farms, a common tactic for SEO manipulation or directing users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution via these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/95ins1i3qanael09f9skn3mok3/gudasibavaga.pdf
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/e5hgfk30gqiflp85iej2t1om92/77170234424.pdf
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/mga8hjfe7n6s7f6s9igjob5gbt/22867144058.pdf
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16094a1beaa12a---filonaleganewajipepunof.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071bfa4de2d9---tisufugebe.pdf
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/zezutedozefonosiwimod.pdf
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/cd39bfbb16c42edd1f520d0a8d57de58/rumajixabupixikezizexida.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d6df07b29---ruregemurajozemolofubi.pdf
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16074828e275e8---33119799208.pdf
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/k34ht3iql1mbiia7lcseg9por0/zizitira.pdf
    • https://alakharia.com/public_html/userfiles/file/19244771416.pdf
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/d2cd71a6a63bb9a54b85bffce5a9de99/633034621.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160851ec49df92---95909494743.pdf
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/890oleaaocnuaufn1hjo2o6iu0/80160161619.pdf
    • https://asthasupermarket.com/userfiles/file/18226100278.pdf
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/73bf741eed2dfce88b3011797bf4d759/vulivanifo.pdf
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c1121125f3e---71018553046.pdf
    • http://resortcrimea.com/ckfinder/userfiles/files/97027108854.pdf
    • http://modnyi-buket.ru/uploads/files/dowimajavukagedadipikobez.pdf
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/5djgj7jaubnp9t6s34js81erg3/sipekubufuxarixunudexa.pdf
    • https://heks-tech.com/app/webroot/userfiles/files/navomosabifefot.pdf
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/52rcqsj8fltifd0p8vud77omrl/32748007971.pdf
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/h3t9eh73aa3p77mkd9r1gnjeb5/sogozodukagerumezufofu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=can+activated+charcoal+heal+ulcers
    • http://medlab.webd.pl/upload/file/vuretevasaza.pdf
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3e7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E7 16792 bytes
font_01_sfnt_off00010bfe.bin
8fd0cd88875bab48a7e03358e476112ea47a8b85601238ba819807ea7a45cd4b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BFE 10664 bytes
font_02_sfnt_off0001246c.bin
f4878418f939ed410c29502950ea38cd9e78e5a1d30ae19a51638f0bcee7e9fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1246C 17252 bytes
font_03_sfnt_off000150ac.bin
c6549f22251a7c672008a5db7f07691c42d3183154b8b4cd03972a27c3442328		 pdf-font-stream PDF embedded font (sfnt) at offset 0x150AC 16060 bytes

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