Malicious PDF — malware analysis report

Static analysis result for SHA-256 537e51966be77f8a…

MALICIOUS

PDF

103.7 KB Created: 2021-06-30 21:02:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0ff3415b19025d30bb8b9ae5c885847e SHA-1: bd23e0ed35081746c641a4b723a0d50af0fde37d SHA-256: 537e51966be77f8ae0549e5f791f46f1148cebbaedb3167ca5dfb345a23a3afc
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure as a link farm suggests an attempt to obscure the ultimate destination and evade initial detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083de56d96a5---97433740441.pdf
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/bah1oqu4i7e51c1ol0pb31veu4/suxakugowugiseva.pdf
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/c825404d038cbfd5b31915062d40c9d7/xopakesegodafe.pdf
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/0211fff6f1afc4864f95f988c734049c/fotojegusitoniluretisa.pdf
    • http://anhuicrew.com/upload_fck/file/2021-5-1/20210501150920212908.pdf
    • https://xo-sound.ru/userfiles/file/16418065444.pdf
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160bf8902645d0---rixuxubupujiwalu.pdf
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/oq41bfrcquuhh7o7kuerpg3qdh/22834915479.pdf
    • https://sp-pir.ru/wp-content/plugins/super-forms/uploads/php/files/92985814a8e3bb414d98691d50bb0954/58815203219.pdf
    • http://holidayinntorino.com/userfiles/files/tibowonakab.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160b56dddd47af---91582610293.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e80e89b38---1656501379.pdf
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/98ie89nsn2dcnbi6jtqiblcnd3/geged.pdf
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075038213b1e---22920480407.pdf
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/1590ce73bc9a2f4eb820b9d139218ea1/falegoroxa.pdf
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c9828e78832---rujulutagaxifupinike.pdf
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/p3qaqq44uenh7f3qmr4qd9o7a7/52729901269.pdf
    • http://nextgt.eu/uploads/file/kirirotupojigujubu.pdf
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/9nl9e91is653pprt2u85if22o1/7195399322.pdf
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d7e57d825aa---juvewevoso.pdf
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/20903479015.pdf
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098c97d65fa9---mawenezebog.pdf
    • https://www.alapan.org/fckimages/file/94231550563.pdf
    • http://umrllc.com/userfiles/files/69560165113.pdf
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160813daa87918---miroginurefakipamix.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=what+is+the+future+of+robotics
    • 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_off000134f0.bin
ddce09c457e7c46007227bf5882cf158aabad11c10854a8b06ade6385c92e98e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x134F0 17512 bytes
font_01_sfnt_off0001626c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1626C 16792 bytes
font_02_sfnt_off00017a83.bin
45167155c1897b54f981177af5394266dfa864c87d589acbc140c46500171cba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17A83 10516 bytes

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