Malicious PDF — malware analysis report

Static analysis result for SHA-256 8505cab448bb9a39…

MALICIOUS

PDF

163.8 KB Created: 2021-06-28 22:00:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: adc73709d36b742c60296f30179adee5 SHA-1: 852025a3868d7c91bb5d71b561dcb34d3fe3b1d5 SHA-256: 8505cab448bb9a3911f350f9d7af2d0550c2adc69c1a88dec7365642e7e3b2ef
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that function as a link farm, directing users to external sites. Several of these URLs point to compromised WordPress installations, suggesting a potential phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9741

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://infrive.ru/uplcv?utm_term=wd+tv+player+manual PDF link annotation
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/f9f7add309dcc7bd669bb7c1f68f44c5/28475373546.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073cf84eff3e---64557455856.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a15385689e4---mujinisetemoxirapevu.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/d8f415ada02370174d0d5bb173e0ad07/84464866206.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/83196266398.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e31a57d5c---93226977042.pdfIn PDF document text
    • http://enerjipiyasalarizirvesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca83562b25---jegafubenuxenufow.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/vununoberi.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/naar98bi8pme2bl5nchq8nla0f/46928643495.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/ol4lfc1ei3dogkp4qhkn05jha3/23526254241.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/f2115719fa0aa50683d26a1a675f0b79/33239038014.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160905c69d44ba---49654190846.pdfIn PDF document text
    • http://garderoba.sk/images/_file/68079785711.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160cfcd2aca4b6---tibewixuvunatikeraj.pdfIn PDF document text
    • http://blueyee.com/upload/file/111201518382.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/72a002b10e6a21f699e97ed510709b53/revepa.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a44e8d6da13---54783883753.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/906aa71d8f4da3579b46d79c9064774a/46854072038.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/608909c69df29384330306bf5e4d13d9/gudetuxusajibipo.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/vigaku.pdfIn PDF document text
    • http://lyshiying.com/d/files/13763465093.pdfIn PDF document text
    • http://danburyhighclassof1961.com/clients/b/b4/b42d7d7907ff1a67dd6fd366dd3c6775/File/jobilijafepoduredoso.pdfIn PDF document text
    • http://www.darvidproperty.com/news/file/13226365695.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/63401762836.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/7q4rm019qsavln8mv6dfooo851/gobirarax.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16088d3a8eb080---92933323876.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00021460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21460 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00022c72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22C72 23896 bytes
SHA-256: 2bd46adb5a738d57a7a481b2132496391c0c512822144271db9700486d953993
font_02_sfnt_off00026899.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26899 10444 bytes
SHA-256: 0f9fd40da2e798afc345c79b8e689cd974d8e73e3d646bc3c25725505616d125