Malicious PDF — malware analysis report

Static analysis result for SHA-256 88f2b914b1b28d54…

MALICIOUS

PDF

83.8 KB Created: 2021-08-23 13:08:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 060cfb5868b7513c333ddf102653f1be SHA-1: e0ccc4722721bb85b637184863d20a6cc6d62794 SHA-256: 88f2b914b1b28d54d2efe95ff314639f994094e9a23ba8d03d47cecf49c9bc43
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external sites, many of which appear to be compromised WordPress installations or disposable hosting, suggesting a link farm or phishing lure. The 'Fake CAPTCHA' heuristic indicates the document is designed to deceive the user into performing an action, likely to download a secondary payload or provide credentials. ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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://wastran.ru/uplcv?utm_term=list+of+diseases+and+their+treatment PDF link annotation
    • http://perfekt-dom.pl/designhome/admin/userfiles/file/gaxajifagulap.pdfIn PDF document text
    • http://struttur-arch.it/userfiles/files/84393852614.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/24e4e4babca1489131c67395ff94b4c6/pugaporasudodofewe.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/09goeid4mqrp6oijdcsnuerg14/kevodatitenomavoxifopi.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16070ffef2aa86---16526827523.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b21d2bc92c5---divujaredabitalizavu.pdfIn PDF document text
    • http://vytvarnyobchod.cz/UserFiles/File/61835780590.pdfIn PDF document text
    • http://michelschuurmans.nl/images/uploads/file/4907424969.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/jodojibodiluwagux.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609defad2c266---50614517086.pdfIn PDF document text
    • http://contactconfiance.com/files/files/7199672192.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/ff6bf0024bcc0edbfe223f545e24ee1e/xunatimowakuzamu.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/jewusaxolafamuze.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/45cf255f6142c1d074e948ff493de1bb/55364174019.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/67525342949.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609a8b458aa0a---punadeno.pdfIn PDF document text
    • http://zs-oilfieldequip.ru/d/files/nazizojiraf.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/93668155569.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/kuzokuzawo.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160728c82deff2---kapujofuj.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160810e771dfb0---nuvapupamuwidokawofeker.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/f7739d741ba7c7e9fb4a1d7535f4ea6c/47929279564.pdfIn PDF document text
    • https://sudhirsachdevaclasses.com/ci/userfiles/files/15500073138.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/99875505293.pdfIn PDF document text
    • http://orthopaede4you.de/userfiles/file/50709175514.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210504155821502.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160793ce99183b---bonuvemewod.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_off0000e19a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE19A 18292 bytes
SHA-256: 938330b8be116a73745e9c367b4caeebf155700abdfe045059c5a9401e15e7fe
font_01_sfnt_off00011180.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11180 10528 bytes
SHA-256: c288ed91347d39dd5cf6aeb24fe8ccda19767ac97dadce5299a884c3d2aff151
font_02_sfnt_off00012948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12948 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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