Malicious PDF — malware analysis report

Static analysis result for SHA-256 a233157f47f3a001…

MALICIOUS

PDF

111.9 KB Created: 2021-09-01 13:50:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d8abc652cb8a115bf208b2b30aa84d75 SHA-1: 74272ab4d1b4a55fd175e6ebc50dcec89f070ae9 SHA-256: a233157f47f3a001cc32a047bc4ed1e9aa122710f176bdcc381ea18431b248bc
154 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan and ML classifiers, indicating malicious intent. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7670

Heuristics 5

  • 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
  • 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://ketchas.ru/uplcv?utm_term=educational+system+in+nigeria+problems+and+prospects+pdf PDF link annotation
    • http://piscesappliances.com/userfiles/file/repizedi.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/6f42f6c5a7713451a04a80aae029dae9/7871583355.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ee7bd55f1fa---5925956928.pdfIn PDF document text
    • http://caythuocdangian.net/images/files/1759557929.pdfIn PDF document text
    • http://sbriz.ru/userfiles/file/95687241515.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4cd2cd06c4---80259602540.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071d870ba5f0---wirupifof.pdfIn PDF document text
    • https://elesud.it/img_pagine/file/60472348699.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/627f29e94126766b85c82dd4e44a9152/xuwudevobiwegorex.pdfIn PDF document text
    • http://rezidencianestor.sk/app/webroot/files/ckeditor/files/42945163889.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/c29b3f1f14faf4a37ade24f8fb93da72/31800951662.pdfIn PDF document text
    • http://aven.su/userfiles/file/sinokewejozofimezazipoj.pdfIn PDF document text
    • https://sharadsangam.org/UserFilesTwo/file/95009182264.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/s2fbk28s8moqur2s2urbceilee/43398736482.pdfIn PDF document text
    • http://nineslash.com/user_file/file/49847064961.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bad3f448609---jerarosawotapox.pdfIn PDF document text
    • http://xn--80aafbjcazdrhzgiddbbcsg4l.xn--p1ai/pict/file/musepaziririg.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a40c7b95a19---61533518878.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bf588b3076f---xosoxiso.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/33522207990.pdfIn PDF document text
    • http://studiodabo.eu/userfiles/files/xeradajinazid.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161136958182f5---babebowekojarijuzukaro.pdfIn PDF document text
    • http://seattleteriyaki3.com/uploads/files/18408370418.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/78767131890.pdfIn PDF document text
    • https://ichapps.peaceofworld.com/ichapps/ckeditor-ckfinder-integration/uploads/files/73145013081.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18416 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1