Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddfb4202e4a7c08d…

MALICIOUS

PDF

85.9 KB Created: 2021-07-07 00:18:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 09c6691fc32d524c4caf821184233bbb SHA-1: 2d9d2e81b51a83121e9832fd29a73fafddbd7645 SHA-256: ddfb4202e4a7c08dd6c13f23f0a6e4b55d23704d7f9a2e29139a8009893ef4c0
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, suggesting it's part of a phishing or redirection campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or exploit kits. The file's structure as a link farm on potentially compromised infrastructure is a common tactic for distributing malware or conducting phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609990d422c24---16987487369.pdf In PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/389be9dafde94bcf0648a46362fee073/rusifufilubenugokubave.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e505d5339---nudafut.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/32lbf7tn6o93mja3i352rjt9d0/mezufaduvaxabaj.pdfIn PDF document text
    • http://ballmillfactory.com/d/files/23513794761.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/889c276ae50f8d63dbfcdbbd6d3817df/58843967778.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608897345f4cb---94448789491.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acc33bcac7e---tufadofib.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/salop.pdfIn PDF document text
    • http://autowassenindex.nl/images/uploads/piborenadapaxojejepanul.pdfIn PDF document text
    • http://conganbacgiang.vn/app/webroot/uploads/files/40729117142.pdfIn PDF document text
    • http://ubest.ru/images/file/21569551387.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/32048124628.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084ffe8e0d32---gegenivukabifatatulaverog.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609c6c45acb13---92305067682.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c048347713a---22055419807.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/8e6cf4f9bf0f89d44a6cb6ae7c4585b3/54673003313.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a533112f7ad---dodoterovuko.pdfIn PDF document text
    • https://kildevangen.dk/files/wovuleradalad.pdfIn PDF document text
    • http://starsunited.at/upload/files/80889948963.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles//file/20288197562.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/0b5ce7d1a45d9420e8fd72fd7088ae7c/67070515121.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16077e1d40a2b3---kunobaxiwobufabopom.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f65340f0a---fowajunemawebapi.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f527066d8---kitakuludavijelor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=cut+a+chunk+out+of+my+fingerPDF link annotation
    • 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_off0000ec7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001048f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1048F 17048 bytes
SHA-256: 615ad9dd9c38a3f3851431887644546b01976d1ca0d11e67316bda5e87c5fef8
font_02_sfnt_off00013126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13126 10908 bytes
SHA-256: c2e9f3a23f93a42708072581e71fbd5bd9a5779547ed820ecbfbe2c437bc4f0b

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