Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b3945ad0c86ba57…

MALICIOUS

PDF

77.7 KB Created: 2021-08-04 04:28:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 33d8b15d4f87afcc49cfb6a67fd68b95 SHA-1: 93cec191a3663ed8e59a424bc57cf9ee43e6df96 SHA-256: 4b3945ad0c86ba57acb08c24766becf285d1cab7a8621b5c2b27c53e9884dbe9
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs hosted on compromised CMS uploads and disposable domains, designed to redirect users to potentially malicious content. The presence of multiple compromised upload links and disposable hosting indicates a deliberate effort to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://iziusb.com/userfiles//file/85458288951.pdf In PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/d38994cae488a528239de08cc11191c0/suves.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/60281987901.pdfIn PDF document text
    • http://www.ktgroup.co.uk/ckfinder/userfiles/files/digonobijukezeparox.pdfIn PDF document text
    • https://www.syah.org/wp-content/plugins/super-forms/uploads/php/files/e5c7c44e5d9e92bdc84a26e2e99027ba/12856189078.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d3ff4c417---dajisogolex.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/35755510426.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160bc1ba1a64a8---24387830375.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/oso904rnnit3tnraqa9t32t1m0/55105832866.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/51909069098.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/662afd5231bdfaf4ebab537d194b840d/mirekejizegedowof.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/c75f51a8b89b9a94af49f93c232431b7/xisopitugup.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/diwulezemis.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/906141e00b5e74e518b7fbc9ad217115/64415422997.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608323d04ec81---70291026372.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/ga821mcd0sihgqq47aa02ibn67/jegowosajumiv.pdfIn PDF document text
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/41ofibt6t5cioc7e02eulpbhsg/golefe.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608552f57a430---55142653314.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adad2635ace---lewukuretenuw.pdfIn PDF document text
    • http://pinturasoltra.com/images/slider/files/51424293469.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/561975d8f69abe3d8105edc82d42fd9a/97246466173.pdfIn PDF document text
    • http://dryoucosmeceutical.com/userfiles/files/bamidekepafar.pdfIn PDF document text
    • https://panama4d.com/contents//files/teworonefowiponavosibip.pdfIn PDF document text
    • http://www.linkbucks.com/pORbIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=descargar+pokemon+negro+2+para+drastic+megaPDF 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_off0000c889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC889 11024 bytes
SHA-256: ff52199b5e1560ae48dd43f0f7fa5827cdd3753b24d3156a2809c8cc7690ea2f
font_01_sfnt_off0000e212.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE212 17836 bytes
SHA-256: e04f39e6ce8570ae46058d17eaaad089946526e242834eb8bf66739b229d68f1
font_02_sfnt_off00010f9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1