Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf6c3100eacfff38…

MALICIOUS

PDF

78.5 KB Created: 2021-09-03 00:30:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: eb5f033ffc7714b0f2578070e4b280e4 SHA-1: c0b93e31ad3005550394ed77c070872ee7e4f979 SHA-256: cf6c3100eacfff380edd0fa25628326ca2c4755e97a640fc489dd0cbb191812d
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to websites hosted on compromised CMS platforms or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://deauville.ru/files/file/3533005198.pdf In PDF document text
    • http://assushop.com/userfiles/assushop.com/file/63339688530.pdfIn PDF document text
    • https://peintures-descours.fr/fichier/files/zosovojugigodilo.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160871fda1a097---bipenumibaziloretave.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/cqdj8j6cvho0iu9jpsltq5khht/lezodesalolu.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/6ae9nqcvgv57i12uq8c43o4s17/kipuduxijasutep.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/3e78c5866027960464ac85e6ccde2c66.pdfIn PDF document text
    • https://thegioidongphuc.net/ckfinder/userfiles/files/14443898775.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd9b90b1b3---bizivirofavawe.pdfIn PDF document text
    • http://ehs1958.org/clients/73155/File/94954308213.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/q3cc055lgj1agl5cbof00tp3t8/mifunadafanetasigo.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/vazosimejaxitolabizoz.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/66eee5ee7df5453e1add871563cdab0f/51155879726.pdfIn PDF document text
    • http://dfwarbitrator.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/51138665337.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/qitfph8uh8unrgemskbg049ee3/10234054329.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/a9dfeb5343d993cbb23f18ff9d0e8462/pawitagi.pdfIn PDF document text
    • https://rlmahtani.com/userfiles/files/40227515267.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/v5j9he5jg0h5519ptsslk30gg0/56829485105.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e12638e20f5---tiruwarilufi.pdfIn PDF document text
    • http://airmon.hu/images/files/gidasad.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a213de1b42c---saxedenanitixadaritedami.pdfIn PDF document text
    • https://prcomponents.com/ckfinder/userfiles/files/zubizekumomorarorilus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=history+taking+in+clinical+medicine+pdfPDF 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_off0000cac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAC6 11160 bytes
SHA-256: 4a3863106442409ffba5f3351da21cc84212e08112d186267914ddd4572300f1
font_01_sfnt_off0000e4ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4AC 18220 bytes
SHA-256: c1aa86769aab2f941a766255a8f881fa1b3e6637b9b515ba9e4993d2f0ea2a1c
font_02_sfnt_off00011422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11422 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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