Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce745bb45e561cbc…

MALICIOUS

PDF

105.0 KB Created: 2021-08-08 03:56:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0d2cfae4549248abfadac3cc762c2fea SHA-1: 0fd5cae84559777269deff3885828227a1b37979 SHA-256: ce745bb45e561cbc853efd5942c77231df0a43329becb9d86cbafdc6d4ea70e9
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to redirect users. The presence of these links and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate an attempt to lure victims to potentially malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d0340d9606---nukukukofafusirit.pdf In PDF document text
    • http://loscogliodifavignana.it/userfiles/files/80273438351.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd0d77570e---60791993094.pdfIn PDF document text
    • https://www.lightingsolutionsinc.net/wp-content/plugins/super-forms/uploads/php/files/258139410d79c011ebefc489f2fc0814/jufutarumozojosuketati.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/refin.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/69363193865.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a516f32ba69---74808545032.pdfIn PDF document text
    • http://fdscience.com/UPFILE/userfiles/files/20760711107.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/gs6ulqiv60vkqi2p725lk1aj7t/69919048280.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/fml43k93hak6ensu1k6psqah65/12156416747.pdfIn PDF document text
    • http://nhs71.com/clients/d/d9/d9c6bfbc4bbdd207836d30c01fe5869c/File/48048945604.pdfIn PDF document text
    • https://alves.bg/ckfinder/userfiles/files/naruxepifotobalikufow.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1610f1bdae3a6a---73512584559.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/44396445096.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b39de0a8e6b---45771324813.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/3ff708cd2e51e4835cf32948bea41d4e/bejurus.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7c8d09002---nuxaliv.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/qfdu7qvs2jpenp63a0hbdn34j7/fumokoramuwareva.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf6733f7b0---lavilobepuxiva.pdfIn PDF document text
    • http://spamsmsgiare.com/media/ftp/file/mojivitosejupobuwajuvun.pdfIn PDF document text
    • http://www.guus.edu.mn/ckfinder/userfiles/files/tidarutowiratevon.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160720a18b3803---98309833258.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160afc27e49b45---zigower.pdfIn PDF document text
    • http://royalgroup.at/tmp/16004401053.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/bd5597d4e7bb951875a314c5eb83e0f3/93890774999.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=alfabeto+hebraico+pdf+baixarPDF 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_off000130c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130C6 10668 bytes
SHA-256: 4fe895555275e2843556dda5609af88d4c7a8d101d91defeb82bbd02c61f783b
font_01_sfnt_off00014923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14923 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16135 21144 bytes
SHA-256: 33484850713ebfeaedba19380bc2edb63903afc19ddc2e004b0fa9f9b7b73cb9