Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b2c0a6c79055ec8…

MALICIOUS

PDF

98.3 KB Created: 2021-07-19 17:43:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1c1831bb960ea9b309c4a295ea16139a SHA-1: cadc143138493bc87ed8c9a0555246cf69fcc57b SHA-256: 6b2c0a6c79055ec8842f0a67447a6250aeb7a5688517126edf88cdeea78118e8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics as containing a link farm hosted on compromised CMS uploads, specifically WordPress sites. The ML classifier and ClamAV also identified it as malicious. While no scripts were explicitly extracted, the structure suggests it's designed to lead users to potentially malicious external resources, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9800

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 https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160743e45f2749---malomu.pdf In PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8f1be6005---80957341018.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b77858812---pizozemomurejuganijifanug.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/bawutafogumarasexuzewusa.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080446be7194---36367135483.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/23ec0e670d2316ecfb424523b8ec177e/vuganeviwofelix.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608778556af0f---99458231205.pdfIn PDF document text
    • https://toyotaautobody.com/ckfinder/userfiles/files/rasabarogizuxib.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/roliz.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160cdbf276c623---malivawizumukefuwewow.pdfIn PDF document text
    • http://nesemlak.com/test/images/uploads/files/54075536505.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/888b2dd78c1c077ab592be487da4e467/sufovixamazopirofisurowo.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/7c3ecb91bbf6761ba9b57b071c4b2629/79651546333.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/4942105395.pdfIn PDF document text
    • http://studioassociatoemc.com/userfiles/files/woberusijojo.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076ec62ca7b8---xufasor.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f0e445245---53905512.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/bfc58fa45c375c6da668e5ae07502841/ruvalovorel.pdfIn PDF document text
    • http://ettermanenterprises.com/ckfinder/userfiles/files/97668641014.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/7283ov7evnlk1do0pobs0fjbo7/topusepipowidutipejamu.pdfIn PDF document text
    • http://sam-global.info/files/file/94408534390.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/97958183878.pdfIn PDF document text
    • https://ancoraeducacion.com/images/85354457843.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fdbd5a1212---guvopekinamelaba.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/18923966792.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=new+codex+for+9th+editionPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073166121629---347916029.pdfIn PDF document text
    • 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_off00011de6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE6 10532 bytes
SHA-256: ccde13028a1c08ffcf6a8385c325919985d63ad7e72c3a869230343d6ca895f6
font_01_sfnt_off000135eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014dfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DFD 17012 bytes
SHA-256: c48eb18694e931e024873ba905dc44ac44e5a3da0c2596376899c895ccb2cbca