Malicious PDF — malware analysis report

Static analysis result for SHA-256 862632a20f88943d…

MALICIOUS

PDF

69.5 KB Created: 2021-09-12 02:13:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 12734528f2d359e357bbaa2d8860eee4 SHA-1: 15324146e813db0ba0effe39b7bf58f414ddbaf3 SHA-256: 862632a20f88943df093aadd50d565713e8e9e845cba35d2b7ffaedd58eb1b2f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9130

Heuristics 5

  • 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
  • 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://irlanc.ru/uplcv?utm_term=os+maps+for+android+phones PDF link annotation
    • http://dzstock.com/Upfiles/file/93849203614.pdfIn PDF document text
    • http://shahgrp.com/uploads/pumumavobiwubevipusasufo.pdfIn PDF document text
    • https://bhsbeacon.com/FCKeditor/file/66398818983.pdfIn PDF document text
    • https://bocion.com/ckfinder/userfiles/files/26718813765.pdfIn PDF document text
    • https://www.zolmedis.lt/ckfinder/userfiles/files/lekudanepivobifap.pdfIn PDF document text
    • http://media-production.net/admin/ckfinder/userfiles/files/sabofevakimapuda.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/862bf2c0e14dcd0c4904a29c3ef03640/83518902898.pdfIn PDF document text
    • https://www.hippocratio.gr/ckfinder/userfiles/files/wiguto.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/e2b9ab48660b82ef0ddde376161f400a/93908090497.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/jepidapodanirijivom.pdfIn PDF document text
    • https://hexema.com/FCKeditor/file/gasitotopawubafuvapon.pdfIn PDF document text
    • https://pasarangroup2.com/contents/files/xitexumevowugolemugawuf.pdfIn PDF document text
    • https://hankilfood.com/upfile/files/35112207773.pdfIn PDF document text
    • http://studiolorenzoni.eu/userfiles/files/fapufejajuj.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/16134ca700650d---25525223116.pdfIn PDF document text
    • http://lorichphoto.com/pictures/file/11214467298.pdfIn PDF document text
    • https://neurondevelopment.org/userfiles/file/36422164747.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/sakamekonefe.pdfIn PDF document text
    • http://ourgans.org/userfiles/files/lefibakabosikunagog.pdfIn PDF document text
    • http://pmke.cz/pictures/files/ziwibujowakokuwaduv.pdfIn PDF document text
    • https://migger.dk/userimages/file/vujonevepulet.pdfIn PDF document text
    • http://qdsenfeng.com/data/files/nusebobalimujosagekuwadi.pdfIn PDF document text
    • http://marleenjansen.nl/images/uploadfiles/teginolatumuladuvipigazux.pdfIn PDF document text
    • http://otworz-biuro-podrozy.pl/userfiles/file/vubatuzabodatemuzizunu.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB8A 18240 bytes
SHA-256: 7234e17596ab5a4d745740ec94491bcf8a9c8522707e4150d0f60b7a30d30a83

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