Malicious PDF — malware analysis report

Static analysis result for SHA-256 172163315cb36a96…

MALICIOUS

PDF

81.8 KB Created: 2021-09-12 00:02:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d3c5f58d388ba391acf64b323f513330 SHA-1: 41f238ba7b0587b33acd2ad559d944490b2bf14c SHA-256: 172163315cb36a96bb52ba5d87224acaaf02525032dd10e8ad193522ef2829cb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript and a significant number of external URIs. Several heuristics indicate that these URIs form a link farm hosted on compromised WordPress sites and disposable domains, suggesting a phishing or redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://playitdirect.ca/ckfinder/uploadfiles/files/galajatuvomefizixeja.pdf In PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/49535511067.pdfIn PDF document text
    • http://zeroseistudio.eu/userfiles/files/42179331299.pdfIn PDF document text
    • https://texasbordervolunteers.org/userfiles/file/13928141559.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/fimaw.pdfIn PDF document text
    • https://swalaya.in/userfiles/file/jubawufevizozisi.pdfIn PDF document text
    • http://flemingdecal.com/uploads/assets/file/jagamudaganuxevutuw.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161356421d48e0---pinuvowi.pdfIn PDF document text
    • http://entryexpress.online/chapter_images/files/fatubisifal.pdfIn PDF document text
    • http://okna-kurska.ru/page_edit/_samples/userfiles/files/gibegokazojerut.pdfIn PDF document text
    • http://kqcme.yiaiwang.com.cn/upload/files/rulipewemevuxasomilirike.pdfIn PDF document text
    • http://5mal4.de/moneyvidya/web/images/userfiles/file/vezibovalox.pdfIn PDF document text
    • http://gasasosong.com/upload/fckeditor/file/18543991018.pdfIn PDF document text
    • http://nanchang.chinatupai.com/web/js/ckfinder/userfiles/files/defulamukide.pdfIn PDF document text
    • http://theartofdesign.nl/ckfinder/userfiles/files/sijakizolididivilufap.pdfIn PDF document text
    • https://stpeterscbs.ca/ckfinder/userfiles/files/navalisawe.pdfIn PDF document text
    • https://inoxquochoang.com/app/webroot/files/images/pages/files/ralalopurukuk.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16132309a6ea65---60309516457.pdfIn PDF document text
    • http://tlw.ro/UserFiles/file/napepimodozaruvana.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/c8b33iri572lu0gsnvf4p5lim3/nadopomujabakefebenipevit.pdfIn PDF document text
    • https://ehotelgateway.com/bot/ckfinder/uf/files/vajud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=fighting+tiger+download+apkPDF 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_off0000dbee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBEE 10656 bytes
SHA-256: d985a990792fb860aca31bda142912e5cd0ee402e3e689837d92f097c6e418b0
font_01_sfnt_off0000f412.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF412 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C24 17492 bytes
SHA-256: ac0098a45ac9b4eb6e88a8c5240a103051fac9ac35db9ba79a506325e89f25b4