Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bf4dd834c422bdb…

MALICIOUS

PDF

71.2 KB Created: 2021-09-25 07:26:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1ee3cc8d5b4f5dcf6637ebe2698d1f4d SHA-1: d3af7f29089eb067164ce081d3271031013a222c SHA-256: 3bf4dd834c422bdbb650bdb61d8361b668e101164253a8f52ea98a1e35616956
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users. The presence of ML and ClamAV detections, along with the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM', strongly indicates malicious intent, likely to distribute malware or phish for credentials under the guise of firmware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://eminenceinc.com/userfiles/file/xatejalemax.pdf In PDF document text
    • https://promise-land.com/upload/file/44831153095.pdfIn PDF document text
    • http://ternovykh.ru/content/file/lalozabiko.pdfIn PDF document text
    • http://fillaracingacademy.cz/ckfinder/userfiles/files/gakivuxakegunezamo.pdfIn PDF document text
    • http://sindikat777.ru/ckeditor/ckfinder/core/connector/php/uploads/files/kupupaxidifugomame.pdfIn PDF document text
    • https://nayyaralidada.net/alpha/ckfinder/userfiles/files/lifejelalemizut.pdfIn PDF document text
    • http://www.jfac.kr/ckfinder/userfiles/files/giwixo.pdfIn PDF document text
    • https://soudurelauziere.ca/upload/editor/file/vujaleruxem.pdfIn PDF document text
    • http://sportsbettingconsultants.net/cote_dor_import/admin/ckfinder/userfiles/files/39461590389.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146b6527afc4---42162197458.pdfIn PDF document text
    • http://lngpetro.com/userfiles/file/linexexilepoba.pdfIn PDF document text
    • https://pcetravel.com/files/file/44458927789.pdfIn PDF document text
    • http://sumbulefendiegitimvakfi.com/resimler/files/81255159952.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/46800016896.pdfIn PDF document text
    • http://tetrafluoro.com/upload/files/22445514985.pdfIn PDF document text
    • http://videlec.be/ressource/file/gasorom.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/327926808241631083651.pdfIn PDF document text
    • https://manorhair.com/uploads/files/202109121946428771.pdfIn PDF document text
    • https://lbk-ingatlan.hu/uploads/file/64310734163.pdfIn PDF document text
    • http://hostingureitings.lv/uploads/userfiles/files/90354086247.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614aef28eaea2---wiludireterib.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/16133aa61e5990---11372999867.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/38141591838.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/46833740812.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=download+firmware+samsung+galaxy+young+gt+s5360+indonesiaPDF 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_off0000b122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB122 11696 bytes
SHA-256: f40442170ea24b69b6636d50fb939c03aa63dd9bf2c4ca44a10a63e61014449c
font_01_sfnt_off0000cce8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCE8 16308 bytes
SHA-256: 56340cf5af9972199b5b11296ab2b86b9c86554527347e30a6c8c13cd48f46bb
font_02_sfnt_off0000f66f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF66F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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