Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b08347febb6a577…

MALICIOUS

PDF

80.7 KB Created: 2021-09-12 07:29:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6666e4768f6b2a9af2f3fd0ed34694f6 SHA-1: a3c7cf29676bbf16f8ca754740810a7bcb29cd3f SHA-256: 9b08347febb6a577ea47ebe9ae538fc860312bf55e6f7537d176ef69f820c4b3
156 Risk Score

Malware Insights

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

The PDF contains numerous links to various websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://netwindowvn.com/uploads/userfiles/file/falaji.pdf In PDF document text
    • http://vsrru.ru/userfiles/file/fufos.pdfIn PDF document text
    • https://dhins.com/testingsites/advantage_aviation/assets/media/file/81533481762.pdfIn PDF document text
    • http://scro.ru/pic/file/24408758670.pdfIn PDF document text
    • https://www.renfrewareahealthvillage.ca/ckfinder/userfiles/files/82024481656.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0f48e5875---12526070784.pdfIn PDF document text
    • http://leebyunghun.org/new/upload/board/files/bomogobivizajadosuvizo.pdfIn PDF document text
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/xopupaxujurovesi.pdfIn PDF document text
    • http://ramenhajimetustin.com/uploads/files/67384667318.pdfIn PDF document text
    • https://chungangroup.com/uploads/files/202109041255362186.pdfIn PDF document text
    • https://dom4m.by/userfiles/files/fomufaje.pdfIn PDF document text
    • http://isystem.hu/userfiles/file/sozodagegujoxumoz.pdfIn PDF document text
    • http://zlzljc.com/uploadfile/file///2021090708080565.pdfIn PDF document text
    • https://middletonchambers.com/ckfinder/userfiles/files/15446073286.pdfIn PDF document text
    • http://tw-sincere.com/upfiles/editor/files/kapizipotakogomepatomel.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/2cffa69e9b324c871959c4aca9a88b91/disowogo.pdfIn PDF document text
    • https://phu-komplex.pl/pliki/file/podev.pdfIn PDF document text
    • http://brucemayrockinstitute.com/assets/ckfinder/core/connector/php/uploads/files/57545342947.pdfIn PDF document text
    • http://chochosanencino.com/uploads/files/31245083145.pdfIn PDF document text
    • https://codecs.ro/images/file/rupusone.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/26420cf01cc34c14c743ed5dac0efa83/74778476378.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/74972515744.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/74908550971.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=alternative+mail+app+androidPDF 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_off0000d8e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E6 10432 bytes
SHA-256: 50fa3d7f0987407b21f30944b3129674cd1fa1da63abe7db3a8c6cea218dda16
font_01_sfnt_off0000f078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF078 17316 bytes
SHA-256: 2ad2c26611c6cf276e82c7339dc1ab66f1020c891b659e578f159d5cfefdf088
font_02_sfnt_off00011d3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1