Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3fa4b3e480bbc54…

MALICIOUS

PDF

70.4 KB Created: 2021-09-25 06:45:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 90c8322013447cbc5b343c7dfbd2d1b1 SHA-1: c03d8188b7b8d25f27e32054ceeb2f04f318045a SHA-256: a3fa4b3e480bbc5470ac1c5130ccb8616d0d369d07a2e671ca29b38e40bd4b27
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or are hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with a malicious document designed to lead users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://dentali.cz/files/files/20931811842.pdf In PDF document text
    • https://szallas-karpatalja.hu/upload/wibexudozogepapexukulaz.pdfIn PDF document text
    • https://limberhurstgallery.com/imageuploads/file/nojuwelagajagetifom.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e69a0073c2---66788703343.pdfIn PDF document text
    • https://nomortiga.com/contents/files/dodigazirulokijol.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/putoxixeb.pdfIn PDF document text
    • http://cnsgawefgl.netsociality.com/upload/files/sabis.pdfIn PDF document text
    • http://ukonlinedirect.com/userfiles/files/zutujuxitegigoja.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/mutewamedepusupel.pdfIn PDF document text
    • https://linker.tw/files/pazizozulopuja.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613706b722f5c---zefivadejekazogixaguvuzo.pdfIn PDF document text
    • http://stromzeleny.cz/file/fopazoleje.pdfIn PDF document text
    • http://gachtrangtritranvinhtin.com/gachtrangtritranvinhtin/Images_upload/files/32592378545.pdfIn PDF document text
    • http://ajej.pretty-match.com/upload/files/14048417387.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/78741658938.pdfIn PDF document text
    • http://ibookingkr.com/FileData/ckfinder/files/20210923_53E1D715CA390011.pdfIn PDF document text
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/30070014182.pdfIn PDF document text
    • https://toyotaautobody.com/ckfinder/userfiles/files/92919135227.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/af16357111ab9e79dd011c09ce260828/95769726391.pdfIn PDF document text
    • http://www.workbythai.com/admin/assets/images/76085212879.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/993522b32a66cdbce9b6e4b037ff7aa1/jenusapivokizupi.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/98207993032.pdfIn PDF document text
    • http://spbi.cz/res/file/92697967214.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/71105b7811a25929d140ecafe36f22b4/fowuwiloxori.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=sky+background+for+editingPDF 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_off0000b378.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB378 15732 bytes
SHA-256: 9c3be9b3a931251867fe4e9b679cce9c6e12747dab0f8c96ed8270ececd94ea0
font_01_sfnt_off0000da78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA78 10960 bytes
SHA-256: c5d796ca6643ca31c4aa8e2be14934c072928e0a7f2be0e206b8273beb73008b
font_02_sfnt_off0000f3e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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