Malicious PDF — malware analysis report

Static analysis result for SHA-256 53fd1ba193e01315…

MALICIOUS

PDF

75.7 KB Created: 2021-09-15 22:32:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 39edcc0045812b058a7733c10852745b SHA-1: b71814daae171aa54fd15b30ee440bacc56e037f SHA-256: 53fd1ba193e0131530031b468371ead0e9d2d89138e35d2a88716d68bbd81049
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically identified as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, forming a link farm. The primary purpose appears to be redirecting users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://greenbins.ca/ckfinder/userfiles/files/limuxonogabofazanif.pdf In PDF document text
    • http://quangcaosmsgiare.com/media/ftp/file/didunafoda.pdfIn PDF document text
    • https://bodymason.com/user_uploads/files/komuwasipawoxagidolaxe.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16132b37a12b77---30696882879.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/nezumi.pdfIn PDF document text
    • http://www.americaninvest.net/upls/files/vupufebuba.pdfIn PDF document text
    • https://8foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/madoko.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161418f7830256---93828692730.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/84506772710.pdfIn PDF document text
    • https://mtestbd.com/assets/uploads/files/xaxaxovenon.pdfIn PDF document text
    • https://5uempat.com/contents/files/lidexid.pdfIn PDF document text
    • http://jrecchina.com/ckeditor/ckfinder/userfiles/files/jadakinosabedelorabolulo.pdfIn PDF document text
    • https://jocafoto.com/fotos/file/wijafijido.pdfIn PDF document text
    • http://musicfriend.vn/public/default/ckeditor/files/23370628883.pdfIn PDF document text
    • http://aorganboys.handyfriendship.com/upload/files/tozuzifanufezitoralavuvo.pdfIn PDF document text
    • https://htchninc.com/d/files/12706872414.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/59915878538.pdfIn PDF document text
    • https://www.la-melodie-des-saveurs.fr/ckfinder/userfiles/files/40166246203.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/retunagatuxi.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/61203217428.pdfIn PDF document text
    • https://wasael.com/userfiles/file/73405063208.pdfIn PDF document text
    • http://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/94370555537.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139cc8540eee---90046052702.pdfIn PDF document text
    • https://tideandtigers.com/ckfinder/userfiles/files/sivosafuzit.pdfIn PDF document text
    • http://thegioimaychaybo.com/app/webroot/uploads/files/zalome.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=gaana+music+premium+mod+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_off0000bfdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFDD 10764 bytes
SHA-256: f6316d72ae7986099205614f85fde2a88e799975924f295ee7d70cf373ad5722
font_01_sfnt_off0000d890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD890 18176 bytes
SHA-256: 6f0af6a25059d914a5035a1c85b62721ddfa19f4d41842a4ae0666645e8250c2
font_02_sfnt_off0001088a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1088A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1