Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ced929a3b04a6cb…

MALICIOUS

PDF

74.1 KB Created: 2021-09-16 12:51:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5709f12055f6dcde8be7d8b4a6f3057c SHA-1: 9e8d7fd0936912f28d32a9cf4c9d6245e07162f7 SHA-256: 3ced929a3b04a6cbd8aa4ed6b24097a6271dae5a2e31e32ed51446547d8ae155
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing a link farm pointing to multiple compromised websites, which in turn host other PDF files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of external URI heuristics and link farm indicators suggests the document's primary purpose is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1614060b7a82ee---nixidebisatisusiwuj.pdf In PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/34aa537536bd890078e1e2f90b6d8b45/90103566038.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135d61d32752---fonokase.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/13831732131.pdfIn PDF document text
    • https://centrumschoolka.pl/photos/file/laliraxadowutumorifu.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/161326249131d5---8851665016.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/fb7689259ab0e16ae619652c80282a0c/19224800954.pdfIn PDF document text
    • http://magiepourenfants.com/images/mediamanager/file/sazuboregi.pdfIn PDF document text
    • https://ermolino.mebel18.com/uploads/files/74977670763.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/xadokobuvojogiwuranapod.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/49974995907.pdfIn PDF document text
    • https://jcmimoveis.com/userfiles/file/wodefopozekifirituxu.pdfIn PDF document text
    • http://abbuffalowings.com/uploads/files/medaj.pdfIn PDF document text
    • http://thechitay.com/uploads/userfiles/file/zoridiwizobapodixaji.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/0pm8073a4c5evvhuv745j95j71/posemivisumir.pdfIn PDF document text
    • https://amatnieks.com/pictures/image/rebugusupezakujupalebelef.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613126c1970e2---95347050217.pdfIn PDF document text
    • http://digjamaica.com/app/webroot/files/zekudebevupunabu.pdfIn PDF document text
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/3674200076.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=droid+tv+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_off0000bfcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFCC 17608 bytes
SHA-256: 704646de130009b62c3da01aed58878fa426e349269a6334f3c745091f26c067
font_01_sfnt_off0000ecd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E8 10096 bytes
SHA-256: e17dc7ba2f6e659d9342913fed8460246cc80e92d54826b9b78a4daf2566cefd