Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dfce74cde96631e…

MALICIOUS

PDF

84.4 KB Created: 2021-09-19 09:05:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b95592d04a9507d94d2e3a2894c74c1e SHA-1: d0e744618e9fe2c8cb391fc81f9ddb0122a9cac9 SHA-256: 9dfce74cde96631e6ed8b70788a7d38e793cd08b35ca0d342a8e650f2c0fef75
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics and an ML classifier as malicious, specifically as a phishing or trojan distribution vehicle. It contains a large number of embedded URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://univerosg.com/ckfinder/userfiles/files/ratipijolubumifusimatuban.pdf In PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1614342de6d94f---92037215923.pdfIn PDF document text
    • https://fullprotec.com/ckfinder/userfiles/files/78800838953.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146ca41c8df0---99393281199.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/f3df3b72cd345a2d308736c8c7a273a9/juvizajo.pdfIn PDF document text
    • http://groupementpecheduloir.com/ckfinder/userfiles/files/xozifasetomuwibiduwi.pdfIn PDF document text
    • http://casms.org/atts/news-files/file/wopodasamoxepofar.pdfIn PDF document text
    • http://salwex.hu/file/mopizowunofe.pdfIn PDF document text
    • http://www.la-rocca.pl/app/webroot/files/files/54019775629.pdfIn PDF document text
    • http://stonepigments.com/userfiles/file/tuxadamexodar.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/28106070227.pdfIn PDF document text
    • http://studiobaldizzone.com/userfiles/files/gatenabesirovokik.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/23873106704.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/90663432130.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/jr4j9u5v2ajhbnlkqbt6ofp59s/xobuvevabitovunajijever.pdfIn PDF document text
    • http://crestviewshopping.abwingsmd.com/uploads/files/rizidajazonunola.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce4ee0b1c8---62224084786.pdfIn PDF document text
    • https://aaaxxion.info/images/file/koraxor.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/zuresupagodugegesoziribiz.pdfIn PDF document text
    • http://hoilhpnqbthanh.com/upload/file/66431922976.pdfIn PDF document text
    • http://open.ua/uploads/ckeditor/files/54780786105.pdfIn PDF document text
    • https://hyosung-gulf.com/uploads/file/tiluwek.pdfIn PDF document text
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rujakej.pdfIn PDF document text
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/03053936672.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=imo+hd+old+version+2020+downloadPDF 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_off0000df34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF34 19688 bytes
SHA-256: df2cecbad852af244e73f6c8bbb813b37bc053748e0224177ddc663da59aa156
font_01_sfnt_off0001134a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1134A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012b61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B61 10760 bytes
SHA-256: 0cedfc8ded4560ea21768ae2e844d94e9e8732574f7d17673a588f1d937fc9e3

Open this report in the interactive analyzer, or submit your own file for analysis.