Malicious PDF — malware analysis report

Static analysis result for SHA-256 33ef255eba79fdfb…

MALICIOUS

PDF

72.7 KB Created: 2021-09-27 13:19:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f2cdfa3483d3a9ace0a143a2ac28cbd0 SHA-1: 9cd6194a815055fe9ee210387892b97b90e58bdb SHA-256: 33ef255eba79fdfb653248617fd7069913665dc6d00a7e8f0ec11e7e1ed86293
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate effort to create a network of links on potentially untrusted domains.

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 http://extrastyle.ee/ckfinder/userfiles/files/gedoxubuxaduwem.pdf In PDF document text
    • https://www.premiumtrade.ro/ckfinder/userfiles/files/suzujibivir.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/4f1276eb47554fb36e314eb2a90defa9/78915753272.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/ffa9a5b4c000eb6829d176889f498826/nifujalalu.pdfIn PDF document text
    • https://delaneyllc.cfonewsletter.com/ckfinder/userfiles/files/romitiw.pdfIn PDF document text
    • http://finance-bulldog.cz/UserFiles/File/13165177832.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/67033606538.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/2725504523.pdfIn PDF document text
    • https://e-ssuances.com/ckfinder/userfiles/files/74086123599.pdfIn PDF document text
    • http://85560891.com/upfolder/e/files/20210908230601.pdfIn PDF document text
    • http://pcccphucvinh.com/upload/files/90417782268.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141fb457ebd2---jakavinafutepoxejaxow.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137e7fe3ed16---73924594175.pdfIn PDF document text
    • http://yanartextil.com/firma/files/74333834728.pdfIn PDF document text
    • https://pabxlg.com/userfiles/file/90813376661.pdfIn PDF document text
    • https://drhuanghair.com/uploads/files/202109270401366407.pdfIn PDF document text
    • https://weyergans-hcc.lv/userfiles/file/mapuwexumeromuf.pdfIn PDF document text
    • http://salonmysliwskirys.pl/userfiles/file/farotegub.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1613f6e1bb79fd---ziwewukugarumoposuge.pdfIn PDF document text
    • http://wenxuezj.com/images/File/29899442785.pdfIn PDF document text
    • http://www.humillacionyestrella.org/ckfinder/userfiles/files/96399862736.pdfIn PDF document text
    • http://fishtech.org/uploads/userfiles/file/file/14884861247.pdfIn PDF document text
    • http://iwayman.com/uploadfiles/file/210914011635579395ynuybu.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210927121821.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=telephonymanager+android+10PDF 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_off0000b7a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7A7 10824 bytes
SHA-256: c350ead382fa4a6ad85572cd048d770754be1f0c816f32fd3e79656faa4c0150
font_01_sfnt_off0000d030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD030 17304 bytes
SHA-256: d251e5f1eba8d58d9a5fbbd74678b483429ebc86b2393286211260bb8d8851e6
font_02_sfnt_off0000fcd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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