Malicious PDF — malware analysis report

Static analysis result for SHA-256 0463c2220f761268…

MALICIOUS

PDF

89.7 KB Created: 2021-09-14 04:35:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 866022b232cee1ee017f19024e925cdb SHA-1: 30b72bbb4750bb4726c0a2ae5644049396f13602 SHA-256: 0463c2220f7612685734c9eb0360f8848d3fd44b72f7bef2e6c5cef86de54df2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous links pointing to various domains, many of which are hosted on disposable or compromised WordPress sites. This suggests the document is designed to act as a link farm, likely to redirect users to phishing pages or download further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://rasciindia.com/firetech/ckupload/files/41826790021.pdf In PDF document text
    • http://lsphc.com/userfiles/file///nezaguvokovibefonevaxa.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/68044070206.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/i9ak95usepunjo4q714t81ahi7/35313512755.pdfIn PDF document text
    • http://uts.edu.co/portal/app/ckfinder/userfiles/files/25334372751.pdfIn PDF document text
    • http://thechelseaff.com/user_uploads/files/faxifokuduxoxanaf.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/bekunoxosaxodalekewi.pdfIn PDF document text
    • http://duoctruongxuan.vn/userfiles/image/file/5599474003.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16131163c2a9e3---fefudadotidas.pdfIn PDF document text
    • https://stl-log.com/htdocs/cljr/data/files/toketuduwefajataka.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/zabogajupijesawibesif.pdfIn PDF document text
    • http://mywayrtk.org/userfiles/file/60200887078.pdfIn PDF document text
    • http://rapabzenec.cz/obrazky/files/sazimiselotapaw.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613277cf38cca---63337883214.pdfIn PDF document text
    • http://vngo-cc.vn/cooker/public/files/zunogefenigeweti.pdfIn PDF document text
    • http://kvrhousing.com/uploads/75924719703.pdfIn PDF document text
    • http://rickgrisolia.com/userfiles/files/12337804870.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/kiruzuzebupetafujaxabidab.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/powamogex.pdfIn PDF document text
    • https://himarco.ir/basefile/himarcoir/files/61349658549.pdfIn PDF document text
    • https://123natura.com/stockages/files/dotaf.pdfIn PDF document text
    • https://quangcaonoithatgiahung.com/admin/webroot/upload/image/files/zojokuwurukapomefonuxuf.pdfIn PDF document text
    • http://otworz-biuro-podrozy.pl/userfiles/file/42455300077.pdfIn PDF document text
    • https://sssmri.com/ckfinder/userfiles/files/narijilediletuwobijibexa.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133919550ef0---zokimafumimunevu.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/nizibavis.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/lagosolapaxojowumo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=unturned+black+balaclavaPDF 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_off0000f90e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90E 10388 bytes
SHA-256: ab67646268d6f5ece27c29d33b936e8bc66f9208ab78a23129b641a132697199
font_01_sfnt_off000110ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128CC 17924 bytes
SHA-256: 9acafc717c64bd0674a5efb4f08d368d12b025dd25dedc1e7dab215249765d7e

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