Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ff0be6931681474…

MALICIOUS

PDF

81.8 KB Created: 2021-09-17 05:54:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1e77ef0eccd3afa1ee9c7421ca731e13 SHA-1: e844543f6eea0ffd43630577d04bfcd765a3c148 SHA-256: 0ff0be6931681474832f6aca6bafb777be7ca5e7e0861145ee91872e040a7cc1
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised websites or disposable hosting, suggesting a phishing or malicious redirection scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

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://chcial.ru/uplcv?utm_term=kof+2001+plus+apk PDF link annotation
    • http://fuzoku-kyujin.jp/ckfinder/userfiles/files/18606630658.pdfIn PDF document text
    • http://inarchengineering.it/userfiles/files/82253811345.pdfIn PDF document text
    • https://araprinter.com/ckfinder/userfiles/files/gatojomikifuvemubu.pdfIn PDF document text
    • http://skybuildinfraprojects.com/uploads/11148654528.pdfIn PDF document text
    • http://xy-interior.com/uploads/files/202109050433041144.pdfIn PDF document text
    • http://thegioituigiay.net/uploads/files/ripigatewaje.pdfIn PDF document text
    • http://qataminational.com/uploaded_files/userfiles/files/besimofetisol.pdfIn PDF document text
    • https://optimumquestsolutions.com/ckfinder/userfiles/files/setofumug.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/161431a8c055c8---vixisudisitudavojip.pdfIn PDF document text
    • https://channeloflove.com/ckfinder/userfiles/files/bebezadel.pdfIn PDF document text
    • http://cozycornerexpress.com/uploads/files/2887958125.pdfIn PDF document text
    • http://xn--eyt274i.com/upload/files/juxawovefawesowu.pdfIn PDF document text
    • https://braindevelopmentmaps-org.neurondevelopment.org/userfiles/files/23475535500.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/ad27c46397f6ee019e26501f6b538af2/rotubuzu.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/67bd3c36ef3ccf36e42a0a7f18e55ee4/45310511730.pdfIn PDF document text
    • http://cuadepthanglong.com/images/ckeditor/files/13592075218.pdfIn PDF document text
    • http://hansungid.com/userfiles/file/1253396467.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/da0a91e1aaeedf37deab8600b49f4ccc/zonatarikewusoparuzasimu.pdfIn PDF document text
    • http://saiprogetti.net/userfiles/files/dawepanida.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/14955664998.pdfIn PDF document text
    • 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_off0000d7ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD1 10304 bytes
SHA-256: 5ed2919d50ae32cd94977bd70e58998ce0d71939bcbc5dae958fd7fe651db3a1
font_02_sfnt_off00010748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10748 19368 bytes
SHA-256: b55b4254f7fd0e4209114c1f0ea974d714d7bca921ab02112a6ec3941b2023b3