Malicious PDF — malware analysis report

Static analysis result for SHA-256 875a8d1e666202dd…

MALICIOUS

PDF

87.9 KB Created: 2021-09-21 22:15:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 36ff0683b41996d6e704f77472227276 SHA-1: d6df42baaf62030b9f81003f31cf722c321ee7df SHA-256: 875a8d1e666202dd6f116b34910bb5d29f0e6237b2f9dca73c065a92dbb4ec16
196 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a phishing lure, specifically a 'Browser extension / update installation lure'. It contains numerous external links, many pointing to compromised WordPress upload storage or disposable hosting, suggesting an attempt to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the exploitation of the user's trust to download further payloads or steal credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://coretry.ru/uplcv?utm_term=pc+chrome+for+android PDF link annotation
    • https://spcinternational.in/ckfinder/userfiles/files/72096778865.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161392d5eec103---jajab.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/mejelejebalekewabivi.pdfIn PDF document text
    • http://www.ags-sib.ru/ckfinder/userfiles/files/kusikek.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/73836960773.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/userfiles/file/fijadunok.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614087501454e---wepulezup.pdfIn PDF document text
    • http://tongkhomica.com/upload/files/15093166171.pdfIn PDF document text
    • http://sinhorelli.com/userfiles/file/3829343805.pdfIn PDF document text
    • http://spokoino.ru/i/upload/files/70906066492.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614a2cd75e991---40915483527.pdfIn PDF document text
    • http://red-persimmons.com/upfiles/editor/files/50485405556.pdfIn PDF document text
    • http://minuspk.ru/minuspk.ru/userfiles/file/siguku.pdfIn PDF document text
    • http://hatowo.com/app/webroot/uploads/files/56219366792.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/35a0f98b5d254741c2c8b897a7271ac7/41828180383.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/voloxet.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/66975379507.pdfIn PDF document text
    • http://cautrucpalang.vn/webroot/img/files/48726219845.pdfIn PDF document text
    • https://careerroots.net/ckfinder/userfiles/files/48986343807.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/2350207033.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/pefuxij.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1e2fa1eb9---fasasofabubomumajitezaz.pdfIn PDF document text
    • https://wsbtitan.com/images/file/wobasi.pdfIn PDF document text
    • http://brukikostka.pl/uploads/page/file/suwogowosazevazewasaw.pdfIn PDF document text
    • http://elskenecologie.nl/files/kenaromulux.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/161301bcbf2085---6695047378.pdfIn PDF document text
    • http://americasbestwingsbeltsville.com/uploads/files/widifedupafa.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_off0000f546.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF546 17784 bytes
SHA-256: beba91146fd71a0ca7ccf5d507b193f8d15db8f3bced2fd068eb867625889210
font_01_sfnt_off000122a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013aba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ABA 10432 bytes
SHA-256: e2a43d9bfa0cd8a5161a469e03296f27dc95e25e0abdeb508659b955078a7cfa

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