Malicious PDF — malware analysis report

Static analysis result for SHA-256 7720ca9ec7cd638c…

MALICIOUS

PDF

71.2 KB Created: 2021-09-25 12:27:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c98910bd8be4f0b43163723e75b20796 SHA-1: b9fed7e92fedc62e389e4da4beb523cc9a3152e5 SHA-256: 7720ca9ec7cd638c774adb5545dbb13a63d72967bac6bcf752567f251a782530
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting a link farm or phishing lure. The PDF's structure and embedded URLs are consistent with attempts to redirect users to malicious sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://smidgel.ru/uplcv?utm_term=periodic+table+pdf+with+all+details PDF link annotation
    • http://spbmedax.ru/sites/default/files/uploads/borobusunilibevew.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/52597709561.pdfIn PDF document text
    • http://szcftz.com/upload/49406151705.pdfIn PDF document text
    • https://imotrading.com/images/userfiles/faragowikizeniwo.pdfIn PDF document text
    • http://nincity.de/inline/file/niwafaputupedijojosot.pdfIn PDF document text
    • http://furnitura-syndicat.ru/ckeditor/ckfinder/core/connector/php/uploads/files/34969115814.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614ed868ef7ee---furoravokopalu.pdfIn PDF document text
    • http://duocthientam.com/uploads/ckfinder/files/xalokovepakikumepa.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/ketijiterubalubibeze.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1614df86fb6920---fipegiwuxuj.pdfIn PDF document text
    • https://3rproject.eu/ckfinder/userfiles/files/nimomoselalefosozapiborov.pdfIn PDF document text
    • https://csmgh.net/pevron/www/img/file/milovilo.pdfIn PDF document text
    • https://www.bmo-agencement.fr/ckfinder/userfiles/files/tuzesepowebika.pdfIn PDF document text
    • http://librojuridico.com/aym_images/files/gelawaxabenejilezaresuze.pdfIn PDF document text
    • https://12shio4.com/contents/files/85867117398.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/82133199456.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/84997031276.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/36693160993.pdfIn PDF document text
    • https://seas2010.cienciaevida.pt/site/upload/file/pumolewevizu.pdfIn PDF document text
    • http://dentistturkey.com/image/files/muteborubovifimojazi.pdfIn PDF document text
    • http://yjsyrj.com/userfiles/file/ferosatavefabizu.pdfIn PDF document text
    • http://tantusmarina.com/UserFiles/file/sejafuwifuwovuvenepopemin.pdfIn PDF document text
    • http://confidenzacsapagy.hu/upload/videwaro.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e8524a79cc---36785339279.pdfIn PDF document text
    • http://eltprof.ru/userfiles/file/dofitudazasok.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_off0000b446.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB446 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC5D 10840 bytes
SHA-256: bf4db137cd9e1aa483d9b1f73aa51a45c41ab4fa5139d9be214ca80a8af63204
font_02_sfnt_off0000e553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE553 16288 bytes
SHA-256: f9e3941ad5bda6863790094fdc76b0d2b9b6820775e13654ff3794499ef94659

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