Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7094cc85f40aa6d…

MALICIOUS

PDF

47.7 KB Created: 2021-09-25 10:55:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ad0389f0800cb4730c65ac9c0292b837 SHA-1: 44459b7034b58546d372acaca0d619b228d33915 SHA-256: b7094cc85f40aa6d8d97a98b198cfde6e28314b416fef56f68d36caba2a610ea
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads or disposable domains. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this. While no scripts were extracted, the nature of the URLs suggests potential phishing or drive-by download attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7448

Heuristics 5

  • 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
  • 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://crysiq.ru/uplcv?utm_term=gymnopedie+partitura+piano+pdf PDF link annotation
    • https://nangluongvada.com/uploads/files/98005684485.pdfIn PDF document text
    • http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/purefilizozajupa.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/cba7372330eb22a92af4b4d2577138e8/vilafutifibinutoxawa.pdfIn PDF document text
    • https://sistemagestiondpr.co/userfiles/file/gasuxovuseseduvipig.pdfIn PDF document text
    • http://suncitygroup.ir/basefile/suncitygroupir/files/6415580524.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614af00680721---kotirabozadowimuwaparip.pdfIn PDF document text
    • https://andhimazhai.com/images/files/95104051417.pdfIn PDF document text
    • http://www.dgtrans.co.th/login/ckfinder/userfiles/files/80614855563.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.com/userfiles/file/28005032464.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/megipupigowugivenigapage.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/tunemakodikegog.pdfIn PDF document text
    • http://deleersnijder-bocaege.be/images/file/dukuzewofujakujige.pdfIn PDF document text
    • http://dalhousieretreat.com/cote_dor_import/admin/ckfinder/userfiles/files/17979964896.pdfIn PDF document text
    • https://rockyhotelsgroup.com/uploaded/files/pateviwitojefuweri.pdfIn PDF document text
    • https://icbacademy.com/upload/files/voreronugonapuponuboxemo.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/9b545c75516c02b93c56386e5cdda27c/19637856548.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/67035459243.pdfIn PDF document text
    • https://chataigne-cevennes.fr/imgs/files/nerurizof.pdfIn PDF document text
    • http://auswallendorf.de/userfiles/file/nupeluvegelavav.pdfIn PDF document text
    • http://officeharbor.com/pdtInfo/26048445570.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612eccfceba37---latuvalukakileloda.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/44227868447.pdfIn PDF document text
    • http://thcscatquea.hoaiduc.edu.vn/ckfinder/userfiles/files/35762335066.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/44285325178.pdfIn PDF document text

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