Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c540868b09cc6b2…

MALICIOUS

PDF

76.0 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: 8d6075acbba81c9bd4e63fadaea4ce9c SHA-1: 070d5ca2c325b3a12297bffe9aae6a9b28d7b490 SHA-256: 9c540868b09cc6b24581a8001ac947f0334c97b724db6baa613b88f13612a45f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the ML classifier's high confidence score further support its malicious nature, likely serving as a lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://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
    • 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_off0000be04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE04 10700 bytes
SHA-256: c0a88a135e12d8edfa1a436631423b43a2a29933de759eb098ceeb6f10d0f6cb
font_01_sfnt_off0000d68c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD68C 19712 bytes
SHA-256: 2564d48ea2aba9df9a8d9d8cb60beac6fffb38c1a7e9a3dfe1c4c88d2b464989
font_02_sfnt_off00010a61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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