Malicious PDF — malware analysis report

Static analysis result for SHA-256 e93c2e4230552e35…

MALICIOUS

PDF

78.8 KB Created: 2021-08-29 09:47:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 0324f77a851618ed68d8aad2e48985df SHA-1: 38b911111842ab4cbe62bee266270c5ef0c8ef88 SHA-256: e93c2e4230552e3587aba4c04345b0f160621ac36e80aded396fb898c4721e08
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608df3e40b0e5---52353649967.pdf In PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160cb140b70ea7---solenovurifawatis.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/luwizatewuxika.pdfIn PDF document text
    • http://beerskiboot.de/img/upload/file/bifuzaxagokupunujuko.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a27a1d2d17---6595549046.pdfIn PDF document text
    • http://alexanderkanevskyartistbiography.com/clientMedia/file/56686840405.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/160742e476d05f---zuzos.pdfIn PDF document text
    • http://hengtaixin.com/HangShun/ckfinder/userfiles/files/kozimikonetimevuvalutarug.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/c9d97e7f52ebda8b41627ce7f209d2c8/bonib.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/rapukuxi.pdfIn PDF document text
    • http://teleinwestor.com/userfiles/file/12691007608.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/25fba7ea03481835288d5cbdd4513b88/68900658968.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/nalevejudowevezatijopi.pdfIn PDF document text
    • https://investincarpathians.eu/app/webroot/media/files/45365795279.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160afc33d4bdac---79720312270.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088496361e7a---295485489.pdfIn PDF document text
    • https://chokysitohang.com/Uploads/userfiles/files/25513692295.pdfIn PDF document text
    • https://odontologosmalca.com/images/userfiles/file/23345487185.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/jpk2iqo5kk6b7upm6kfep7abh3/4370345540.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160921ed737c62---jetefowitode.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/duguzavutuvuwotu.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16100331a6abac---subaretobujiribifalug.pdfIn PDF document text
    • http://spoilersmensgolfclub.com/clients/865201/File/gogisefavoronivetakoguw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+unshrink+cashmerePDF link annotation
    • 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_off0000d030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD030 17360 bytes
SHA-256: 18d93f3d6abccd11e76bd8eb90e160dd8c44ea96fa792b31b1ae860e01c30d01
font_01_sfnt_off0000fd03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD03 10716 bytes
SHA-256: 83f2c93b464dc6053c51fd24f7409fe3e8177d651556642bb51c519740641065
font_02_sfnt_off00011584.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11584 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1