Malicious PDF — malware analysis report

Static analysis result for SHA-256 6761302d0b3d5f10…

MALICIOUS

PDF

76.5 KB Created: 2021-08-12 09:07:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: cccdd85bdfad6b886a5142867bf0eeaa SHA-1: 214dba2eba64f5f892be6c5bdcfe8aceda7d5646 SHA-256: 6761302d0b3d5f10480b43846bb47231aa2ee2d7bc0092dd36b69d793f7e8b10
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 0.9907

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 http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/70484216785.pdf In PDF document text
    • http://maxgear.cz/webpagebuilder/ckfinder/userfiles/files/xotosufomeke.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dfb772b0a00---nevojid.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/957bc44a862aca0fe36bedcf69dec157/bodajizop.pdfIn PDF document text
    • http://orvosvalaszto.hu/uploads/files/kagamolixuto.pdfIn PDF document text
    • http://graphicyazd.com/ckfinder/userfiles/files/sakabigitidofimavokus.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa75cea3fa---55612395190.pdfIn PDF document text
    • http://wrhs1967.org/clients/6/61/617565fc8afb9cc6d18abf932d248b7a/File/2400771089.pdfIn PDF document text
    • https://netron.pt/app/webroot/media/files/ziririxorifemalur.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb7e8b29ef3---37255484035.pdfIn PDF document text
    • http://turnyras.lt/Files/file/28586361641.pdfIn PDF document text
    • http://x-site.by/upload/editor/files/davodedeguf.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b9d94598204---sepururutepumaz.pdfIn PDF document text
    • http://sanmorales.es/userfiles/files/28661768213.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/begaxef.pdfIn PDF document text
    • http://asianaccounting.com/admin/fckeditor/userfiles/file/61969891287.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/49227mndtu3j4jq4m4ajtn0cq1/nakomamibusofovu.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/sgdv5ieal2vrijodnvbq9cpcsb/bepotupixujuvuju.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad97a12b3ab---3472691053.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/19075208290.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/lasozimasimezadane.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/214ea782ed10ec1e3937a48713d3f2b9/28546690056.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/vasubajenedu.pdfIn PDF document text
    • https://skvacations.com/userfiles/file/79625151068.pdfIn PDF document text
    • http://kowalstwwo.pl/public/cms//images/file/31067423063.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/wepekulizisezasus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=vertebrates+and+invertebrates+worksheets+for+kindergartenPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f76d2c435a---62132447180.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_off0000c720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC720 15996 bytes
SHA-256: 1df8d0718e5181033ce836c2a94a552ada9ac7ed16eb43251633e057b8325f7f
font_01_sfnt_off0000f070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF070 10940 bytes
SHA-256: 5556a636b08f24da8e3926cfbf20ada67391023d7d171646c4fd69dfa935ff1f
font_02_sfnt_off000109a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1