Malicious PDF — malware analysis report

Static analysis result for SHA-256 6524de67db660ece…

MALICIOUS

PDF

80.7 KB Created: 2021-09-06 13:02:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a208c7ed2c58bd881a402e17e7f94bb0 SHA-1: 2cfc2ea63b45bd643f5a0bfb20b20a8102768e49 SHA-256: 6524de67db660ece1f52d1464adcc41cc2ad25ded6094df5a987f6e1d9042502
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. It contains numerous links pointing to compromised WordPress upload directories and other potentially malicious sites, suggesting a phishing or malware distribution lure. The presence of many external URIs and link farms indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://cructi.ru/uplcv?utm_term=comma+review+worksheet+pdf PDF link annotation
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bd798137632---15370714870.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/d2jc64fqtnif4sa2ms2q9eaeh1/22270375529.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/72207260947.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202108101207289229.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/zidefogiroladaw.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/foturewuboxakudu.pdfIn PDF document text
    • http://cga82.com/admin/File/budekofabegixalale.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f458586a7a---85348396140.pdfIn PDF document text
    • https://limblength-sldf.com/userfiles/file/lowif.pdfIn PDF document text
    • http://immopolignano.lu/images/25929030221.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16087b54536ca1---xujojefaxogatuko.pdfIn PDF document text
    • https://nissanzorba.ro/ckeditor/ckfinder/userfiles/files/32377541056.pdfIn PDF document text
    • https://regaluxiluminacion.com/uploads/assets/file/pugaxupobowezabufevid.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/q1tisnje9d9eklnv20r20qb4j0/71670048992.pdfIn PDF document text
    • https://pharmalogindia.in/ckfinder/userfiles/files/99936867875.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/a0ba7ded619f688665214da0c2afb5a9/misudile.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607315e6edd65---88692593177.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/fokawufolobilosazegoga.pdfIn PDF document text
    • https://horgaszvelem.hu/ckfinder/userfiles/files/82469997410.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/7901t479ec0i73p5c79s6ofe7m/zotidebedutagokiseniti.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/vesofuwonuku.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/17714187084.pdfIn PDF document text
    • http://phanphoiongnhuahoasen.vn/upload/files/mowap.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16078c8fa23a86---10025865750.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609175ac8be7a---35546992769.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1lp5ole9bt732fmnjlcvh1cvp6/74747062980.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_off0000d8b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B0 10888 bytes
SHA-256: 26e30a4b29523c8cfd146eaf674804272afcc23bafe9a974fa0ecb1e5ac4ea36
font_01_sfnt_off0000f200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF200 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A12 16828 bytes
SHA-256: bf101a5aee7e3d58e8783efaed9a93f09ddc7d68d5b637d921a441f8a7458fcf

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