Malicious PDF — malware analysis report

Static analysis result for SHA-256 e90d7446ad77cd0b…

MALICIOUS

PDF

85.2 KB Created: 2021-08-20 19:35:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e599fba80d695ae870c29f6354556a51 SHA-1: bda98bd2de02c1b1efb45fb0ca853b935b76aca4 SHA-256: e90d7446ad77cd0b8aee960d81abded83e234de532281cf7f8a2e2f8a570aac5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised CMS upload directories. This suggests a phishing or malware distribution attempt by leveraging these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://gma.ge/admin/ckeditor/ckfinder/userfiles/files/82592809190.pdf In PDF document text
    • http://starlightcelebre.org/clients/4/43/43e9139217482d7666ce300faf566241/File/dotewudotemokuxotaf.pdfIn PDF document text
    • http://vncdata.net/app/webroot/uploads/files/17895951396.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/tagijexop.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160853cce53d2b---vexope.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607daf3ecfa17---62303268148.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d97e2648d0---zifumurogajogokesamuta.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/0244b0f91a7692a1fde493832a68de96/56778393733.pdfIn PDF document text
    • http://tt-ural.su/admin/ckfinder/userfiles/files/jizewumatav.pdfIn PDF document text
    • http://papinchess.ru/userfiles/file/lozevowefawepujamusigep.pdfIn PDF document text
    • http://atek-ent.com/upload/file/98066899009.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/46527774178.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c03252c26c8---xeterosifimiduwezav.pdfIn PDF document text
    • http://win-sonic.com/kida2018/ck_imgs/files/39362717737.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/4b43c0e7d733e5767d53a0d8bcd3e786/76030237754.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/234a97ccd0aafb156da4ff156a8a1614/46387556504.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb84135e45---31316163801.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/77004064228.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/bc05v1upkorromsvkc67rah613/zewetubig.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16099c223e2480---85013484756.pdfIn PDF document text
    • https://ibrahimkoc.com/images/Media/files/kogavubizomutiguja.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/ef6416fb23f76dbace9cb456ed30f2a4/lituxezupepotenabezazif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=ver+pelicula+los+pasos+perdidos+onlinePDF 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_off0000e60e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE60E 18332 bytes
SHA-256: 4603181c1947137ece1dea0aa1b9b95233d63a1171c31a00d3cffdfcc8748b77
font_01_sfnt_off000113fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012c13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C13 10476 bytes
SHA-256: 1d371fe284128fae720e4f12f6d1549e32b6d7a7f82c5dc28b20f4c73153a9c5