Malicious PDF — malware analysis report

Static analysis result for SHA-256 9788357ffa167994…

MALICIOUS

PDF

82.6 KB Created: 2021-09-16 16:26:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4c3b7bcf7e17816e6cdcb5f3f121b629 SHA-1: 3b2742a9d66eb4a6b7dfefaf21e4d54bdabe74d5 SHA-256: 9788357ffa167994d69cbb193cf2141864ff7925ef62548ae091c5d60a9b806f
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of multiple PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM firings indicates a clear intent to use the document as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://drafthe.ru/uplcv?utm_term=pokemon+heart+gold+download+pc PDF link annotation
    • http://sbairs.com/datas/files/27787420716.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137b4ca34e0e---20433521607.pdfIn PDF document text
    • https://mokshadhamnepal.org/userfiles/files/22481294779.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/3658846049.pdfIn PDF document text
    • http://sonhanint.com/uploadpic/sun/files/202109131006247421.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16142076a0d2c8---lesajobekonexoxakitoginod.pdfIn PDF document text
    • http://zhuxintrading.com/uploads/ckfinder/files/20210909/16311596964687.pdfIn PDF document text
    • https://manpowernepal.net/ckfinder/userfiles/files/19842988899.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/duvemonekewik.pdfIn PDF document text
    • http://studioriggio.it/userfiles/files/64390478707.pdfIn PDF document text
    • http://kimhoatra.vn/upload/fckimagesfile/71913029496.pdfIn PDF document text
    • http://longtra.vn/userfiles/file/sipuwuburobapira.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133258e4fdac---jajikobabuj.pdfIn PDF document text
    • http://arcomproltd.com/userfiles/file/rojeselatagadibodap.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/fanadesat.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/16fjtkpjsv1s2nnvv29m5ghpq6/67907550240.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/68124239508.pdfIn PDF document text
    • http://fkhd.cz/data/img/bekisefijapomivulatifejed.pdfIn PDF document text
    • http://dailymaytrogiang.com/userfiles/files/42311540827.pdfIn PDF document text
    • http://cssh.es/img/file/lesodipewinamanodagas.pdfIn PDF document text
    • http://hoadondientu-ptp.vn/images/ckeditor/files/17742829193.pdfIn PDF document text
    • http://hkwwta.org/userfiles/10457811367.pdfIn PDF document text
    • http://dlabiura.kbo.pl/ckfinder/userfiles/files/72268477095.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_off0000db14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB14 18872 bytes
SHA-256: b8c6f4805402031691527325be802b8d7667e1fddd7e05e5d5185799014ab6a0
font_01_sfnt_off00010c1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12432 10880 bytes
SHA-256: 3f6697fb2ca9ead1c090c563acdb570220b83a3ebf55ef48e47bbcd4be6e21bf