Malicious PDF — malware analysis report

Static analysis result for SHA-256 198e93adcbc12918…

MALICIOUS

PDF

76.9 KB Created: 2021-08-13 20:59:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c93357444c2490b04e20c05e5064b425 SHA-1: c557d3eb6c091e61c3dd6558d82392b5d63abbf0 SHA-256: 198e93adcbc129183daac57e6aaefab7d117c58e69519bc158c8f1052d721af4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to potentially malicious content. The presence of PDF-specific heuristics like PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://queure.ru/uplcv?utm_term=ayurvedic+garbh+sanskar+book+in+marathi+pdf PDF link annotation
    • https://dudikom.pl/userfiles/file/40138287525.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/2179750343.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8b8104859b---33347659628.pdfIn PDF document text
    • http://immobilieninvestors.de/userfiles/file/182722757.pdfIn PDF document text
    • http://cheumst.com/upload/fckeditor/file/divigenuvavuwejexigolap.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db7fc4e6adf---pigibaziwezipeledikut.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/cd7405e96daa21b689c916f2b5f5eae0/28444099151.pdfIn PDF document text
    • http://wedooverseas.com/userfiles/file/paxajibikog.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160798a0eb538e---ziludubu.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/6bag8v9edv6i58g7o9ekqvata4/59012572487.pdfIn PDF document text
    • http://vita24h.com/uploads/userfiles/file/xasolemesaga.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/bepelonufulavi.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/16a10d510dc7b95cf5c769088639738a/49677996969.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/0ltg4groe63qntqaur8akkqi7q/16057662215.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/dd407ef7b90f9b602ef5bf4508f2da48/55614881182.pdfIn PDF document text
    • http://www.abcklima.hu//data/editorfile/63791069562.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/98340859844.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/dovem.pdfIn PDF document text
    • http://mrtowing.ca/Lawyers/userfiles/file/52854898436.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092a42fb38ef---22001171328.pdfIn PDF document text
    • http://bursaceyizgelinlik.com/images_upload/files/fidanusezanogi.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160f5d4aba1304---47865108307.pdfIn PDF document text
    • https://blugarden.eu/file/tanisobomuwavupan.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160840963a4061---73946288030.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_off0000c739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC739 16368 bytes
SHA-256: ff9c6455af5726b3a20008c55344e7b0b0c341f2727c81c1cc7a3b5d17a62dea
font_01_sfnt_off0000f12f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF12F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010946.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10946 11512 bytes
SHA-256: c8328ed709931dfe67bd90bb4ea71d3599609d3367fff106e59554dfbe09e053

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