Malicious PDF — malware analysis report

Static analysis result for SHA-256 568140af5ac0639b…

MALICIOUS

PDF

82.3 KB Created: 2021-09-01 23:14:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: fb797bed13d1072d5675634eb5f89622 SHA-1: 72e138ece8bf5001aef1f9f7a501e1e4be897725 SHA-256: 568140af5ac0639b1591bc376e00b3efd5e1ad425f8cb3de644e7c9197c31a36
132 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2722

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://pistant.ru/uplcv?utm_term=the+term+physiology+is+related+to PDF link annotation
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160e8f4aa2fbb3---kipale.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075176a54f12---wafekopivome.pdfIn PDF document text
    • https://mmszke.hu/files/file/41719711232.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076a480d4480---28365503580.pdfIn PDF document text
    • http://shiksha24.com/userfiles/files/legofumofefexizilu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a896bf93689---63244211137.pdfIn PDF document text
    • https://sportnazona.bg/f/uploads/files/370544131.pdfIn PDF document text
    • https://cantarefides.ro/admin/userfiles/file/77032106098.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/020addceb403cbe827fcebd6612f2e19/46253847624.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/290893uhqfd2ube2vgvpjddsj1/5717705442.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/ea6cd0165e6b56dad1538ae4e9cb71be/lojomekewezuw.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b489305f6c8---wemanofoj.pdfIn PDF document text
    • https://666666.vn/upload/fck/file/lumonab.pdfIn PDF document text
    • http://fitviewer.com/files/file/39479810374.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/jusevanimowez.pdfIn PDF document text
    • http://prestizhstroycompany.ru/SITE/files/editor/file/xawepewopetopubego.pdfIn PDF document text
    • http://anchor-m.com/js/upload/files/nuterusesuxebi.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c86377d85af---zonijivezovivinevalara.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/59f63d7df0baa8f975dad734364bff56/kojujigevadewa.pdfIn PDF document text
    • http://karmand24.ir/basefile/ehotel724ir/files/11000732076.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a048a6238a3---66146676419.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/f66bmddfd8e66d9jnnbu1p7s3i/dinofanilefugipoji.pdfIn PDF document text
    • http://carnavaldemarbella.com/Senegal_5/Content/files/userfiles/file/vezotakofetivoresu.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/81dbe46571df55907f24cd4078e3477a/poxadufetimos.pdfIn PDF document text
    • https://www.geya99.com/ckfinder/userfiles/files/84201328961.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/31818723543.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA8 10812 bytes
SHA-256: a4023c28ea7873a0b991bae9343f12a6ccdd81a44d696a02f2ed5cc901af9ca0
font_01_sfnt_off0001086f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1086F 19320 bytes
SHA-256: 157f852f9aa88be5ed2e5fe6052b078a0215e860027b174c04bfce672ab0dcce