Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9405db4e2d97c2d…

MALICIOUS

PDF

72.1 KB Created: 2021-08-29 06:58:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 8be9eec49d22963552e07a3bbb7f8863 SHA-1: 1de2eb603871224255d9accd128c99552d48b081 SHA-256: f9405db4e2d97c2d464a66e3d9fa3cbfe186f873883ce032cc29f510486139d1
124 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content. ClamAV detected this file as Pdf.Phishing.Trojan, further supporting its malicious nature. No scripts were extracted, and the document body was unreadable, so the primary attack vector is the embedded link farm.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4750

Heuristics 5

  • 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
  • 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://laureysnv.be/uploads/files/lepoz.pdf In PDF document text
    • http://nhs-carpediem.com/clients/46367/File/48687232490.pdfIn PDF document text
    • http://bachova-terapia.sk/images/file/vazuxilavela.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/tifaludapesakanozax.pdfIn PDF document text
    • http://poetische-malerei.de/web/editor/files/xelijopamivekazilokom.pdfIn PDF document text
    • http://turhantur.com/turhantur/files/69857448645.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/9483215458.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/motrctpu0lvc2h4r77p3n29e6b/ribufilolikuv.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/161218bad76000---21909181329.pdfIn PDF document text
    • http://brno-skoleniridicu.cz/ckfinder/userfiles/files/zusiz.pdfIn PDF document text
    • https://protectname.xyz/whoisprivacy/userfiles/files/faponev.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160887ee9cda8d---zabofivofetivamefape.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160bbee75ae7f5---tesixadezulitivirewefebu.pdfIn PDF document text
    • http://studiotecnicoprato.eu/userfiles/files/witisi.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/9cf6898dfe3074e2a1b9d64746ea0566/74825931742.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d8960a7b27b---19398294691.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/dca242c7cbb87ac5f9f64e5f2ca3d96b/76601344247.pdfIn PDF document text
    • http://teckim.it/themes/userfiles//files/38334311453.pdfIn PDF document text
    • http://ibb-online.ru/f/file/6326164719.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/5c2adbcf538c81e6b318cccfcadca91e/6389868743.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/maver.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/bdc62fc8b24121e0cb2c3fcb05992293/96771451995.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16094333396693---12798612970.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=rules+for+fasting+on+ash+wednesdayPDF link annotation
    • 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_off0000d99d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD99D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1AF 18068 bytes
SHA-256: 8b5d0a289a16855e5b5b056011f92ee0d0023216b75436b0f85faec1f5ab10e2