Malicious PDF — malware analysis report

Static analysis result for SHA-256 c10827b7b54a4057…

MALICIOUS

PDF

70.3 KB Created: 2021-09-05 08:52:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1469f527beeb4df87d21eba0f2744a2f SHA-1: 452a3ef66cd9ffa1d46db5ba0b04bbce4661d817 SHA-256: c10827b7b54a4057164cde85c80c4f5369ad71d10e42b7176a78e7c70d98d54f
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm used for SEO poisoning or phishing. The ClamAV detection as 'Pdf.Phishing.Trojan' further indicates malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics strongly suggest the document is designed to trick users into downloading further malicious content, likely through a phishing or social engineering pretext.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2573

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 https://residenciasanamaro.es/userfiles/files/mimuse.pdf In PDF document text
    • https://bellcera.60km.com/upload/files/legexet.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/36408617683.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070027e1c789---juruw.pdfIn PDF document text
    • http://cjmjwarrickhudsonfamilyreunion.com/clients/9/9b/9be434dcd9982d5451de1b36a82eb828/File/tilebanopazu.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608a1e08ea6b6---98439985373.pdfIn PDF document text
    • https://mygoaltv.org/ipp/images/uploads/files/marawivafenen.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/c18bdafd9c4a44967cdffc6edc66fcb5/jifipunanajenun.pdfIn PDF document text
    • http://dxczx.com/ckfinder/userfiles/files/20210704_130815.pdfIn PDF document text
    • https://t2sc.me/userfiles/tilutiponifenukuvawedob.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/zepofog.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a70448796e7---9106293683.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160be737eee926---91723210767.pdfIn PDF document text
    • https://gulfb2b.com/userfiles/file/pazumobuzor.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b85015d06d6---4775146088.pdfIn PDF document text
    • http://coyada.com/up_images/up_images/dojurirupetezo.pdfIn PDF document text
    • https://andrejc.si/files/file/wixufogorozerebelama.pdfIn PDF document text
    • https://hsiaoying.com/userfiles/file/63952358136.pdfIn PDF document text
    • http://karunb.com/UpLoads/files/misazupulexi.pdfIn PDF document text
    • http://stl-hk.net/userfiles/kumunogo.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/piviw.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/54161153660.pdfIn PDF document text
    • https://sherwoodchamber.org/ckfinder/userfiles/files/75688166064.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16110456c9080e---16686886896.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/d32ed726998b0309a6b654b6c25ce6c3/wefosuvojefixowadaraxi.pdfIn PDF document text
    • https://52fantasies.com/home/holly/public_html/ckfinder/userfiles/files/90531015523.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=kruti+dev+keyboard+layout+pdf+downloadPDF 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_off0000cae2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAE2 10912 bytes
SHA-256: 87659f2714f3a9359e3d8ce1e596afdaa6dc56c40da2bad9eac951a369efe11f
font_01_sfnt_off0000e414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE414 18724 bytes
SHA-256: 916d95cb0df01e93c0ab271dd2b4b6d85994e8c15e83900ccef972be9a17732c