Malicious PDF — malware analysis report

Static analysis result for SHA-256 3985c05559b9d7bc…

MALICIOUS

PDF

67.8 KB Created: 2021-09-05 08:13:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: d4916c051f715aff9f985d06fa884513 SHA-1: 8c5fb6119d02c6405aafe75cc32087a74c818eba SHA-256: 3985c05559b9d7bcff8f2b46d4476ad29532a08fd9851193900a60ce1d9e5e25
154 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment. No scripts were extracted, but the structure and URL analysis strongly suggest a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5668

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://asupuro.com/user_data/image//file/10110155174.pdf In PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/ba3b2fb2f7aa0b937f7b35943acb5760/80161815065.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b8109836c12---ruboxepu.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/se9j9pren6g5jstm8rltvjl1tp/89060576774.pdfIn PDF document text
    • http://shreyaghoshal.com/konadnew/userfiles/file/22098260551.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9af7804a97---zadimajufevizotobedi.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5fcc096055---zexixipagaluvukelo.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/3620m8n6d0qfnijfa8ridi33fj/bisosunowimi.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f252b9c281---52509387418.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612dd3d8ce05c---sonagaxuwatiset.pdfIn PDF document text
    • https://davidfauquemberg.com/home/fauquemb/david/bbdg_site/userfiles/file/gipedekamiwigibetimi.pdfIn PDF document text
    • http://ourgans.org/userfiles/files/83948267596.pdfIn PDF document text
    • http://korsorlampang.net/user_img/files/badupapovurikiwumezeru.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/8341279661.pdfIn PDF document text
    • http://ericshartman.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lupifokutebinubevomerodu.pdfIn PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/vekekaxuditixexi.pdfIn PDF document text
    • https://drsaman.com/files/72101763386.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/9960o72h6afnk82b5r6a200gq1/32832880897.pdfIn PDF document text
    • http://dzstock.com/Upfiles/file/memalemotamawe.pdfIn PDF document text
    • http://controldellaves.com/app/webroot/arxius/file/15895134434.pdfIn PDF document text
    • http://wecans.net/_UploadFile/Images/file/vominozowituj.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/ninisaxizojufi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=countries+and+their+capitals+and+currencies+pdfPDF 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_off0000d520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD520 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED37 10848 bytes
SHA-256: 9578e2b17a13a28c292a7e24f986ca15b397f38d4a80b8332281ff6f473efa18

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