Malicious PDF — malware analysis report

Static analysis result for SHA-256 95b8315b0e336f20…

MALICIOUS

PDF

105.3 KB Created: 2021-09-02 09:46:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 88c506ba6a0d5846376cd05ed36f09be SHA-1: af2f758ae7fb3731d2c6d8adb58523e2d4cd9ead SHA-256: 95b8315b0e336f209aadb2d260fe250879be88e325288e2337eecd334fcb0425
124 Risk Score

Malware Insights

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

The PDF file contains a link farm directing to multiple compromised websites, identified by heuristics such as 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. ClamAV also detected this file as 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0'. The embedded URLs are likely used to lure users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier clean score 0.1785

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/0120c9189ed89db05d3a50b462311daa/20082786755.pdf In PDF document text
    • http://irths.com/upload_files/files/poledewiwirepugutumugini.pdfIn PDF document text
    • http://czerwoneiczarne.pl/files/file/24728721277.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/vudiruvilapov.pdfIn PDF document text
    • https://ap-qatar.com/userfiles/files/pevadilapopipexujo.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/moxazefidosasawukeg.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160812d6829ce8---620290516.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c6da3815c8b---26298394706.pdfIn PDF document text
    • https://nadinerogger.ch/userfiles/files/mazira.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/76664071848.pdfIn PDF document text
    • http://khiconghoixuancong.com/Khicong/admin/userfiles/file/jemufofun.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a30a324b91c---dexolilodit.pdfIn PDF document text
    • http://gardatrans.com/content/Files/55353573296.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/ddff036190561e5c5458b17e2cd3ba16/rekamadavefajuket.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/368b3683518a9b7fe9df5737bf904b41/5666339358.pdfIn PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/zipitegejufaziz.pdfIn PDF document text
    • http://rhodeislandalpha.com/clients/56223/File/poleladav.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/43191183180.pdfIn PDF document text
    • http://xiaohecollege.com/d/files/82380782331.pdfIn PDF document text
    • http://thegioidahoacuong.com/uploads/image/files/nejurogevokumodagadamuxat.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16094173d268c1---96226327465.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/2a40df2f66b5da2736f83898b6ac8c28/90666770092.pdfIn PDF document text
    • https://webshopplus.nl/app/webroot/files/userfiles/files/kewobutogisipazomuvo.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/282346238033.pdfIn PDF document text
    • http://ornito-silesia.eu/userfiles/file/mevepofajo.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/n0jt2ucv04jg8hab303hg2aid6/gumonawiwozowokuza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=immanuel+kant+most+famous+bookPDF 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_off00015aa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000172b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x172B5 18720 bytes
SHA-256: 82891256d934ca18a579842cde52b8be45a288ac3dddc69e5cf09b33df1a7930