Malicious PDF — malware analysis report

Static analysis result for SHA-256 2544ac7c4c140be7…

MALICIOUS

PDF

79.4 KB Created: 2021-07-15 18:24:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 42c7087f700a774c1cd3e7a92a5842b6 SHA-1: afe885be93e03e4c3ea11995a363bd516f0e7110 SHA-256: 2544ac7c4c140be7e74bb3d2e4a8013bf9e81db8cc13fd857c405431bfc750cf
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm with numerous URLs pointing to potentially compromised websites, a common tactic for phishing or distributing malware. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns indicate it's designed to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4210

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://mcleod-bobbitt.com/clients/64742/File/9936821661.pdf In PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/1df247536579697091c5081eeac3741c/fomediwuvonupoxegugak.pdfIn PDF document text
    • http://sh-ruiyangcpa.com/userfiles/file/2021-6///20216235591344.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abc7fa511d9---duzasewixixenexinunos.pdfIn PDF document text
    • http://anhopphat.com/uploads/files/venalirogowanokarafata.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6b097baeed---50365195519.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/e8p5569j3i23tv5iss29q05s8p/72351998112.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c254c0b171---nekukitewexiresekamobos.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609687f7f3b7e---xuvojusotimuwezapika.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/lt8tgd3nj127u46a28lh31iu52/75207235184.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/7ba3efacacd0f3899ecaa0a19aea25ab/nilemef.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160868cf02dfbc---komelupulu.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/49313ba419abcaf36544661d15b4de1c/56741151315.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3091c6254---juzeguvejivimiwani.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b1721c7b174---58864656731.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/6cf94d14942c97e445bab0537502c71f/gidixidod.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070bcf41f1e1---jasowun.pdfIn PDF document text
    • http://findplusltd.com/file/27970595713.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/464de342a177a9ced83b3e6bf5410a38/fatexosidiguk.pdfIn PDF document text
    • https://hostsolutions.ro/app/webroot/files/userfiles/files/kulaleboju.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/97dc1e0a6b1790dff11c3bcde6c06253/95932303522.pdfIn PDF document text
    • http://clinicoral.com/img/userfiles/files/66926749826.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/46020505606.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=most+populated+prison+in+the+worldPDF 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_off0000f8b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B4 10668 bytes
SHA-256: 4db7771f0c20206970bcdca7bb552d8fcc32c13677008f4e43e643ac43984307
font_01_sfnt_off00011125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11125 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1