Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f7d90bc2e07354f…

MALICIOUS

PDF

81.1 KB Created: 2021-09-18 06:07:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f906801155f4f3ab45e64888df3d1354 SHA-1: 4c5aa7427997ef9352021b56adf04045b25c8e95 SHA-256: 8f7d90bc2e07354f156ad702e4c35209ad7a8f50fdbc0e0fee287060bec38749
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised CMS upload directories or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5466

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://archism.ru/uplcv?utm_term=icse+class+4+maths+book+pdf+free PDF link annotation
    • http://www.farmaciapenil.es/userfiles/files/vamuvuxoxofubiwigub.pdfIn PDF document text
    • https://ecodiagnost.com/ckfinder/userfiles/files/45609873488.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/xupus.pdfIn PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/jebixuwilemibivujavika.pdfIn PDF document text
    • https://arch.ua/ckfinder/userfiles/files/gofosumokuzadikiretirenov.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba2057b4de---85963646385.pdfIn PDF document text
    • http://plymouth-logs.co.uk/ckfinder/userfiles/files/87912270244.pdfIn PDF document text
    • http://bige.vn/uploads/userfiles/file/77044749888.pdfIn PDF document text
    • http://wedooverseas.com/userfiles/file/14500224136.pdfIn PDF document text
    • https://granitabrasive.com/editor_up/parekutodebiwotajukonis.pdfIn PDF document text
    • http://contelex.it/userfiles/files/vekuxuxatodusesu.pdfIn PDF document text
    • http://honeystraw.com/uploadfiles/file/batosefofefasep.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/6f29f844c47f4f8c57d58194972fdc7a/segisalojirefum.pdfIn PDF document text
    • http://thecuriosityshot.com/kubat.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/vopuvopewekepovu.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16144c00c0ae5f---ditepajamukemoniradazewe.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/10027880233.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/31671947931.pdfIn PDF document text
    • http://sun-marche.com/app/webroot/js/ckfinder/userfiles/files/wefigigudurikajeju.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161358181e0b69.pdfIn PDF document text
    • http://studiovalecchi.it/userfiles/files/mazuxegefatejuvovarile.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/f9cd5f60b91ad025e202786faebb7934/bazazudanikuv.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/1674890669.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/riluk.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/d1dcc817c856a84288d3d04a9f42e82c/murokugibepilapetu.pdfIn PDF document text
    • http://sangiorgioautoservizi.com/userfiles/files/vemofag.pdfIn PDF document text
    • 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_off00010f2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12744 10948 bytes
SHA-256: 44d84b0afaf53c0e6498ad36a767994f5d1fb5aeb76473599c560163695678cd