Malicious PDF — malware analysis report

Static analysis result for SHA-256 6658b3022be35cc1…

MALICIOUS

PDF

83.4 KB Created: 2021-09-02 12:34:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a343bd2b9925aa0c0fa0304fb418b3d7 SHA-1: bbe0186ad6c397246fe40fa3729893875490ec9e SHA-256: 6658b3022be35cc1ce222848de2388612e5defa03c1d714a5d04d28d7e79d31b
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS upload directories. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a link farm on disposable hosting, suggesting an attempt to distribute malicious content or phish users. The embedded JavaScript likely facilitates the execution of malicious actions or redirects to these external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6981

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://garglob.ru/uplcv?utm_term=algebra+readiness+assessment+pdf PDF link annotation
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/9ff1f94f42c954e9ddd64886d642964e/20939530904.pdfIn PDF document text
    • http://fsanaq.com/upload/file/210706110728664002rxet7blok0ep.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16102cf0312f93---zugugaturul.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/5b1jg3ofbimsrkmtet863nul87/82803124324.pdfIn PDF document text
    • https://empezo.xyz/js/ckfinder/userfiles/files/ruxopi.pdfIn PDF document text
    • https://tkquiz.com/userfiles/file/38848263572.pdfIn PDF document text
    • http://irk-yoga.ru/upload/files/17856874041.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/16097ffd1dff15---tebabazametabipegipipaw.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608752b2c2c12---21429492053.pdfIn PDF document text
    • http://jerseybankruptcylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gebexaton.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/5e5658fce0c0ec1729846b93b89bf9bb/xuzexuvaxolewezo.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0f0a75370---37838277662.pdfIn PDF document text
    • https://immobiliaresancarlotrieste.it/file/bobogutamazusaxakidob.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/2230426907.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/79540670094.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/92857577738.pdfIn PDF document text
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tarapemuv.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160754d7cf04ac---radagorixexotakuvumebok.pdfIn PDF document text
    • http://pokeocncafe.com/uploads/files/18240046811.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/06p5plbjiotlihtrlaacc8nek5/tokegezuxulazapasasa.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609040488fc79---2474072017.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606df0be9fde7---vivezakesefele.pdfIn PDF document text
    • http://santabruna.cl/upload/file/bifiserufotugiva.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/89923935720.pdfIn PDF document text
    • http://gemwishrs.com/ckfinder/stones/files/52230762782.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_off00010aca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ACA 10840 bytes
SHA-256: f416f11cb6ffc305d06fb4115461a0338fcb25f47a3d63cbf516c1348f619ed6
font_01_sfnt_off00012358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12358 19128 bytes
SHA-256: c59e5adddd5a48d9cbd72b884bf09f159dc34f9433e6295aebb4ba3d22858224