Malicious PDF — malware analysis report

Static analysis result for SHA-256 300dda38640ae385…

MALICIOUS

PDF

79.7 KB Created: 2021-09-20 02:35:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3f51d5751f93ffaa32fb96eac81f26f3 SHA-1: b3e480cfc5259c018ac313a47454dffb5311b093 SHA-256: 300dda38640ae385f50988641e2cb2b77ed8ebd037291a5dfff7e562faae2e47
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to lead users to phishing or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7217

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 http://tehla.eu/userfiles/file/runezorexugudixob.pdf In PDF document text
    • http://dejede.com/userfiles/file/12462330540.pdfIn PDF document text
    • https://maymac.info/userfiles/file/3954689164.pdfIn PDF document text
    • https://homeuu.biz/upload/ckeditor/pages/files/senovifazufokopof.pdfIn PDF document text
    • http://simsvizag.com/admin/uploadedfiles/file///romifeken.pdfIn PDF document text
    • http://stmarysharipad.com/userfiles/file/47637078617.pdfIn PDF document text
    • https://www.babetravelling.com/ckfinder/userfiles2/files/77434108417.pdfIn PDF document text
    • https://sunpower.lv/ckfinder/userfiles/files/99332948582.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16130fd7c1782a---7099812735.pdfIn PDF document text
    • https://rintrans.com/files/97354143659.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/15773498887.pdfIn PDF document text
    • http://neonatal-surgery.ru/userfiles/files/zibulapegorekobivapeva.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021090704521738.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/cksetrtu48an412s367ddu9fbo/wukik.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143752226486---83917916178.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/tedor.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/tinomodo.pdfIn PDF document text
    • http://jn-zhsc.com/upload/78467314839.pdfIn PDF document text
    • http://tostonet.cl/ckfinder/userfiles/files/badelunisaki.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/lozudodalesozemaze.pdfIn PDF document text
    • http://union.travel/ckfinder/userfiles/files/49096939161.pdfIn PDF document text
    • https://nepalfinepashmina.com/userfiles/file/385532581.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/73471065157.pdfIn PDF document text
    • http://firsttimehomebuyerstudy.com/images/file/59130411387.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/190e0ae299eabc93c028606845c48186/jujuwejiremo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=pomelo+file+explorer+apkPDF 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_off0000def3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF3 10344 bytes
SHA-256: a6e762fa5c472f80f2092a0c6e2817521408aceeabe6c707d69c595f5357397c
font_01_sfnt_off0000f642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF642 22496 bytes
SHA-256: e7d3d8a34b14bccbee938707e43a697832999b27ed1e4e024f89a2e9d1cb19a8

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