Malicious PDF — malware analysis report

Static analysis result for SHA-256 b372d13b2848613d…

MALICIOUS

PDF

70.3 KB Created: 2021-09-08 23:00:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 20c1acc1d28d13d6b67375c509e5f11d SHA-1: a9c2c11b5e6028682e34a858920b8b6f65f19bd5 SHA-256: b372d13b2848613df7da04bf94728f0e405a2f2ddd5af510f6f2c2cf229386df
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple distinct hosts, some of which appear to be compromised WordPress sites. The embedded JavaScript likely facilitates the redirection or download of a secondary payload, while the link farm serves to obscure the ultimate destination and evade detection. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9156

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 http://wcsps.com.tw/ckfinder/userfiles/files/bosogiwulefejabuj.pdf In PDF document text
    • http://gvs-russia.ru/admin/ckfinder/userfiles/files/47213700070.pdfIn PDF document text
    • http://ekorepetycje.eu/Upload/file/vesefedaterodofufigi.pdfIn PDF document text
    • https://irepairplus.nl/app/webroot/files/userfiles/files/wakavuvuxifemaxobigiwaja.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jomejabufonemofufisetu.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/584a9abf140d3cb730df8750bddcee91/92069430735.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/44282831845.pdfIn PDF document text
    • http://cu-mbc.com/ckfinder/userfiles/files/86727315027.pdfIn PDF document text
    • http://hefei.chinatupai.com/web/js/ckfinder/userfiles/files/poxikewuwusogiwuni.pdfIn PDF document text
    • http://portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/68276465223.pdfIn PDF document text
    • http://haiannweb.com/uploads/files/xikemelotisotej.pdfIn PDF document text
    • https://almentispharma.com/ckfinder/userfiles/files/50827888621.pdfIn PDF document text
    • http://prasongp.com/file_media/file_image/file/97907941418.pdfIn PDF document text
    • http://pneusmarene.it/images/file/dologujej.pdfIn PDF document text
    • https://tw-itemaos.com/ckfinder/userfiles/files/25621334199.pdfIn PDF document text
    • https://capecoralliving.com/media/file/19493655956.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/ba1203ef98dfccfccb01e48de98d739b/refedasamekegal.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/161327f999c24c---18625331793.pdfIn PDF document text
    • http://jdjcnc.com/upfolder/e/files/20210908223824.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/xikuzamutabigegi.pdfIn PDF document text
    • http://aedjtjdshbf.pretty-match.com/upload/files/92021622258.pdfIn PDF document text
    • http://www.smartusb.info/images/library/File/dosup.pdfIn PDF document text
    • https://mmtours.si/uploads/24817504294.pdfIn PDF document text
    • https://jagamimpi.com/contents/files/23845915169.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/16131b03d39cd5---takukikarivolefam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=idm+for+android+crackedPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8B 10368 bytes
SHA-256: 214b19a64475c817f536d796e83d4447b28ab496c3bcb80bd64ee92707a2f31c

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