Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e6e403beee427f2…

MALICIOUS

PDF

69.3 KB Created: 2021-09-08 19:29:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 94181cb24ebea1f16fcd21dc00f23378 SHA-1: edbd4be72b20ff9e99ddc845ad9838b172baa390 SHA-256: 3e6e403beee427f20b7f3499d8694256f2db0feb2cab04acfd3d3be673fe578b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The primary purpose seems to be redirecting users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6770

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 https://wastran.ru/uplcv?utm_term=noun+pronoun+agreement+worksheet+with+answers
    • https://vkgnassociates.com/dayafter/uploadimages/newsimages/file/gamas.pdf
    • https://kungfuclasshongkong.com/louis/taichi/ckfinder/userfiles/files/detatazajazizuw.pdf
    • https://floridainvestment.cz/files/file/12958338349.pdf
    • https://bhavanarayanaswamy.org/userfiles/file/76638461733.pdf
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/3994c272552dc9ba6ceaa2218340bb2e/56533315106.pdf
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/74438073079.pdf
    • http://sinoorchids.com/image/file/nibavorarixononezupe.pdf
    • http://artpolinakuzina.ru/pict/file/kifakoxiweze.pdf
    • https://greenbins.ca/ckfinder/userfiles/files/zekitusowakiko.pdf
    • http://utcsp2.rustyramone.com/uploads/files/loforexo.pdf
    • http://mywayrtk.info/userfiles/file/wumewefarol.pdf
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee3dfa4dfc---purubewolavudegod.pdf
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/5a89b4c53a7be792779f215bfd79017a/49212468207.pdf
    • https://uzsienis.cvzona.lt/resources/img/files/15588278206.pdf
    • http://hydrem.ru/images/file/ruvukebefefupusuvopan.pdf
    • http://wcsps.com.tw/ckfinder/userfiles/files/27121671387.pdf
    • https://peoplesmodelinternational.com/ckfinder/userfiles/files/67386239568.pdf
    • https://suativisamsungtaihanoi.net/upload/files/bolofifotuwogoz.pdf
    • http://tpdw.pl/userfiles/file/23571721666.pdf
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/d480c878c61287b46e315e80a04169be/24505598536.pdf
    • http://stauarchitetti.eu/userfiles/files/62045576929.pdf
    • http://machulski.com/public/file/dowaserimerer.pdf
    • https://turdv.ru/SITE/files/editor/file/23355668493.pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d814.bin
d80c63e1db9fec636a80e3ab5124fdb226133ad864fe0cff3419bdd75eb8eaed		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD814 18096 bytes

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