Malicious PDF — malware analysis report

Static analysis result for SHA-256 09bb600d1d4a7f89…

MALICIOUS

PDF

67.8 KB Created: 2021-09-19 00:06:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a3dda2ac2cc4a83c0ff11f2c95a37cae SHA-1: 64657db36d8540b0566787ef2a9fc5b53b11d0bf SHA-256: 09bb600d1d4a7f8968e44264a5e249383fce8b68acc05b5ca54b8dc80fee902d
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 websites and link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to download malicious content or engage in phishing. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5690

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://www.39koratmachinery.com/file_upload/files/wibenezomo.pdf
    • https://cevhertemizlik.com/userfiles/files/70306834130.pdf
    • http://dtjxbpzx.com/filespath/files/20210908074945.pdf
    • https://reviewz.eu/app/webroot/files/userfiles/files/zokere.pdf
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1614311768e9a7---ginavivewibura.pdf
    • https://naucharts.com/ckfinder/userfiles/files/30405975833.pdf
    • http://lnianemarzenie.pl/userfiles/file/27320456238.pdf
    • http://muzycznescyzoryki.pl/userfiles/file/katoleliwaxekawunigozi.pdf
    • http://tipkeo.com/js/ckfinder/userfiles/files/6719524494.pdf
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613edbea39ac1---lelelumavutakuzovag.pdf
    • http://lor-rostov.su/userfiles/files/soromuribet.pdf
    • https://urbanlivin.lu/userfiles/files/10089939517.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/161362bfc53ca2---ranewufepotemetupesatoda.pdf
    • http://saraiaser.nl/userfiles/file/jexovap.pdf
    • http://golfproradost.cz/webpagebuilder/ckfinder/userfiles/files/getexomotot.pdf
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/aun1nbfhv72p2nnhvdopl2ocv1/nitivowusevuxapuditer.pdf
    • http://lecostationery.com/files/file/zixoganokamixuvaligemij.pdf
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161337d82c8905---pefapo.pdf
    • http://studiomilano.eu/userfiles/files/kulerebeg.pdf
    • http://dailyxedayhang.com/userfiles/files/4511646378.pdf
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/41qqo1158flksdek68759l7v3b/78612449243.pdf
    • http://hfnhsw.com/upload/files/82498559275.pdf
    • https://oncallanatomist.org/ckfinder/userfiles/files/38430321979.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16137c0bd9024a---xidusan.pdf
    • http://werder-ritter.de/UserFiles/File/83463709975.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=movie+maker+download+for+pc
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c073.bin
91e0332b945d712c9b8b1c21bfefb956c636b3fbbe230ebcc2676e292e34f2a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC073 10752 bytes
font_01_sfnt_off0000d92b.bin
220a752bcf52a7b1c0a330573b73dda82ae5800f2ebf8c3de1b61c4d3e068795		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD92B 16672 bytes

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