Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfe91e88cbaed3c0…

MALICIOUS

PDF

60.6 KB Created: 2021-09-17 22:25:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e9886690e06bcda9cfcc1b910f8a1351 SHA-1: 3aa07c6ad9ba280f1bd04832ec6baa23c54ea641 SHA-256: cfe91e88cbaed3c0b39a8b7dbb745fdee40829d642f8424ab6493bd163315199
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7193

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 https://oniceh.ru/uplcv?utm_term=euro+train+sim+mod+apk PDF link annotation
    • http://sualpturizm.com/userfiles/file/xulovodugiluzukavew.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/62003328561.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/nupudidowuritinugozep.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613d31a10a68d---mevawimu.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613788ba10a19---watagagurul.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/18191517667.pdfIn PDF document text
    • http://www.bash.cl/media/file/nazokeko.pdfIn PDF document text
    • https://delphin-bau.com/ckfinder/upload/files/44233922202.pdfIn PDF document text
    • https://kozlovka.mebel18.com/uploads/files/75262555878.pdfIn PDF document text
    • https://novamakine.com/upload/ckfinder/files/zogadoxoroxedoxifinila.pdfIn PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/62239201582.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612f22b613268---bemavatedowuwu.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/28f215f92f37df106c45dde0ea0de11a/47885011669.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/b337605b2c515b26a3a595f3d8229e5f/labanixojiwitupuworeril.pdfIn PDF document text
    • http://ksklinika.ru/ckfinder/userfiles/files/25849914729.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/1078063908.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/gamapezagalogodoviwoni.pdfIn PDF document text
    • http://auburn-properties.com/userfiles/files/16712526504.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/17b205d5489bb58361297da7f9f6c79e/fujimogerapemoxubatero.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/dubuwudiva.pdfIn PDF document text
    • http://sigmabhp.pl/userfiles/file/53223365651.pdfIn PDF document text
    • http://www.slenderclub.cz/ckfinder/userfiles/files/jogigoxunitimufor.pdfIn PDF document text
    • https://ddtoyz.com/ckfinder/userfiles/files/36386596174.pdfIn PDF document text
    • http://fotostudiovaccari.it/userfiles/files/20016678500.pdfIn PDF document text
    • 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_off0000ce11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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