Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ae8eae5fe37bc48…

MALICIOUS

PDF

67.8 KB Created: 2021-09-24 05:52:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b17cccc8c866fffbb48a38cdbda25ef2 SHA-1: aa596e111796c334987ff4f852396f70d4b7b580 SHA-256: 3ae8eae5fe37bc481b77ad7f8ffeb5978d8fa184af4f93e3db5a245ea9429894
162 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 contains an embedded JavaScript stream and numerous external URIs, many of which are part of a link farm hosted on compromised or disposable domains. The presence of JavaScript suggests potential for further malicious actions, such as downloading additional payloads or redirecting users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5838

Heuristics 6

  • 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.
  • 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 https://ketchas.ru/uplcv?utm_term=friday+after+next+gomovies PDF link annotation
    • http://gadkowski.pl/repository/filemanager/file/pekagefikeborenuxaguw.pdfIn PDF document text
    • https://mihalex.by/files/files/27565420898.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161300664e7d6c---9379787831.pdfIn PDF document text
    • https://theshamrockpublecco.it/file/dunum.pdfIn PDF document text
    • https://producedepot.us/userfiles/files/87920314260.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/lolajekube.pdfIn PDF document text
    • https://em.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/povude.pdfIn PDF document text
    • http://casavacanzesanvito.eu/userfiles/files/34957663125.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/8346268376.pdfIn PDF document text
    • http://misterholidaysanprisco.it/userfiles/files/zafibaraxotiwufegod.pdfIn PDF document text
    • https://promptcorporate.com/ckeditor/ckfinder/userfiles/files/48308753355.pdfIn PDF document text
    • http://police8coop.com/UserFiles/file/lijuvuraxugunomuxek.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/83440170104.pdfIn PDF document text
    • https://madame-tina.com/ckfinder/userfiles/files/10678397824.pdfIn PDF document text
    • https://renetravel.ro/images/files/nowemexizefufibumajifek.pdfIn PDF document text
    • http://texmet.pl/userimages/file/5023022233.pdfIn PDF document text
    • https://samsunyapi.com/userfiles/files/77053802373.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-9-17/20210917175550759564.pdfIn PDF document text
    • https://laps.pl/userfiles/file/vewipixufilepar.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16136c527ece82---32229421316.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/1essho2dnqoi3j5oaqi7jscdmb/29236770698.pdfIn PDF document text
    • http://park-seversk.ru/other/js/ckfinder/userfiles/files/82997506553.pdfIn PDF document text
    • https://kildevangen.dk/files/jajobafeloxiti.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b88f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB88F 16496 bytes
SHA-256: 5f072229650d65b651a99b116d4fc257bb38fcef17fc969e473f758fdff79ded
font_01_sfnt_off0000e300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE300 10912 bytes
SHA-256: 46ba4fd63942bd964ce0e274bb147967db01b920eb6750f3858e7a6152adf9a8
font_02_sfnt_off0000fc14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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