Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1e9b7765556d13e…

MALICIOUS

PDF

75.6 KB Created: 2021-09-16 05:51:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f4f3ac23b75d9f8f91321de3286a742b SHA-1: 21ca1bf5444ab89a804ebbf2e8afe2feea1679ef SHA-256: e1e9b7765556d13eeb1bba7c1967fe750f0140f8dd6c4342fe3d429ef9f31bbc
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. The heuristics reveal it contains embedded JavaScript and functions as a link farm, directing users to compromised websites and potentially disposable hosting. The embedded JavaScript likely facilitates the redirection or further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8530

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 https://pixomot.ru/uplcv?utm_term=convert+pdf+to+excel+programmatically
    • http://thaicockstar.com/ckfinder/userfiles/files/78898651091.pdf
    • https://thucphamtruongxanh.com/Upload/files/28240606524.pdf
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/2b9b3c73e06c746079db6e09d87af54c/lefep.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135b633a8d13---20648468408.pdf
    • http://corising.info/sa_upload/userfiles/file/20210904014628.pdf
    • http://rebeccaosborne.com/uploads/39072277188.pdf
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/7940493af0807186f8273083b725f07b/33440038032.pdf
    • http://les-dvorik.ru/userfiles/file/fugazazijimonapuperef.pdf
    • http://savitapiti.org/ckfinder/userfiles/files/71405579766.pdf
    • http://www.annaleehuber.com/content_files/file/44762824524.pdf
    • http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/61225464683.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/161387a188a74e---vefajipi.pdf
    • http://prmakeup.com/Image/files/wevazi.pdf
    • https://vresponse.net/userfiles/file/9544953223.pdf
    • http://ammk.sk/userfiles/file/8374805692.pdf
    • https://vaynhanh365.net/contents/files/48789011311.pdf
    • http://zxpgw.com/userfiles/file/97163721607.pdf
    • https://jackinthegym.com/uploads/files/202109071614576695.pdf
    • https://kingdom.vn/userfiles/file/bapok.pdf
    • https://moraure.net/js/ckfinder/userfiles/files/89096860174.pdf
    • http://jandenzobv.com/image_uploads/file/43006571298.pdf
    • http://wamaeassociates.com/images/uploads/originals/file/tugivuratafubikepuzadu.pdf
    • 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_off0000d461.bin
da1d111cf47aeeba8274ab5a81ac8e77a042743111861cb925d450071cd1f78b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD461 18444 bytes
font_01_sfnt_off0001042c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1042C 16792 bytes

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