Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e13ba0bffcc37b6…

MALICIOUS

PDF

79.1 KB Created: 2021-06-05 00:13:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 41f374e21526a6ea46115310c8be0637 SHA-1: c62664839dfdf254c698f78e04402dbe4e94950d SHA-256: 3e13ba0bffcc37b6f31e57a916ac3070216f873c66e67bc4a72cdd7066bf8b9e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains numerous links pointing to compromised websites, likely serving as a link farm to distribute the malicious PDF. The document body's obfuscated content and the presence of embedded URLs suggest an attempt to disguise its malicious intent and facilitate the download of further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8836

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://crysiq.ru/uplcv?utm_term=genie+intellicode+remote+setup
    • http://akcjonariusz.com/UserFiles/file/rerufubi.pdf
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b93ab63da---10397122054.pdf
    • https://akproauto.com/nbloom/fckuploads/file/xozuzasinigukib.pdf
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/kdchkn3e16s4tu37pgsm0rfadd/sulenokebepitunulilexozo.pdf
    • http://www.anclupnapoli.it/userfiles/file/79038505542.pdf
    • http://www.aadhar-interior.com/userfiles/file/72877160017.pdf
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ad59a763d3b---59770402369.pdf
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/42c6c6d6493df3661485435ece033d7d/66325243111.pdf
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/d1e7c3dc5509ebaa138dc37107427242/dajane.pdf
    • https://abeess.com/userfiles/file/21311352308.pdf
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096e21b1342f---fegakolenozifuza.pdf
    • http://sbhs1967.com/clients/8/89/8985ce50e7417da620f75e2af787291b/File/joxuvaxi.pdf
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608d42121d9dd---42672120071.pdf
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/688b545d6a5980874822d2a338a71def/81530369310.pdf
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a83eb86af88---xumup.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607c149adc60e---tunet.pdf
    • http://iccj.jp/images/uploads/fckeditor/file/sajowaxanobuzufapo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010a90.bin
a464c5278be9fb1ac95648e4e317d4f0dd69b1625e09d45bd8fa922e814d561c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A90 5040 bytes
font_01_sfnt_off00011ba3.bin
619e2e3cbf393b5484d45716171dee25d6477c0bb429801c314c361cca21bdd5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA3 11392 bytes

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