Malicious PDF — malware analysis report

Static analysis result for SHA-256 31b3a051fca43fae…

MALICIOUS

PDF

70.2 KB Created: 2021-09-06 21:04:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e863efd537d75d0a56a78a1da676436f SHA-1: 2c417e52aca35310d0080e215e8a3a3bf51127d4 SHA-256: 31b3a051fca43faeb51c4e14b588f26acf3d09c230abefc8a887734b8b4073e4
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous links to external websites, many of which appear to be hosted on compromised CMS uploads, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and the overall structure point towards an attempt to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9130

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=time+management+course+outline+pdf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160b038c797fd6---subenuwuwapitofom.pdf
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f101480f6---godukoxoxekupanoja.pdf
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/8de9cc528387343ec0e1db21cd2179d1/27945858760.pdf
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ff6852b6b5f---68112301690.pdf
    • http://fatfailogistics.com/fckeditor/files/file/netidozudusevabetirimegor.pdf
    • http://greddy.com/admin/common/ckfinder/userfiles/File/lirazakelapiv.pdf
    • https://www.pactforfamilies.org/ckfinder/userfiles/files/torizetogilifepurin.pdf
    • http://cmcthailand.com/ckfinder/userfiles/files/gosetizu.pdf
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/28de2af61ccd87902a4b5c69bc38f8cc/tasupoxikukitenotu.pdf
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612db962af369---17782937278.pdf
    • http://rfinshaat.az/userfiles/file/notokezaguzaradir.pdf
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb2ca5ab47---murunoxakitulu.pdf
    • https://clubon.top/uploads/files/9295870696.pdf
    • http://greenworx.eu/images/uploads/files/60282100757.pdf
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/16070dccec24db---tozizulifa.pdf
    • https://ipic.vn/userfiles/file/kupodevasezupi.pdf
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/b7fd12cd07770026afe6a23cea79386d/zejivisumadoberaj.pdf
    • http://usmleworkout.com/files/file/jixopopasipokegigavi.pdf
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/763da75af68cdf3beb5f0ab81960496a/zutedipuvasoka.pdf
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9902a632c4---2917476579.pdf
    • http://jjmcp.jp/userfiles/Image/file/51073127792.pdf
    • http://irs-messtechnik.at/upload/79059206211.pdf
    • http://nessium.net/userfiles/file/10897881448.pdf
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c492c08aa6b---87015113890.pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df6a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF6A 16792 bytes

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