Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b775f04a5af16a0…

MALICIOUS

PDF

73.4 KB Created: 2021-09-19 14:11:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ab71604e7722f0cd298dce8a40cf5d6b SHA-1: b60e11364f49d0e096a21cfce36db0c013b1047b SHA-256: 4b775f04a5af16a064d24f13a0873d243e243e29fded1a5db8fc878665f335f3
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm. The embedded JavaScript is likely used to facilitate the redirection or further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5901

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://www.pollackmihalyiskola.hu/ckfinder/userfiles/files/vejiwedem.pdf
    • http://bindashnews.com/userfiles/file/89637511577.pdf
    • http://mnarch.it/userfiles/files/68774344230.pdf
    • http://d2dgroup.net/upload/files/jozasubela.pdf
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/73915203295.pdf
    • https://dichvuketoanvn.org/uploads/files/vezonurulebodunabuzixev.pdf
    • http://nationalherbo.com/userfiles/file/kojuvenoxiguwi.pdf
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/wofanuzovewabamenugedal.pdf
    • http://jmvlpslimited.com/ci/userfiles/files/puwibukawaxevizolamisoxuj.pdf
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/16132b02fe984c---zomisaza.pdf
    • http://sprinter-lab.ru/content/File/40576038792.pdf
    • http://amy-tsai.com/images_express/userfiles/files/40338446441.pdf
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9c3af2789---monusanaradifagelulam.pdf
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5098a4a90---saremebapifa.pdf
    • http://clingac.com/d/files/92288268908.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/27eb10d92c8dd76f8b4a0cb2e57f1385/22188954379.pdf
    • https://dukupahit.com/contents/files/vamogijodebonewij.pdf
    • http://cegled.varosom.hu/userfiles/files/revejinesugenokute.pdf
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16131f68bc4c0a---29172021438.pdf
    • http://ariogalospspc.lt/userfiles/file/2340924990.pdf
    • http://ozanatalan.com/iboard/includes/userfiles/files/gejuna.pdf
    • http://investbuild.ru/var/upload/file/kafigatutak.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=1337x+torrent+proxy
    • 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_off0000d02a.bin
7b9312db8ad228dd3596527cf0a5887d4325915364aa9e952caf095071a373a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD02A 17524 bytes
font_01_sfnt_off0000fdc9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC9 16792 bytes

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