Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3f6a72f7b863f93…

MALICIOUS

PDF

63.7 KB Created: 2021-05-22 20:03:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 933fd6f68e0f58c73a0a2bc3f110afdb SHA-1: 0732c097004effd2a8cb29406ce948c5be5ab9ef SHA-256: c3f6a72f7b863f937dc7f9c4f0b45c843b17cb7793e37386db4ddb0d7896b8d5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The embedded content, though heavily obfuscated, appears to be related to software downloads, reinforcing the phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 5

  • 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.
  • 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://archism.ru/uplcv?utm_term=candy+crush+soda+saga+mod+apk+with+unlimited+lives+boosters+and+moves
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/emmhpgnna2ff84pdut93hapqca/38752565503.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2e299dc4c---76436074075.pdf
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/16090b5c4524a8---80305653519.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/e5b8a23306dae333142f403cb01ac899/4251831500.pdf
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/hdfracok43j8joeiv0mf3421rm/matomaferijobuwamivuz.pdf
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091b76809bb7---73264038389.pdf
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16070c4b3a63e5---96837385508.pdf
    • http://akicgiyim.com/userfiles/file/92057913154.pdf
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9b6e1dbf0---108994630.pdf
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/8b55eb32cc848c48b441c3c3bc090b5b/salufepuve.pdf
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f6e9ea8a0---vegolises.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b61804bfff---90703264848.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c33238c64a---12017844784.pdf
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/a59043f30832731f12c2304dd9591b9d/nilubominoj.pdf
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/7f8c54f82b5cd9e17f9beffdff08148b/39862492002.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/8a19a28e7359270f1c5a865828d2fa11/xamarajozuredubofexosir.pdf
    • http://kasargod.net/uploads/file/30324382077.pdf
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160761e5e91c28---27863669942.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d870.bin
55cba5d7fb0a049341c430a3e2360b6e47ac247ed7ba806600896b28dd181da0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD870 5852 bytes

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