Malicious PDF — malware analysis report

Static analysis result for SHA-256 37ea15a2ffa7e49e…

MALICIOUS

PDF

85.3 KB Created: 2021-06-28 17:17:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c7908ef65e9d7138e7b46b721222d34d SHA-1: 590aa2421a718e9cca22df39cba186d366ab9635 SHA-256: 37ea15a2ffa7e49e49dded7188a0973912cfd794ddad358991853e6595b0a4ef
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute further malicious content or phish for credentials. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/0e2e0189bda3abd97e402b56cbe39c0c/15682239769.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a555765f4ca---sasugoziguf.pdf
    • http://detaycopymatbaa.com/userfiles/file/gufiruliguwomuzefate.pdf
    • http://ash-graphy.com/userfiles/file/19998013409.pdf
    • http://school19-zav.ru/userfiles/file/83664855341.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609410d2b1000---26932623149.pdf
    • http://jjmcp.jp/userfiles/Image/file/gazadizasegelavimatamiku.pdf
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/63372072616.pdf
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/ffer52c5vjdb9uns9bkpoh5md4/14068764937.pdf
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/728caffbb4d2d11f085f67ad3791c4b6/49467651176.pdf
    • http://guides2alpes.fr/uploads/file/kobatepadidupenedibolij.pdf
    • https://nenanhduong.vn/Upload/files/sarikowol.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff51613f0b---xigodovubugugukodirajat.pdf
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072948314946---53943477483.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/sjdn1lhlusa0g3i29850llhg6f/jomarotovulukozinediwo.pdf
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/af1277c53136a2354029cc6c7a7102f4/37723516754.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/82445e6d17e2af6b07e19217073b208f/71957938201.pdf
    • http://svazekobciorlice.cz/userfiles/file/36578377464.pdf
    • https://isleo.com/i_photos/file/detafasavuwari.pdf
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/cd71caa788cb35bcdc78446ac8a7930c/99677102427.pdf
    • http://thuaphatlailongthanh.com/upload/contentFile/minhchau/file/telidavozizupogajimufeso.pdf
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/ut3gsrap1l9bhfpf4uv4nl0s23/viluv.pdf
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079fc22b6a5b---38645603558.pdf
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/ploainidblkvhfm2gsckpj7psf/famizibefij.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/14e0d39d04216ae8dfe9f83120de5c1a/23755267665.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=yellow+lines+on+pavement
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed4d.bin
db1528f831aa229f4674ef52a6e29861acc775d733c38969e6ec08d503e1a3ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED4D 10448 bytes
font_01_sfnt_off0001050f.bin
8ce19fddd265e896fbf6f76ef1b55351ccc1b2478b0805cf8473325d09a87067		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1050F 16760 bytes
font_02_sfnt_off0001301c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1301C 16792 bytes

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