Malicious PDF — malware analysis report

Static analysis result for SHA-256 a39ea4d910f436be…

MALICIOUS

PDF

65.1 KB Created: 2021-09-20 17:14:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f9c6355e7f13670042801f26141ef757 SHA-1: 3ec67d35d13d4eb68196f277465de0b65506486b SHA-256: a39ea4d910f436be62fa579791c95969f874ad8d5bbf651fa18d642628fc1994
154 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, distributing numerous links to external websites, some of which are hosted on compromised content management systems. The primary purpose appears to be directing users to potentially malicious or deceptive content through a network of distributed URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7082

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://www.huaikrachaohospital.go.th/assets/global/lib/ckfinder/userfiles/files/1343944295.pdf
    • http://harchovyk.com/userfiles/file/70830226759.pdf
    • http://dxczx.com/ckfinder/userfiles/files/20210902_123600.pdf
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/56232a66cb0c406d526025fd047ca76b/dezom.pdf
    • http://abwcoliseum.com/uploads/files/tixusejerotuluwojagu.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbdc78ca61---pepafisajizubam.pdf
    • http://xhiehchin.com/Xhieh_News/_file/zovulotapowibokevulel.pdf
    • https://bulgariapools.com/contents/files/nilewulakat.pdf
    • http://888spirits.com/userfiles/file/63022674380.pdf
    • http://dafangtour.com/fckeditor/userimages/file/mamupowujumexox.pdf
    • https://nissanzorba.ro/ckeditor/ckfinder/userfiles/files/55872721795.pdf
    • http://premiumcsp.com/uploads/files/14815978008.pdf
    • http://www.propper-droppers.nl/files/file/13969367176.pdf
    • http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/zufotavevejabotituz.pdf
    • https://aksusu.com/upload/files/85593684611.pdf
    • http://pospatrans.cz/UserFiles/File/tamavegomepetorivid.pdf
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/eb3eddabe18c927a7263d564f8dc5ff4/83586882161.pdf
    • http://th-hl.com///upload/files/49255526466.pdf
    • http://goodtraefarm.com/ckupload/files/86415747159.pdf
    • http://www.mezmat.ru/ckfinder/userfiles/files/bapujekoroxalate.pdf
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/822d9706e9ff800a756794a1859855d5/xexibukaravidowigebafejax.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1612f262aae49d---91326882752.pdf
    • http://starma.pl/files/file/7196699845.pdf
    • http://shimamura-mail-order.com/userfiles/file/nenafugug.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=best+mobile+offline+rpg+games
    • 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_off0000e5b6.bin
a06905c903447112f52150a4c0e546dfe305afb5f594a75e6d05c3a3d76404ff		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B6 10892 bytes

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