Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccd031be4c380bfd…

MALICIOUS

PDF

70.6 KB Created: 2021-09-02 06:53:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f6223a9fb182041c31e6a478c4c11e94 SHA-1: 183466e176c6ae3c6cf0410b59d93a71ce1d66e5 SHA-256: ccd031be4c380bfdda97c267381b556b5d5cd399dac49f94fd2982c1cee04936
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to obscure the final destination and evade detection. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely to phish credentials or deliver a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • 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
  • 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 http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f26eea80b67---pazetofuma.pdf In PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/i7slia0270nbmvl3khom6fu3k4/jofukovipoxatizixisin.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/jfu9nspuot49sahggi3hpm5a0g/78113935398.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a31826f4095---kasegubizu.pdfIn PDF document text
    • http://ventiliatoriai.lt/js/ckfinder/userfiles/files/famowul.pdfIn PDF document text
    • http://taiwanglassgroup.cn/userfiles/file/35782821989.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/08115284539bdaa59e7e74a15813fdd7/sigegetegeda.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/3541dea37897f08c34d436d38c0d09a5/sonowajoxadegipizererur.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160adad860dce2---18666534957.pdfIn PDF document text
    • http://knuhpharm.kr/userfiles/file/20210618214218.pdfIn PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/pagibop.pdfIn PDF document text
    • https://treasurehunterdetectors.solar-ovens.net/ckfinder/userfiles/files/mufikirote.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/11140432360.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c40ce73e2---57280578917.pdfIn PDF document text
    • http://polyacer-ecp.com/userfiles/files/20210720_214207.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/656159ca74f3cf62ab56f56ecd23e6e7/89001454805.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160784e1560d41---legugido.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/dvr6jkoho2jfmlknrse6740k2v/87729632783.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b998294b7cf---xivufor.pdfIn PDF document text
    • http://yuqiaohome.com/uploads/files/202108210344596763.pdfIn PDF document text
    • http://rosswellbulldogs.com/clients/b/be/bee1e50a814ad4ba40998340b8964064/File/xebuloxonogewo.pdfIn PDF document text
    • http://infunplastic.com/d/files/xaxejitajurija.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611b91827fc59---24183618230.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=grilled+corn+and+feta+saladPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b756.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB756 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF68 14680 bytes
SHA-256: 5e4e6d05fd5db9eacda43a86ce9f0f2c4e6904ec50960ea31c9ed21bf6e4c37a
font_02_sfnt_off0000f436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF436 10508 bytes
SHA-256: 6cf1c61e913366429ad24f74aba8d43e31dbf55e31488f26951a1bd98b929223

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