Malicious PDF — malware analysis report

Static analysis result for SHA-256 b377cbe28a407068…

MALICIOUS

PDF

64.0 KB Created: 2021-09-23 14:59:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 6bd3e15d897c2e5485a6dc022281b003 SHA-1: 5a9296ed71d78edaf629a18c33db5802548515d5 SHA-256: b377cbe28a407068ee7f2e52213552ee86bcc6a0dd188ac750fe472b606778e7
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The critical ClamAV detection and the presence of embedded JavaScript indicate malicious intent. The PDF contains a link farm pointing to multiple distinct hosts, many of which are compromised WordPress uploads, suggesting an attempt to obscure the final destination and evade detection. The embedded JavaScript likely facilitates the redirection to these external URLs.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4625

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.
  • 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://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1613d119740e32---lixuzize.pdf In PDF document text
    • http://cjcounsel.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/54296251975.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/88794970707.pdfIn PDF document text
    • https://adikkeempat.com/contents/files/pufajisikinajus.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/nubofezod.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/79519143342.pdfIn PDF document text
    • https://minlinart.com/archive/upload/files/26734590932.pdfIn PDF document text
    • http://levne-pohary.cz/UserFiles/File/73367571642.pdfIn PDF document text
    • http://grafitym.kz/files/file/fipokujositibu.pdfIn PDF document text
    • https://kuni.ro/app/webroot/files/userfiles/files/61547366132.pdfIn PDF document text
    • http://nedvizhimost-v-sharm-el-sheikhe.ru/uploads/files/kigonabulegoxekesiwuzasef.pdfIn PDF document text
    • http://tdsns.ru/userfiles/file/legifinipozizodeterosagif.pdfIn PDF document text
    • http://escrima-rlp.de/userfiles/file/podin.pdfIn PDF document text
    • http://watch62.ru/files/files/84226810886.pdfIn PDF document text
    • https://calienglish.com/ckfinder/images_store/files/91269649798.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/3613c76fa561bf05dc68d75041d97157/72029449675.pdfIn PDF document text
    • http://blow-w124.com/js/upload/files/95054528386.pdfIn PDF document text
    • https://bulgariapools.com/contents/files/37426187102.pdfIn PDF document text
    • https://proetcontra.hu/userfiles/file/gixezikubi.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1613030b47053d---66119711078.pdfIn PDF document text
    • https://newsru.md/upload/userfiles/files/1012905350.pdfIn PDF document text
    • https://juvelyrikoscentras.lt/Files/file/41413913854.pdfIn PDF document text
    • https://f2h63c2.ip4secure.net/upload/files/zalinixewiveravokevu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+connect+android+phone+to+windows+7PDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c8e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8E0 10692 bytes
SHA-256: 8c8f8bb53e9d3839769944546b9640a62156fe1a205b057de375fb1253c978ec
font_01_sfnt_off0000e165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE165 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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