Malicious PDF — malware analysis report

Static analysis result for SHA-256 b77942c824ce3a35…

MALICIOUS

PDF

69.3 KB Created: 2021-09-20 17:52:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: b42b3ca09b0fb47e21aa53f07369559a SHA-1: f23e973f3ba7940bf0a4aafed2d14e64a896009a SHA-256: b77942c824ce3a35620b1138a5f849468beafdfba0f977bc65293e0911a2f3f4
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external links, including those pointing to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing pages or download further malicious content. The presence of embedded JavaScript suggests an attempt to exploit vulnerabilities or execute malicious code upon opening.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8257

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://ketchas.ru/uplcv?utm_term=y+intercept+of+quadratic+function+calculator PDF link annotation
    • http://www.synagoge-stommeln.de/ckfinder/userfiles/files/jizavafosupozirefikavugug.pdfIn PDF document text
    • http://hoilhpnqbthanh.com/upload/file/48425810364.pdfIn PDF document text
    • http://marcobernini.it/userfiles/files/vagenedulawofegu.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c555a1f7e---84408157462.pdfIn PDF document text
    • http://universalestetic.com/userfiles/file/94574625641.pdfIn PDF document text
    • https://stiglic.sk/userfiles/file/rikogadub.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/90643046955.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/satajikuvufazejero.pdfIn PDF document text
    • http://sibmaxi.ru/userfiles/file/22589232797.pdfIn PDF document text
    • http://eko-uklid.com/files/file/kenuralemipozivam.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16138d2527e8b6---60176611828.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140b0e4bff41---55926737090.pdfIn PDF document text
    • http://machi-tomo.xyz/js/ckfinder/userfiles/files/17935717617.pdfIn PDF document text
    • https://ferado.vn/userfiles/file/42124022751.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/f805f5d8fd05a7af312cb559d4879761/kelakeduwut.pdfIn PDF document text
    • http://www.cemeba.com/uploads/ckfinder/files/tarokebomalolivaxuso.pdfIn PDF document text
    • http://highdesertrent.com/newsite/images/uploads/file/20347431738.pdfIn PDF document text
    • http://kaushalacademy.org/ckfinder/userfiles/files/46976479948.pdfIn PDF document text
    • http://jumpstart.mobi/ckfinder/userfiles/files/sokejegurunumowasuroxi.pdfIn PDF document text
    • https://holcom-solar.com/webroot/img/files/30928446434.pdfIn PDF document text
    • https://tierlistei.ch/downloads/99926125408.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/7cdd94ef4c3b64fd953636505691e97c/bokubisubaxitokaraxipinuv.pdfIn PDF document text
    • http://rulife.ru/ckfinder/userfiles/files/52615850570.pdfIn PDF document text
    • 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_off0000c928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC928 17888 bytes
SHA-256: 46c27c7c7dd3d6193996f983a806c3519ed19bf5b8b8f6a94da07dcbcbe21535
font_01_sfnt_off0000f7bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7BD 10672 bytes
SHA-256: 880fb3c54e66b41862abf9e5c1248de97935e4a02d5115ddfc20d876b9633047

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