Malicious PDF — malware analysis report

Static analysis result for SHA-256 2802afe4c0afc737…

MALICIOUS

PDF

48.0 KB Created: 2021-08-14 14:12:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1257520cc56d300a27bc1d5522b69a98 SHA-1: 6aff430b77fc599a445fe193344be31743105ea3 SHA-256: 2802afe4c0afc737338d2a5ea18f9e1ca5ac24b59db615eb905f5e39cec1d67f
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external links, many of which point to compromised CMS upload directories. The ML classifier also flagged this PDF as malicious. The embedded JavaScript likely facilitates the redirection to these malicious URLs, which are presented as a link farm, potentially for SEO poisoning or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7378

Heuristics 5

  • 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://catamma.ru/uplcv?utm_term=daily+reading+comprehension+grade+1+pdf+free PDF link annotation
    • http://sjar-tech.com/uploadfile/file///2021072503033166.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/70ccf4c1b85efd89378a8604858ca279/kiwitozenejixut.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/nuxebabujaj.pdfIn PDF document text
    • https://joepromenshealth.com/wp-content/plugins/super-forms/uploads/php/files/f0df86eabe9be96a4afae6e583ecf3fd/5437996703.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/f15d0nqbs4feri0gg0jvrikhc6/65224559169.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160750736ab3f8---bililaxupezoxet.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/m5h27vigacb8pfo6ctpigrv8em/44448995226.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16116ee74e7a8a---49797221690.pdfIn PDF document text
    • http://kpnamboodiris.com/userfiles/file/barevuborubaja.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/4097773308.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160984e74dc888---zesanofepedefigu.pdfIn PDF document text
    • http://arslanemlak.com/E/file/67331292702.pdfIn PDF document text
    • http://maezawa-jidousha.com/js/upload/files/62046882175.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/9915c9729e9358d577464ee846496cae/lozosowulu.pdfIn PDF document text
    • http://gld-lining.com/user_img/files/41729649436.pdfIn PDF document text
    • https://rdsdealers.com/ckfinder/userfiles/files/66007759765.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/095becc45592a813b67627448c1e005f/94291165865.pdfIn PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/tuzolomiboleneleboxizu.pdfIn PDF document text
    • http://nollve.com/img/editor/image/file/76086727919.pdfIn PDF document text
    • https://chupwo.com/editor_upload/file/12831053664.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160878b7f6ef13---jibeza.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/gifujiladugo.pdfIn PDF document text
    • http://www.tsahimmongol.com/uploads/images/files/zewukulusawotorofurik.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/4f9466b35a2fd3456ec43a267a52ead6/sosufumuxebipoxugi.pdfIn PDF document text
    • http://ranaghatpchsschool.org/userfiles/file/60978449547.pdfIn PDF document text

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