Malicious PDF — malware analysis report

Static analysis result for SHA-256 1df3f23fa2f65263…

MALICIOUS

PDF

76.2 KB Created: 2021-09-19 04:14:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a2d4c47f9759f5399f0bd5bde7274874 SHA-1: cb6eb0c99adaa133954513ba23c04b7c149da9be SHA-256: 1df3f23fa2f652631bf267bdd2948ab32d453c06d2d741865ac525d899b61373
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are hosted on compromised CMS upload directories or disposable domains. This suggests the document is designed to redirect users to malicious content or phishing sites. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6688

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 http://chingyi.tw/userfiles/files/23300287998.pdf In PDF document text
    • http://bilafafafa.com/shopadmin/upload/files/67364947099.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109091021243706.pdfIn PDF document text
    • https://konteshamamotu.com/userfiles/file/35949248639.pdfIn PDF document text
    • https://ferest.ro/imagini_ws/piridil.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/kuxuzobiguzonipapovobiv.pdfIn PDF document text
    • http://abwninemile.com/uploads/files/momowige.pdfIn PDF document text
    • https://nazragame.com/calisma2/files/uploads/36562944474.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613905df9c4d3---rofutepesazajime.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613e365299005---20714571919.pdfIn PDF document text
    • https://ltes.tw-goods.com/UserFiles/files/59163810716.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613037bdb1a2f---walumifimilinedate.pdfIn PDF document text
    • https://fotoprint.lv/downloads/file/fubanejomunuzuzigobo.pdfIn PDF document text
    • http://enidental.com/userfiles/file/20210905152558.pdfIn PDF document text
    • http://meghdoothsuzuki.com/uploads/satubulejupaf.pdfIn PDF document text
    • https://5a.ro/ckfinder/userfiles/files/61699529813.pdfIn PDF document text
    • http://antoniolescio.net/userfiles/files/dokaliwa.pdfIn PDF document text
    • https://bankkartya.hu/js/ckfinder/userfiles/files/kudiwifop.pdfIn PDF document text
    • https://suativisamsungtaihanoi.net/upload/files/menokekododofiz.pdfIn PDF document text
    • https://tamphuctriland.vn/upload/files/xifamozaz.pdfIn PDF document text
    • http://eotp.info/sites/default/files/fck/file/11654166928.pdfIn PDF document text
    • https://www.hotel-restaurant-plainfaing.fr/ckfinder/userfiles/files/jorixoma.pdfIn PDF document text
    • http://silver.jo/ckfinder/blanc/files/munerugazanipifima.pdfIn PDF document text
    • https://anfauglir.com/images/file/59579269213.pdfIn PDF document text
    • http://yesfabric.com/images/upload/File/36614215472.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=pdf+maths+class+10PDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED0B 18740 bytes
SHA-256: aa89935404eedeb52693536c2e1c186ac0b28ee53d326d4f4d217287bfb56895

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