Malicious PDF — malware analysis report

Static analysis result for SHA-256 aee9009ae6773d41…

MALICIOUS

PDF

62.3 KB Created: 2021-09-05 21:54:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8aee25077ec9bd2934e900785f067b41 SHA-1: 0f840bc83cb1c5a721b261077f98d8b15194f96f SHA-256: aee9009ae6773d41635978fc874abb8e37df9695d0ca3e509d34510e9993a1d5
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting. These links appear to be part of a link farm designed to manipulate search engine results or redirect users to malicious content. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7649

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://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607899dd5f590---laxudubus.pdf
    • http://locke-3c.tw/uploads/files/202108200926473028.pdf
    • https://bloomeng.com/uploads/tisewidudo.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160908de5e7f93---tewebimijunuguseseg.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16072600eb0e58---44125742376.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076249aaf953---rufopatigagivun.pdf
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161341aa786cec---95236666237.pdf
    • http://zkojicin.cz/userfiles/file/35644680259.pdf
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160bb8328c970c---xowimuzi.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160dc3cbb53326---69940651138.pdf
    • http://ya-ke.cn/admin/upload/18124273863.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607582d243bee---tavutabivafoxabudako.pdf
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16094dd7e05b1b---vetokiwe.pdf
    • http://dokumsuzgec.com/userfiles/files/640703042.pdf
    • https://brigitte-farner.ch/userfiles/files/88800503119.pdf
    • http://quimis.net/js/ckfinder/userfiles/files/26517592565.pdf
    • https://mytopics.it/uploads/file/99627285807.pdf
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc52a54ffad---rogeritusunudubedas.pdf
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c85724db040---55680021936.pdf
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/c9b1c2dd73b4ba59800e3c90181b0c90/11792509171.pdf
    • http://hoanhaochemical.com/uploads/files/legagumujejufabak.pdf
    • https://sjamsul-hidajat.id/ck_uploads/uploads/files/85979778965.pdf
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/e188991c5324c905a7d4e82fef486e34/fewikenojofedonenavopuk.pdf
    • http://gesht.ru/admin/ckfinder/userfiles/files/wulapeduxosarugafiwazar.pdf
    • https://stopserv.ru/files/file/87403413153.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=plant+and+animal+cell+coloring+worksheet+answers
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bd29.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBD29 16792 bytes
font_01_sfnt_off0000d53b.bin
46cfa59e8f155ea6925583fc0331af957787110565810e2426f7803f0695169b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD53B 16556 bytes

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