Malicious PDF — malware analysis report

Static analysis result for SHA-256 c983406114be686a…

MALICIOUS

PDF

83.1 KB Created: 2021-09-24 11:23:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a278d0bc8cbb6bb3b5c8ae7e9e3187c7 SHA-1: d2d07f5795fa816d7bc16deaeadfb93555ce12be SHA-256: c983406114be686a95b734e7204477fdcb6a7e2befa3e04835c8898e9d75f1d3
132 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 point to compromised WordPress sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a non-clustered link farm on disposable hosting, suggesting an attempt to lure users to malicious content. The embedded JavaScript likely facilitates the redirection or further exploitation.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4599

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://philabc.ru/uplcv?utm_term=hamraj+old+song PDF link annotation
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/f588fa70f087dfa00bbceebcdfa3bc9d/nasabokuzodabixe.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/kerijisajuvowuf.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/metexezavovaf.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/7480201505.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/l1ecua7niqb0v5tggvmjqtbmkd/26123485294.pdfIn PDF document text
    • https://itandem.net/ckfinder/userfiles/files/9121846148.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ec31ca501---dudijogotoruwixusa.pdfIn PDF document text
    • https://sausalito.com/wysiwygfiles/file/lapetirasibaremor.pdfIn PDF document text
    • http://runnersavezzano.it/public/userfiles/file/28504118932.pdfIn PDF document text
    • http://sh-songshi.com/admin/upimg/file///89648322172.pdfIn PDF document text
    • http://ryukatsu.com/userData/board/file/matolipoxeranovodeb.pdfIn PDF document text
    • http://sushi-belovo.ru/files/nojusasavawarik.pdfIn PDF document text
    • http://esangsok.com/upfile/files/94463418434.pdfIn PDF document text
    • http://skyrun-arser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210903153210692040nbby5m.pdfIn PDF document text
    • http://aiaato.com/FileData/ckfinder/files/20210917_31CDD9E367CA51A0.pdfIn PDF document text
    • http://aokisuper.com/ckfinder/userfiles/files/kujojelidumub.pdfIn PDF document text
    • https://sindicav.com.br/ckeditor/ckfinder/userfiles/files/19457723516.pdfIn PDF document text
    • http://tienhasteel.com/app/webroot/upload/files/defutivaxat.pdfIn PDF document text
    • http://productinfo.in/konadnew/userfiles/file/bizefovosipotuninedegefo.pdfIn PDF document text
    • https://butagallery.com/userfiles/files/nijini.pdfIn PDF document text
    • https://maydangson.com/vietkiendo/upload/file/32877106674.pdfIn PDF document text
    • http://pandoraecza.com/genelresimler/file/kijigonufikebinetogetofij.pdfIn PDF document text
    • http://cisseo.net/userfiles/files/96370287663.pdfIn PDF document text
    • https://expomediainc.com/upload/file/dujuxulupuwadaz.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_off00010648.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10648 10388 bytes
SHA-256: fd8138309abeb1d35eea05e6243cdaeeb111acffb763bfa68fe66df42f345693
font_01_sfnt_off00011d6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D6B 18476 bytes
SHA-256: ddf59fd1cc756de8e9058819ff1bf1d6817f4bf8cb70914e85fcffe00e8ffa60

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