Malicious PDF — malware analysis report

Static analysis result for SHA-256 797169bf5a631f47…

MALICIOUS

PDF

60.9 KB Created: 2021-09-17 23:35:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9a14334cf7a6ac90787c086e2a31c067 SHA-1: b98ca48cb0eb686a7eab6cf112c38497b754128e SHA-256: 797169bf5a631f476b66b4a77f37d29095fb26fdc6d8ef540caeae526258c279
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external links, many pointing to compromised WordPress sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, suggesting an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection further confirm its malicious nature, likely as a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6096

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612e9cb9e452a---40407368397.pdf In PDF document text
    • http://mdsalon.ru/img/lib/file/15461046208.pdfIn PDF document text
    • http://stcforanebanglore.smcim.com/www/js/ckfinder/userfiles/files/guzoru.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ad6a815a7cf52ce179378108aa82e34e/kugitojarekirena.pdfIn PDF document text
    • http://studioriggio.it/userfiles/files/38587274041.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/85938212507.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131c77c40c50---90318709314.pdfIn PDF document text
    • https://xn--80apefbdm9ah5g.xn--p1ai/userfiles/46025284700.pdfIn PDF document text
    • http://tabletopad.com/images/file/lizedupakiminezadofodu.pdfIn PDF document text
    • https://rmp-traueranzeigen.de/cms/files/zuzizaxil.pdfIn PDF document text
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/fabazuzonudolovokoxivil.pdfIn PDF document text
    • https://thietbigas.net/media/files/jekeginavidal.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/33288230460.pdfIn PDF document text
    • https://pastravariaizvoarelebratiei.ro/images/file/4754436413.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb8d8df4f2---15151932074.pdfIn PDF document text
    • https://forumhrdbekasi.com/webroot/userfiles/files/61472714566.pdfIn PDF document text
    • http://marinaxaraes.com.br/ckfinder/userfiles/files/duvagarobu.pdfIn PDF document text
    • http://xn--80aafjbaeihgganggf9ajkncugh2a.xn--p1ai/pict/file/votorizi.pdfIn PDF document text
    • http://freetourscadiz.com/ckfinder/userfiles/files/todevafekobajedip.pdfIn PDF document text
    • http://beiks.info/public/file/32725952266.pdfIn PDF document text
    • https://www.prieur-equipement.com/ckfinder/userfiles/files/74051039381.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130df44cf811---90096354726.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614405baa478f---42277897875.pdfIn PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/sugibepu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=how+to+control+another+android+phone+remotelyPDF 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_off0000c9ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9BA 18292 bytes
SHA-256: 8053bfb5476ce1e8e725ad2aea448e225a242d7ed132383d2bb7a1e682dbfdff

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