Malicious PDF — malware analysis report

Static analysis result for SHA-256 683c686b1cf86aed…

MALICIOUS

PDF

98.1 KB Created: 2021-07-22 07:16:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 3c22e84cd88c5072bb52fcb80a0e884c SHA-1: 4aedd65a14394d4ccfcdae3de1fdde6359966dbc SHA-256: 683c686b1cf86aed884af6de890d9cc1a467db24bf4c74ab830854b80697b86d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm for SEO manipulation or phishing. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript is likely used to facilitate redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

Heuristics 7

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://benqmusicworkshop.com/fupload/file/xijegatiniwudewanenaworo.pdf In PDF document text
    • http://ruben.pl/ckfinder/userfiles/files/31178611468.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c1cb48c7d51---20179720320.pdfIn PDF document text
    • https://ural-aiti.ru/admin/ckfinder/userfiles/files/fadofageta.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/26382878827.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f79e335e6a6---bibuwuweb.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a830ca1153d---widunixis.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/6du2kknhq73bfi25hjvvffpmsh/tuzixavoket.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/90732288819.pdfIn PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/winovibevepoj.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/237d9bb978183dd89207b12dec62a67a/82522063283.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/rajimukifefebeniropavib.pdfIn PDF document text
    • http://duonglaohanoi.com/userfiles/file/70636387252.pdfIn PDF document text
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/rfijg9vd7tkcjvr7tm1vh4jh62/95562101160.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/69aj2g7enpko705io739r9fgf5/nogun.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/gciucjuuvm0ved91qb46an67c8/92877845906.pdfIn PDF document text
    • https://space1500.com/wp-content/plugins/super-forms/uploads/php/files/6c5ece87b0aeeb87b5e27bc47204942a/70343996819.pdfIn PDF document text
    • http://eva.am/files/fed4da587560eaac.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa2556cab5f---44515763709.pdfIn PDF document text
    • http://solyaris.pro/admin/ckfinder/userfiles/files/29363518286.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/b178739efadeac533f7dc334c67215a6/sotojaxowokavox.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/2a5d77082e755cb074c58132de87d9f6/90792557350.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=the+meaning+of+successorPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001036c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1036C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011b83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B83 10704 bytes
SHA-256: f174aa26f4f023a410cfe7314e4848d77b662e8ecacccab4d6fb05337237b1c5
font_02_sfnt_off000133db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133DB 23920 bytes
SHA-256: ae4212ac83f3b81a5aaca144d472c03026d26aa648a7090bd338520a1e2ea0ec
font_03_sfnt_off00016f06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F06 2240 bytes
SHA-256: 5e85da4302f249c06b43154a7e3522fb8dfa1bfb2e388a38b7c6f536e1ba00ca

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