Malicious PDF — malware analysis report

Static analysis result for SHA-256 807302b9cca8d36a…

MALICIOUS

PDF

71.8 KB Created: 2021-09-28 05:38:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 201e800f2f438fa5aac9b49ff5b119b2 SHA-1: 6c4c3938401527a08abf2bddd9ae5624ac499e82 SHA-256: 807302b9cca8d36a5eb2a6aecf5f014f1c4f0ebbbc2f1f7c43611547580323db
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm or phishing attempt. The ML classifier strongly flagged this PDF as malicious. The embedded JavaScript is likely used to facilitate redirection or further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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://nomylo.ru/uplcv?utm_term=android+ios+cross+platform+games PDF link annotation
    • http://musorcentrum.hu/files/article/file/gupudotabudevebukam.pdfIn PDF document text
    • http://textingrights.com/userfiles/files/gufenunavatuderer.pdfIn PDF document text
    • http://nanoscopy.ru/uploads/files/kotujixapidofe.pdfIn PDF document text
    • https://www.psk.com.au/application/third_party/ckfinder/userfiles/files/6921122929.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/80203333336.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/tinumok.pdfIn PDF document text
    • https://narellesastro.com/userfiles/files/varibelunokitumug.pdfIn PDF document text
    • https://inprovitbrasil.com/ckfinder/userfiles/files/nuvakisirupekebenowij.pdfIn PDF document text
    • https://suksesunited.com/contents/files/raruzabipelufamifufadop.pdfIn PDF document text
    • http://lawyergz.net/uploadfile/files/faxuveza.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/seniva.pdfIn PDF document text
    • https://anninhsieuthi.online/upload/files/50004122304.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/kaxazotezulamojitusamimov.pdfIn PDF document text
    • http://secohthailand.com/file_media/file_image/file/wuzamejikes.pdfIn PDF document text
    • http://foto-klub.dk/userfiles/file/33324457423.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/c665173213f91b1dbd7685c3b8a7e168/puluremepozabepuxoratub.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/9407bc385739d107b4d590a483956ea0/kagoguzire.pdfIn PDF document text
    • http://dasbluemchen.com/woxavisotamigidowife.pdfIn PDF document text
    • https://ratosatu.com/contents/files/78670233970.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b8666433e8---xupuweki.pdfIn PDF document text
    • http://48bulls.com/js/upload/files/6093551467.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/l690drvtcj0slkvbu6k779e990/joxubujuzebanetom.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614fb6abb7162---tewus.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136c63ccd32d---muzumumepakonopakoge.pdfIn PDF document text
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b40c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB40C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC1E 17356 bytes
SHA-256: 7d52ca521bc7793cf6ba76725f0be69ae90c31febae18e2fc391f4d089808997
font_02_sfnt_off0000f88b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88B 10944 bytes
SHA-256: fef1cc43c8e4e20921fff692bb4ce2cc4f5516eff8c045d89d89b44f87334c43

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