Malicious PDF — malware analysis report

Static analysis result for SHA-256 becf28f73a395138…

MALICIOUS

PDF

81.4 KB Created: 2021-10-17 23:46:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 6bdc34c7495724f30822b98254ff4122 SHA-1: 84f0408a7e34a2ac5a7323ac8bb04031cd257558 SHA-256: becf28f73a395138d404589344fa8c1648807bcbd61fc25897f1232d18cda9a9
104 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, indicating a link farm or redirection scheme. The ML classifier strongly suggests malicious intent, likely to direct users to malicious content or phishing sites. The presence of embedded JavaScript suggests it may be used to further obfuscate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://servicenter.ro/ckfinder/userfiles/files/61478373226.pdf In PDF document text
    • https://aucordechasse.fr/vosImages/xivibajuwubirad.pdfIn PDF document text
    • https://webaruhaz.codefon.hu/js/ckfinder/userfiles/files/retog.pdfIn PDF document text
    • https://successalpha.team/upload/files/kujifogasoludonimigegugop.pdfIn PDF document text
    • http://halaljones.com/uploads/files/kegezugo.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/karopegoxano.pdfIn PDF document text
    • http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/41304837390.pdfIn PDF document text
    • https://onecre.com/images/content/files/govilazojitel.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/6133450652.pdfIn PDF document text
    • http://batterseataxi.com/survey/userfiles/files/85336642641.pdfIn PDF document text
    • https://radio-clipa.ro/userfiles/file/jivejezufoxi.pdfIn PDF document text
    • http://yao-cheng.com/uploadfiles/20210929033051.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/89803719150.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/vuvopedoj.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/2815a7efb361825eed62f257132987c8/gevus.pdfIn PDF document text
    • https://eminentland.com/admin/userfiles/files/90289345017.pdfIn PDF document text
    • http://thai-apsproducts.com/file_media/file_image/file/pototonufetomapewugubawi.pdfIn PDF document text
    • https://univerosg.com/ckfinder/userfiles/files/53607110663.pdfIn PDF document text
    • http://iucecb.com/files/file/91392191840.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/so1jplq8mmvfu50easv9lp5kps/78691982710.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/34c61fdb3f54680ef3271e4c2f5a967d/soguxuginiridigaliv.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614964690364d---96883403771.pdfIn PDF document text
    • http://eco-versute.com/app/webroot/ckfinder/userfiles/files/xevagifedemenubata.pdfIn PDF document text
    • http://ecofincas.net/ckfinder/userfiles/files/30168962482.pdfIn PDF document text
    • https://arerp.kr/data/file///wuniviredogogamil.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/RC0zOYPQW8A/uplcv?utm_term=soy+milk+bad+for+malesPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f382.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF382 10736 bytes
SHA-256: a00680478f19d5cb722b531ed195b88b94e5c838f8aa1468ab61b853083beb7f
font_02_sfnt_off00010c26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C26 17104 bytes
SHA-256: 466f97136733ae413181ec22c1c37e9d7b3c93aca293da6ec37c213ac08b8b9e

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