Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c2d19ebd8c5db4f…

MALICIOUS

PDF

92.8 KB Created: 2021-09-02 17:36:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cef2d945ca46cbe09ea74113752adca4 SHA-1: 2d54d1f3fbed46702c783a422e2c1b705dd1a067 SHA-256: 2c2d19ebd8c5db4fcba30765c997ca990d7aa5751b8648670a6f1e3fb4e47755
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to numerous domains, many of which are hosted on compromised CMS upload storage or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs suggest an attempt to redirect the user to a second-stage payload or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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.
  • 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 http://oodow.cn/upload/file/210618102712756133ao3uxhdmm86c.pdf In PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/39828388788.pdfIn PDF document text
    • http://www.monts.sk/upload_images/file/nijerajipuvatufazolidew.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16073402fae5f6---38792395294.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607daf6c13dc2---36740099573.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/panip.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161179f7fb389a---34896534669.pdfIn PDF document text
    • http://santeh.md/img/files/67429700807.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/a2b30cd09daf464e3364f76ffeed42c0/48010363805.pdfIn PDF document text
    • https://its-bulgaria.bg/files/file/73141878565.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/l8hhb99tj46r7cshfi1n9nuarp/9582290178.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/zodufuguzo.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/b33c90223c58a0cce12fbcfea05c5ff6/betamexujabirilud.pdfIn PDF document text
    • https://volgogradexpo.ru/ckfinder/userfiles/files/pugoj.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/5dt16e33hafnm5kgbh43788ijq/jenama.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/cff10e7bf495829caf974c5f67df2198/ronowefimovaredosereb.pdfIn PDF document text
    • http://koslita.eu/ckfinder/userfiles/files/71415487238.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/19134303766.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160bb638f0917f---pojetimutawofexakoja.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ec7765177---saremol.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a327c2b3db0---29877550358.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/4f3826148f81e4afd7a49ab0f718aabd/luwer.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bacc3d8373---91436776377.pdfIn PDF document text
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/aaor29ecjujvgvg6lh2nnao3g0/jesifozonijafamufubiwure.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=what+are+water+soluble+vitamins+pdfPDF 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_off00010574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10574 17936 bytes
SHA-256: 433de83e3b41b9d9583295a61332d65ead2362d7d5c3012a9e0876fdfbcd893c
font_01_sfnt_off00013417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13417 11148 bytes
SHA-256: 93880eba2e08a60c0af70ed66298cfc1c2898927efb987ad4e37a951ceb36e9c
font_02_sfnt_off00014dc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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