Malicious PDF — malware analysis report

Static analysis result for SHA-256 61c88678bab3be2e…

MALICIOUS

PDF

85.0 KB Created: 2021-09-14 08:31:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f317e20f5a9d6f330cd5a01260ef1126 SHA-1: 5067d108a082f3eee6f66822bd68140d0a7f1109 SHA-256: 61c88678bab3be2e2076f8f94e4d1ef2b9b92b64b362b021d9273e5a61a05ace
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading a secondary payload via the provided links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://inwebjor.ru/uplcv?utm_term=immediate+contact+transfer+mod+apk PDF link annotation
    • https://mariapolis.es/ckfinder/userfiles/files/29924719799.pdfIn PDF document text
    • http://www.civilhospitalpalampur.in/img/uploads/files/lopumexijepisuwup.pdfIn PDF document text
    • http://vidiniaibreketai.lt/userfiles/file/xalasivilawatubasaro.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16130636b49439---24308654197.pdfIn PDF document text
    • http://rabotatver.ru/userfiles/admin/mafasomosonezixi.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/tobel.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/161348496c11a4---12356886780.pdfIn PDF document text
    • http://olympusflights.com/files/files/73476270133.pdfIn PDF document text
    • https://dyaa.club/uploads/file/41782704136.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/sulux.pdfIn PDF document text
    • https://vroa.pl/chplusfiles/file/3606684834.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/29343706967.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/16ad89eaf031eed3c263ab5037511326/xisiw.pdfIn PDF document text
    • http://laiyi-art.com/userfiles/file/18267900903.pdfIn PDF document text
    • https://juraganmonyet.com/contents/files/sivelazopera.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/lozuxewafid.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/b770ea62f4a4a8668f62334c22ceb03c/pimoxu.pdfIn PDF document text
    • http://pitin-akutsu.com/js/upload/files/fenogapav.pdfIn PDF document text
    • https://turkeyinsurance.info/images/file/85446952545.pdfIn PDF document text
    • http://i-p-p-c.com/ckfinder/userfiles/files/raritakakaliluxuranizag.pdfIn PDF document text
    • https://aptitudeclass.com/ckfinder/userfiles/files/diraxuperaribi.pdfIn PDF document text
    • http://hindustanadvancedsolution.com/t/tutorfirm/uploads/ck/files/lonep.pdfIn PDF document text
    • http://worthingtonpark101.com/userimages/riwuzud.pdfIn PDF document text
    • http://evpltravel.com/xv_image/file/kefumatapomugimajegaraz.pdfIn PDF document text
    • https://casadko.fr/userfiles/file/73347379590.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_off0000e8c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000100d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D5 17196 bytes
SHA-256: 904600f3ce9d29ab8145da8eb5e638fe5e290668e0ea1b802ccf399d4ba3acd8
font_02_sfnt_off00012d6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D6D 10776 bytes
SHA-256: f9e260961040fbef5045aed05bf52ede7bcd8ab51fd80bcf8e30786960c3e2a0

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