Malicious PDF — malware analysis report

Static analysis result for SHA-256 65e749d4c0abaeb0…

MALICIOUS

PDF

77.1 KB Created: 2021-09-08 02:09:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d7788e87c3645162caf0229216a04a20 SHA-1: 1436c44ee202605d8332fc11155046ed27f67513 SHA-256: 65e749d4c0abaeb01117470fa541d99987e23aa3945b6163e10f6fda895024ce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting a link farm or redirection mechanism. The primary purpose seems to be directing users to external malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://irlanc.ru/uplcv?utm_term=math+worksheets+for+4th+grade+equivalent+fractions PDF link annotation
    • http://www.oiseaubleu-promo.fr/userfiles/file/bunakasadewirozox.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/9ce12493b65c64c0f5cb443738fb35ba/dases.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609af4e1cbb7e---95130132579.pdfIn PDF document text
    • http://orvositudasbazis.eu/images/upload/file/jigenilewefot.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/dekiguvoxukesupus.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/35353292662.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/5909400795.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a840c8434a7---20880536152.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089292731396---42418758077.pdfIn PDF document text
    • http://andreuma.madteam.net/ckfinder/userfiles/files/rimeweromokekajapopa.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4534785886---30076635896.pdfIn PDF document text
    • http://bantinnhadat.com/users/files/siwelikabudifozetasepezaf.pdfIn PDF document text
    • http://ever0036.com/assets/uploads/ckedit/files/20210614115229.pdfIn PDF document text
    • http://jysfh.com/upload_fck/file/2021-8-12/20210812162840380420.pdfIn PDF document text
    • http://akgwealthplanner.com/crm/files/kewupimim.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/90320146895.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16077f847c0933---47377721047.pdfIn PDF document text
    • http://www.farmaciavictoriayjmleon.com/userfiles/files/nijoxitan.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e539069feb---21355237500.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/f17b1b53b789d0f8383cd750082c3f9c/pebemesifomosuve.pdfIn PDF document text
    • http://mcap.cz/images/uploadedimages/file/gawijosefixef.pdfIn PDF document text
    • https://tripleccompanies.com/wp-content/plugins/super-forms/uploads/php/files/385f4adeb73e41f7fa9a81740ec607fc/noselobolavofilebe.pdfIn PDF document text
    • http://prosquash.by/data/62975035864.pdfIn PDF document text
    • http://ibb-online.ru/f/file/febora.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_off0000c694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC694 11316 bytes
SHA-256: 1c8df5d0646695d366d9f0359ea1bc02473df3d8c4527fb7022361a48a064c2a
font_01_sfnt_off0000e0c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f8da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DA 17436 bytes
SHA-256: ec18a4e4bd4a1993f810256dc3b1180867157ac132b45cd0777c47e71d4da128

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