Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f7268051ac8fe1d…

MALICIOUS

PDF

71.2 KB Created: 2021-09-03 23:09:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: aa3d65527fa482a947e6930dcfacfd6e SHA-1: 63bcb19cb16d599aa4e37c7eff770bf386041cc7 SHA-256: 7f7268051ac8fe1d6bacb38c21166d59dd5d3cc320d3ce156e6c55c48b69d7bd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous external URIs and links to compromised WordPress uploads, suggesting a link farm designed to redirect users to malicious sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for these links. No scripts were extracted, but the overall structure points to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://pixomot.ru/uplcv?utm_term=abstract+noun+worksheets+for+grade+4 PDF link annotation
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16079fa375ac21---52654483745.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d7d683572---mesolowefewexo.pdfIn PDF document text
    • https://wangwangcamp.com/uploads/files/202108311327403750.pdfIn PDF document text
    • http://teplospectr.ru/images/files/60688119724.pdfIn PDF document text
    • https://traiteur-troyes-mariage-buffet-aube-10.blaisot-traiteur.fr/ckfinder/userfiles/files/78386599294.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/tivufaduxatuvuwidula.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/jagabalesagepininid.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607effda0a6cf---bokegido.pdfIn PDF document text
    • http://livelyway.com/ckfinder/userfiles/files/88669227723.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/6sj8cluo538r57pji71n92j85p/roxinuvisu.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/s8t8ci069r6uqfmlpdscjj0tb2/50686602729.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/zogisaduvotelidopimekuwop.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/8236202ad5e221e3bf802e8e888f220a/90515875257.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e37bc26ae---90836220820.pdfIn PDF document text
    • http://coumert.com/images/file/labogijexixozumos.pdfIn PDF document text
    • http://eaupureinternational.com/userfiles/file/farenejozi.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac21f011d43---dewosuwujarugogiwenewuna.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/vowawuta.pdfIn PDF document text
    • https://suprizpin.com/calisma2/files/uploads/mabaxiliwetakonatutawe.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612497f9bcc61---jewet.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5d0abedaf5---57375485393.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/035u37mvg9at6675tqk73676k2/pajepe.pdfIn PDF document text
    • http://dafangtour.com/fckeditor/userimages/file/45654246374.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_off0000b4a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4A1 16040 bytes
SHA-256: 693d9eeb234a371b6bbc15595add8908d7c00816850e761a4fe3b3fa92afafdb
font_01_sfnt_off0000dd81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f598.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF598 11096 bytes
SHA-256: 349817fa340e3d2b0dea9437f9d8b2e57d46ee2663838207d920baee02847de2

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