Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a385c8229b29ff0…

MALICIOUS

PDF

76.4 KB Created: 2021-09-10 22:06:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: cf6bc72f0fdf0143eb36e8d56855234d SHA-1: 536b9c9e6b165ba612fe9589586730beafe6d927 SHA-256: 7a385c8229b29ff0090b760a646cec8c092a5c1fee6de76e88048315cfc8e732
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised websites or disposable hosting, suggesting a link farm or SEO poisoning attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL analysis point towards malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 http://fitviewer.de/files/file/vununosusoxunodudogu.pdf In PDF document text
    • https://escaletravel.com/userfiles/files/pediweza.pdfIn PDF document text
    • http://1yunnan.com/ckfinder/userfiles/files/ladedaxonefaxanopasages.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/xupizakari.pdfIn PDF document text
    • http://evopizza.lt/ckfinder/userfiles/files/golaja.pdfIn PDF document text
    • http://centromp.it/userfiles/files/18361344712.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-10/20210910205722814674.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/55669889043.pdfIn PDF document text
    • https://www.paseppe.gr/ckfinder/userfiles/files/vafobif.pdfIn PDF document text
    • https://livres-d-art.com/ckfinder/userfiles/files/4735310538.pdfIn PDF document text
    • http://defhjdr.friend-match.com/upload/files/35296285346.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcc09ef368---97145724456.pdfIn PDF document text
    • http://mercuresamuichaweng.com/admin/file/vozaseta.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16135108bed1e8---70851351334.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/9e4d6fec651632029d8ce05fa669edf3/29960642962.pdfIn PDF document text
    • http://rsport.eu/yonexshop/static/file/gogijonu.pdfIn PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/92301607561.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/64967704596.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/guzapijebifibolijederewuf.pdfIn PDF document text
    • http://namkhoabacninh.com/images/files/54832077815.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/82401133613.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16133f48c9fc17---47365136472.pdfIn PDF document text
    • http://ministryofrum.com/memlogos/file/tavila.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/35169724845.pdfIn PDF document text
    • https://tradegateindia.com/userfiles/file/votufebezisimulule.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/85787667634.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=asphalt+8+hack+mod+apk+download+for+pcPDF 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_off0000c5f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5F4 11028 bytes
SHA-256: 9adaaab813b637a841a0a5b0b5d35197c06e8e659017a9b26ed2fff25fc724eb
font_01_sfnt_off0000df96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF96 16940 bytes
SHA-256: 48e8b9f19276174c9c127eb3ac852d8dfc0f2314842e4fba92dd8e2258c62bb0
font_02_sfnt_off00010b71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1