Malicious PDF — malware analysis report

Static analysis result for SHA-256 82f398c32f86c3e7…

MALICIOUS

PDF

86.1 KB Created: 2021-09-06 18:49:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1b9d7b469eec5aa4646c6cf9d83449b5 SHA-1: efb515995e7ed3130ba142004e43f4dfadd9542c SHA-256: 82f398c32f86c3e7113d5873d4db147e3db616fdc88d1b65e44bddd0c8bc1cbe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded URLs suggest an attempt to redirect users to malicious content, potentially disguised as a PDF editor.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://maxtarget.by/ckfinder/userfiles/files/nilolexexupi.pdf In PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a45aded1b85---dazatubukasetorixudi.pdfIn PDF document text
    • http://www.celso.org/download/15839667745.pdfIn PDF document text
    • http://weiddy.com/uploads//files/202108021317138957.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/xomupixipagunejevovowom.pdfIn PDF document text
    • https://www.myosiaffiliate.com/199trust/img/file/peziloke.pdfIn PDF document text
    • http://oishisushigd.com/uploads/files/35137145095.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb8d7b0e6f---73315475207.pdfIn PDF document text
    • http://energo-market.ru/sadm_files/83529870802.pdfIn PDF document text
    • http://caopump.com/admin/userfiles/file/javofujadit.pdfIn PDF document text
    • https://atrax.hr/files/38057381094.pdfIn PDF document text
    • https://floridagreatescape.com/media/file/46844534068.pdfIn PDF document text
    • http://atomiccm.com/userfiles/files/50214247954.pdfIn PDF document text
    • https://pacpartner.net/images_client//imagesfile/43984422043.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076852abd672---luzub.pdfIn PDF document text
    • http://gpba.ge/admin/ckeditor/ckfinder/userfiles/files/454774525.pdfIn PDF document text
    • http://cuuhoatudong.com/upload/files/1449889217.pdfIn PDF document text
    • http://kimsanghun.com/upload/userfiles/file/20219133839913.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/5b3469fbff17ac87a0f7740346218b63/41126135300.pdfIn PDF document text
    • http://www.halpellet.hu/userfiles/files/47004211644.pdfIn PDF document text
    • http://arndt-fahrschule.de/userfiles/file/74488772121.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160989734b7349---15961933513.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160887aa8b3057---sijowamigul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=infix+pdf+editor+portablePDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d697.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD697 16836 bytes
SHA-256: 40d1a670ac604ac4c881563698db6c655b39c0989f9ceecd2a702c91a32f6558
font_01_sfnt_off000101ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101CE 16448 bytes
SHA-256: 0e4cde3d5bdd5452960de995a4807c8da4ec665155a9812e2f8e54e6c49b7878
font_02_sfnt_off000118a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118A8 10516 bytes
SHA-256: 06b550ba37c914c6fec6f0cd50bddf3601d5c3376fcaa9485e580f00265d74fb
font_03_sfnt_off00013070.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13070 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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