Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f112554d4659c87…

MALICIOUS

PDF

82.6 KB Created: 2021-09-06 18:45:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d03815cd063f518caf5bb578617bdd5d SHA-1: 950e033c682312c8827b2217604a88d17b739fed SHA-256: 5f112554d4659c878412359845c0d0da00af384145363b847696c40390e443c2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to compromised websites, many of which are hosted on WordPress installations and utilize Super Forms or FormCraft plugins for file uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to download further malware or engage in phishing activities. No scripts were extracted, but the link farm structure is a common tactic for distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/cb31ca47fd64422231f681fcb830f08d/45311398892.pdf In PDF document text
    • http://meble-tk.pl/userfiles/file/58663075630.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/d2e76a3b4a02b5c89ef8e0a49611bae6/76319572518.pdfIn PDF document text
    • http://dichvuwebsites.com/media/ftp/file/7357375021.pdfIn PDF document text
    • http://zehanbiopharma.com/upload/files/67066213508.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bcc6587e8b1---tabigafalinuzujuwafobi.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d444758585---fogejana.pdfIn PDF document text
    • http://ekorob.pl/userfiles/file/dujotobajixivaj.pdfIn PDF document text
    • http://applexin.com/ttpsea/files/file/fopazirivoxokak.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16095f21c09e67---69549301249.pdfIn PDF document text
    • http://tafgambiatours.com/userfiles/file/15686622846.pdfIn PDF document text
    • http://pune-india.info/userfiles/file/43044448342.pdfIn PDF document text
    • https://kmkmekanik.com/upload/ckfinder/files/namefabitif.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/07c0f60caa8f2ba06379f7a0b9a63ae5/sexemaxixumupov.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9f00163d7---kuben.pdfIn PDF document text
    • https://sheenabusesandcoaches.com/userfiles/file/xowiwavato.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3be08d0d7---nexefobojewilapijuliguk.pdfIn PDF document text
    • http://techniq.ae/admin/uploadfiles/file/43538591979.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b457a29967f---vawinibosaxidaga.pdfIn PDF document text
    • http://linpus.com/app/webroot/userfiles/files/49103820000.pdfIn PDF document text
    • http://synowka.pl/galeria/file/lafesiparemezumeluleda.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/wajamobupomipowif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=assessment+and+evaluation+in+teaching+pdfPDF 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_off0000dcba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCBA 17760 bytes
SHA-256: 5ec320f8abc456683720fe8ac39d4843d031084647dae1a69b56db525aa15c8b
font_01_sfnt_off00010b01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B01 11116 bytes
SHA-256: fb16b9a45274ca1b3cc0a443919fd9e982f88db057ba7996bfa7014c37265680
font_02_sfnt_off00012491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12491 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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