Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6c388bb238b57f4…

MALICIOUS

PDF

100.0 KB Created: 2021-08-03 12:23:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: ed8085dd0ad80a54dd92117cb7fb7ed6 SHA-1: 918ee44351b0e2cc14da4706284cbee6693869a7 SHA-256: f6c388bb238b57f412763746b357f3d97f358bb84c100c6f2abf3a696691bd52
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9910

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/a48e4b87fd26cb556a9cd0263f0be0cc/84665491163.pdf In PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160830b6a29c70---nozadabaso.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/sesubepeluwufizasedubiba.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088b5f831c58---nisetal.pdfIn PDF document text
    • https://ferdavagnar.is/images/fck/file/35499980144.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/78fa3c2efb2f588d4a8cd69b760040c7/85706725729.pdfIn PDF document text
    • https://kaptenhoki.com/contents//files/mufunukufibonew.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105d79abb34d---vexafiranuxanavafujup.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/marewagaferubewor.pdfIn PDF document text
    • http://sharidyer.com/clients/863431/File/64970294875.pdfIn PDF document text
    • https://ecobox.eng.br/wp-content/plugins/super-forms/uploads/php/files/qpopo1jbrn20r6o0uf1jbgeasm/47011336815.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/qg8tstr1dm379kgt8ckbvgrpl6/tujatujek.pdfIn PDF document text
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/65172825306.pdfIn PDF document text
    • http://serextion2006.com/js/upload/files/dopolerexogorom.pdfIn PDF document text
    • http://phutungquanghieu.com/app/webroot/files/ckfinder/files/jelogimogakelavomezupob.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/4292860210.pdfIn PDF document text
    • http://speed-r.com/js/upload/files/62364036837.pdfIn PDF document text
    • http://cjmjwarrickhudsonfamilyreunion.com/clients/9/9b/9be434dcd9982d5451de1b36a82eb828/File/kibadad.pdfIn PDF document text
    • http://dzbnf.com/upload/file///boguvotojidiferubewu.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/88728575942.pdfIn PDF document text
    • https://zlato-eu.cz/upload/files/nevefekapagon.pdfIn PDF document text
    • https://nangluongvada.com/uploads/files/11757886353.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/wakaniwogorarojexixola.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f5d6b9f73---wamatadavijorifekeruxulu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=friends+picture+quiz+questionsPDF 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_off00010bb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB4 17684 bytes
SHA-256: 4d6761da3bb827cfc2b6ce5ea4dd0735398be7823063432201d83f1315e94163
font_01_sfnt_off000139d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139D1 10584 bytes
SHA-256: 2bfea2f8fb9e1834ad576a25539d297af7c223448798e529bfb631ee3c2ed5d2
font_02_sfnt_off000151dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151DC 16064 bytes
SHA-256: 6be8c0c042521f5a71df7666660e0ab63b9e07567b17aa495b0122ea571483c6
font_03_sfnt_off000166ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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