Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0b954615ee75f90…

MALICIOUS

PDF

98.3 KB Created: 2021-08-13 20:56:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c09c97097848731e7c4d65dd899acb25 SHA-1: ddda5b3af0edeab35633c78e4364225e4bccc655 SHA-256: f0b954615ee75f906011954b6965f26457b31e7e71bc7608be69f3f829deea7d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm directing users to multiple external websites, with several hosted on compromised WordPress upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The primary attack pattern involves luring users to potentially malicious sites via embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://panama4d.com/contents//files/55649208743.pdf In PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/87535386949.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608f671644c93---42131242223.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c5ef75cec---35924505123.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/57205605092.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098c3d2f3eca---35423063614.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/cfaa06qmt8t7p6er0i78t7e6ia/lizodejubivutuwemer.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae7bba1973f---79466908778.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/77472044011.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/53430046767.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210705050416.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1610c70f6a372e---woginarel.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dc3a32bd6d3---57253323877.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a982af02f31---72032946041.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/92554112582.pdfIn PDF document text
    • http://chandigarhdatarecovery.com/files/file/23936622402.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/gg72d7hh7p1c0vtmuc9v8lnrva/19235759689.pdfIn PDF document text
    • https://aprenda-atdi.com/uploads/files/39290535313.pdfIn PDF document text
    • https://www.nexidia.it/wp-content/plugins/super-forms/uploads/php/files/c6b635c44c092e491e8c415e2c4cbfd6/99345130370.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/27372507658.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a24a86a9212---sivunixodogumivobuzojo.pdfIn PDF document text
    • http://dnepropress.net/files/file/gozulajus.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/86964147254.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/5619fd8026995c9cc404f686c3f66f36/tolexumaketajewid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=roles+dentro+de+un+grupo+socialPDF 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_off000118ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118CA 10832 bytes
SHA-256: 5983d198f6d49571206b7d9e087d4d52431df439f2ec4c6c657c6c4a7235be24
font_01_sfnt_off000131b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000149ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149CA 18364 bytes
SHA-256: 15817cb339fd58af3b94a05d7454fce5479144e6273b0bd3161c946e6327a05f