Malicious PDF — malware analysis report

Static analysis result for SHA-256 066e0fe7ce701c36…

MALICIOUS

PDF

84.8 KB Created: 2021-08-16 20:23:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b1e0f5c8be84edd35f398754682cdd66 SHA-1: 20de9eb341e367d3e258e991ac0dd702978cae4e SHA-256: 066e0fe7ce701c36d0448080da2e11dfd72d256309094122a8f081802549f66e
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed for redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the overall structure and URL analysis point to a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://mweb.cz/images/file/mopesujiwebodasutiwipuxi.pdf In PDF document text
    • http://fixafilm.se/userfiles/file/34505685327.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160eca19d180b6---xibuni.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/ae9d0be173d178063223998c173191d1/39943108791.pdfIn PDF document text
    • http://kath-kiga-bw.de/bilder/berichte/file/42918822447.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/rodipeso.pdfIn PDF document text
    • http://waypl.pl/upload/File/93663821649.pdfIn PDF document text
    • http://teraval.cz/res/file/gufokanigitogebutofaxo.pdfIn PDF document text
    • http://1-cities.com/blog_images/blog_/file/boxumidapa.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c16486ec27---goxitojisikovusewapedap.pdfIn PDF document text
    • https://hospvetcentral.pt/site/upload/file/bakegaritesezuzowet.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/85696299310.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/908c649916ed473241e927dd5d7abc0e/wutaravoxite.pdfIn PDF document text
    • http://womenscouncildallasarboretum.org/clients/85748/File/nodoj.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/pd1jhs67lkcups1346u9i5l2ca/getasukejewinet.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/pebasadufe.pdfIn PDF document text
    • http://renknh.com/ckupload/files/gunekukaxesa.pdfIn PDF document text
    • http://donleroy.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/53052523750.pdfIn PDF document text
    • http://kukubara.com/zdjecia/file/monolidovuvazomalusu.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16076f5843208a---biwixomom.pdfIn PDF document text
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/577860a1cb2e153ded01b34da32130bf/52360043748.pdfIn PDF document text
    • http://webhenevents.com/clients/868374/File/56075041063.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/65527918193.pdfIn PDF document text
    • http://righetti-ticozzi.it/userfiles/files/gigafimajubefake.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/jipom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=acer+aspire+3+a315-21+user+manualPDF 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_off0000e60e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE60E 10908 bytes
SHA-256: 20b6c70407850be7fd429c6a2be11dee72acecf339af31b889ef8b84b6c9a139
font_01_sfnt_off0000ff64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF64 16868 bytes
SHA-256: 2a0d27f024e43b2f81a6220944351d7c91bfabeedf0bf07b75515055fc276f90
font_02_sfnt_off00012ba8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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