Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd81ede99a16cba6…

MALICIOUS

PDF

100.0 KB Created: 2021-09-05 01:56:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 58152f90fdeeadb60d9e5729a5c140ca SHA-1: 2fb9e8e82e5ce2beb5bdb0c0394b985dc562a9a6 SHA-256: dd81ede99a16cba6cc772eb7d3fff5fb1853c804024bbcd53e733ff2d5d323e2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, indicating a phishing or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious content or downloads. No scripts were extracted, but the structure and URL patterns are consistent with phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://queure.ru/uplcv?utm_term=mouvement+brownien+pdf PDF link annotation
    • http://dgjst.com/upfile/file/41105016568.pdfIn PDF document text
    • http://leakefamilyreunion.com/clients/63964/File/pitivurixazinirezaxe.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/kig5t6m0adtl7vg6va4d5toj74/bokexopekuwirijevedebe.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/98660274394.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/l6gauid78f33ckdaa0ioqkmq05/xupawamumejivikugazaw.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c03c4c39f06---84603102008.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/c8f38ef36b400531967e3359f7c38e37/24095737018.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/famibilimivirup.pdfIn PDF document text
    • https://gancza-yacht.pl/userfiles/file/46524401899.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/jefogexuxitar.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/171404045624.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/xinupusoniziwukebofani.pdfIn PDF document text
    • http://hzbmsj.net/images/upload/File/57459130342.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/8e9707508a3376485a89c50b82e6040f/kabikelejojojugeri.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa8634ef4d---4120114795.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e20c05be4---82060750697.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609695bea3d59---jofajenuluf.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/0fcc82e982504b961f20bf5bb9fedc60/gumubegirevotaketoxu.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/23742630631.pdfIn PDF document text
    • https://mamo-tato.ro/userfiles/file/5471804926.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a7de3651c71---gojonexajobit.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a60c4929143---dijujinaxam.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1606fac728fe1d---21230647296.pdfIn PDF document text
    • 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_off00011460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11460 10668 bytes
SHA-256: cfb89a4454259f5150a5a807ecbeb81f93e49f939ca637767cdf81b73f7a78b1
font_01_sfnt_off00012c95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C95 24472 bytes
SHA-256: 2015bb537541dfca78e31a5878b237875d475790accc67fd05a9b5bb0e8d9513
font_02_sfnt_off00016930.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16930 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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