Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed4709b1f0612182…

MALICIOUS

PDF

79.6 KB Created: 2021-09-02 02:07:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7612e2d7cb6df41015aa7a3071783e97 SHA-1: c7004d7bc9a3a7eb3836f5db6f0c006cc1d7ea92 SHA-256: ed4709b1f061218217ce0e7803f461081633ed7ab8bf8ec6033072c2c7a712ea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URI heuristics and the ML classification indicate a high likelihood of malicious intent, possibly for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://vildmarksjagt.dk/userfiles/file/26671319696.pdf In PDF document text
    • https://mkontakt.pl/dat//file/94143134618.pdfIn PDF document text
    • http://bjsprt.com/uploadfile/file///2021051406171932.pdfIn PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098564cdd5f3---74326580199.pdfIn PDF document text
    • http://studiotecnicodambra.eu/userfiles/files/rixogeki.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f957c6275c---25244971679.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/87a36bb38848aec1b5c9a39da3a8054f/10620985630.pdfIn PDF document text
    • http://pcccphucvinh.com/upload/files/gufipabubodewoxenujunan.pdfIn PDF document text
    • http://skkl.cn/filespath/files/20210813164721.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607caf503be5b---73487614771.pdfIn PDF document text
    • https://butchercurnow.com/img/shop//contents/51878990789.pdfIn PDF document text
    • https://nanosoft.mn/images/content/File/somusizepedepikuwibidase.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a929d2b3bd7---10145802028.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160706fbab75f3---85235794191.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/gajobavunorenobokoxezup.pdfIn PDF document text
    • http://www.mostex.sk/files/articles/file/xuzixoxupubetosozupise.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/7vr0khejutt2i3hgbsjsdtq4u5mhkrgl/mivolawewobedawuduj.pdfIn PDF document text
    • http://yourbuilding.ru/userfiles/files/98708867923.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a100cceb7---kisagej.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/2dm6ubj161qcqnsnnt78bl8jaj/77040164635.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160b600ba11279---69757735724.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/f698857058a9195efe2bc0f40eecacf9/1126156501.pdfIn PDF document text
    • https://zenkenmoshi.info/images/files/file/rafalut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=pdf+apps+download+for+pcPDF link annotation
    • https://www.unimedbelem.com.br/painel_template/assets/global/plugins/ckfinder/userfilesfiles/sofofokapizenalovu.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_off0000d2e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2E6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eafd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAFD 10380 bytes
SHA-256: b7ad7690d63000057e744c5b16d76d86cb0780c0ee4dce1b4c7180f7815aeec2
font_02_sfnt_off000102a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A1 17652 bytes
SHA-256: 3c8c6f503b57137310386b7141d85d04746bcdbf5a2c51c204950d98e326431a

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