Malicious PDF — malware analysis report

Static analysis result for SHA-256 827dbeeef034aa01…

MALICIOUS

PDF

327.5 KB Created: 2021-06-29 10:00:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 754c21a61202c7b8572b5d595477ad56 SHA-1: 408e1550613ab286badc1ee17e0babaaabd015ce SHA-256: 827dbeeef034aa01d9b0a10edfdef8b8b499727614cb406c503dfa1caeffac23
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to external websites, many of which appear to be hosted on compromised WordPress sites, suggesting an attempt to redirect users to malicious content or download further payloads. The presence of embedded URLs and the nature of the heuristics strongly indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 5

  • 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.
  • 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://infrive.ru/uplcv?utm_term=lucy%27s+nightmare+comprehension+answers
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/c50b73b28bbf9452e5aba51674ada660/73735173562.pdf
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1609efe0e7fcbd---36647027534.pdf
    • http://thegreenlegacykeepers.com/clients/e/e8/e8dc17949b7ef813e9937e453902477f/File/kuded.pdf
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d6133d85a90---55241074432.pdf
    • http://www.alex-vasilkov.ru/images/wisdom/file/jidut.pdf
    • http://lorichphoto.com/pictures/file/zowom.pdf
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dbed100158---semabonotekajapakanibeg.pdf
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d7de261ad---53345044171.pdf
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607306cf9043b---wedaxepax.pdf
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074c199b0cac---nerugodubatiwuropevonoxud.pdf
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609069759aea6---4244753447.pdf
    • http://aaaexpressheating.com/userfiles/file/29051426733.pdf
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160a046c5ca403---gizonumuwi.pdf
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609269bce81c7---sezanamor.pdf
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/bi1hfd92guv72em8d783sdgrnh/16910475455.pdf
    • https://jxloanchien.com/style/postimage/file/78216252726.pdf
    • http://circuitvietnamcambodge.com/hinhanh/file/91694082541.pdf
    • http://irinka.org/ckfinder/userfiles/files/68030305850.pdf
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca1a4abaaa---soboxabutimoxa.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092d2bef3554---pufiba.pdf
    • http://chickenwild.com/upload/contents/images/images/zisanatume.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0004ae29.bin
21142da7fe68e9eae12a275cb55f30f9211803a5ddaab710a4e3e23053159720		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4AE29 11068 bytes
font_01_sfnt_off0004c7e3.bin
0f21fe282bcdf15702ccf76212546592f76547a82303aaec02d4a7fa0480ffb0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4C7E3 18268 bytes
font_02_sfnt_off0004f779.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4F779 16792 bytes

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