Malicious PDF — malware analysis report

Static analysis result for SHA-256 206e3d1c5bfde3b3…

MALICIOUS

PDF

109.9 KB Created: 2021-07-06 03:12:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: acaabba227e2b0383b4fca14dd0c3915 SHA-1: 16c8e14856ed00dd6054f455a58670edec9fc912 SHA-256: 206e3d1c5bfde3b349487713b6ca680298cb4a1fa1abcc264efa080ce0e8e6ff
156 Risk Score

Malware Insights

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

The file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous URLs pointing to compromised WordPress sites, suggesting it functions as a link farm designed to redirect users to potentially harmful content. The PDF structure and the nature of the embedded URLs align with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/e83c9b307643727ecc2e0a584f58d11d/44418354093.pdf In PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed3a8497f7---17779058162.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/67k5vi8n7nj2sde87ctpun4sov/45703796643.pdfIn PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/bosowavi.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/8f1832e5e3a837fb68e7a945bd12b229/54931607249.pdfIn PDF document text
    • https://ficsllc.com/wp-content/plugins/super-forms/uploads/php/files/8qns57dvu2hm0arkhhkn91aide/38150021034.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6001a6c057---40574940572.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/58837af394d5a9c7e158f4fbd6cb7d97/38932727774.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/33999107938.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/54474221842.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/63018892346.pdfIn PDF document text
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/81235920212.pdfIn PDF document text
    • https://mldom.xyz/web/img/podborky/files/21816164349.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/7b6d500ce7460493bb2b61dab3ed8afa/wujiridalibusotawodojob.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a274ed47c52---zonumejutefapeginebeso.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608ac8f7bd7d7---85202966073.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c92a01911f---53983605559.pdfIn PDF document text
    • http://teleserviciomalaga.com/ckfinder/userfiles/files/36017997678.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/85163584871.pdfIn PDF document text
    • https://dock-levellers.com/upload/files/17858369506.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9833c08ae---komidifumetod.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/sunutabipikafakakafirisi.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160733eb3a0b3d---filonojofarag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=frosthaven+character+cardsPDF 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_off00014bc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BC6 17708 bytes
SHA-256: 54e5253bc6003123f8d51fddcd8f72c4761c02208f93275939ed70b1a077ee41
font_01_sfnt_off0001797a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1797A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00019191.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19191 10372 bytes
SHA-256: 6dacfe4cbfd622aedf16ad24cf46df95eacb98bb89167b5ef3117b54d67f8c6c

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