Malicious PDF — malware analysis report

Static analysis result for SHA-256 c10a81f0e2e88954…

MALICIOUS

PDF

167.9 KB Created: 2021-08-10 09:52:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 44805fa0c0a1272b9f16f32749d2bfba SHA-1: dc00c5ecc2ab1166f66a4ec71a2b695fac9083f6 SHA-256: c10a81f0e2e88954c6cad5c8b6de0ff9a6b7ef60d79755e9e1356f03f8ea1657
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites. The embedded URLs are designed to lure users to these potentially malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7850

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://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/i3pbcm336g5t70b3ifimld4ll4/59809254926.pdf In PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ae6ec3cc61b---lituzime.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/1eafad38ae1f78118fab2a1163052837/ximometajekalofasavur.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/93892036417.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160a8391c44c1d---18476030588.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/35204902303.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608052efe6093---lakowivajavojano.pdfIn PDF document text
    • https://www.letspassdriving.co.uk/wp-content/plugins/super-forms/uploads/php/files/pkbss0qlj6b6a5u7ei2mdgaulm/xodomosipajitapijokuvuvo.pdfIn PDF document text
    • http://aptchasers.com/FCKeditor/userfiles/file/zelifepukakivotukosaxe.pdfIn PDF document text
    • http://massarentearchitettura.com/userfiles/files/fujujivaru.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee7cda229bd---2743060808.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/kibilinezulosuda.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/6ca556aaac0162ffcb1b69bb11ff958c/68569543062.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea0f7a8a0d---57797012829.pdfIn PDF document text
    • http://luberoff.com/userfiles/file/26534024315.pdfIn PDF document text
    • http://abwalabamaave.com/uploads/files/nigafifebodaredirabirew.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/dc64e10a8d78889c3a8af61cbbe28171/lubigiki.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/files/fixujixekajinilenif.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/bc3bf8d5a8e063b75d604f246e360e8e/nadozesofazel.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16071580544b0d---35352838511.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/menonorisusinipepu.pdfIn PDF document text
    • https://paardenwelzijnscheck.nl/app/webroot/files/ckeditor_files/files/jijal.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/13966117545.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7baba3fc4b---rajoza.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/74511173140.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/febn7nu0laqhsl8140sv51h0c4/duwoxovasatafomuxe.pdfIn PDF document text
    • http://kaithompson.com/userfiles/file/78785491774.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=sword+art+online+alicization+war+of+underworld+episode+18+memories+dubPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001d9f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D9F3 18180 bytes
SHA-256: 56ee27790d0160b7adcee7195ef6398f8a594afedb91a0bbbcbfae942e50ca37
font_01_sfnt_off000208e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x208E7 29708 bytes
SHA-256: 7ccd202176d961b1e0652e8090960ced2964297cb2432a2b002347a58f02f05f
font_02_sfnt_off00025b86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25B86 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0002739d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2739D 11500 bytes
SHA-256: 4c655d65d23b614dc1731a917d0986ded209dad5b1f29ac2244f31b9a1da32a3

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