Malicious PDF — malware analysis report

Static analysis result for SHA-256 859f1d4dae3ed756…

MALICIOUS

PDF

85.6 KB Created: 2021-07-22 02:31:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e77492f3297e341b4a3c22b32ec0be2c SHA-1: 2f8e79b3ac7341d670a96bbf969f0d49a5ed907f SHA-256: 859f1d4dae3ed756fdad7f1933a80b494358132b9938a00ed4618fac4404f2df
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to compromised WordPress sites, suggesting an attempt to redirect users to malicious or phishing content. The presence of a link farm on disposable hosting and compromised CMS upload directories further indicates a malicious intent to distribute harmful content. The ClamAV detection and ML classifier strongly support the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/e1ut6onkfss30ka6i9n3n20a35/wujapimavobibudatasega.pdf In PDF document text
    • https://alice-immo.com/userfiles/file/24032047699.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/49289813921.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/7d4a54b9771594fc2bc4f26bcdf46037/12475686124.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e288f026ea---bosivazimevukalesefam.pdfIn PDF document text
    • http://rhodeislandalpha.com/clients/56223/File/lipixikeruxeziwoji.pdfIn PDF document text
    • https://korzayithalat.com/spot/admin/fckeditor/userfiles/file/15501256056.pdfIn PDF document text
    • https://zapret-rf.org/web/img/podborky/files/bopaxebukiw.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/18179764389.pdfIn PDF document text
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/menigenozas.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/8h83ovt0u8pnvajhqsspjkr1nd/23404560602.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aafca28af8a---sumeta.pdfIn PDF document text
    • https://u-spot.biz/js/ckfinder/userfiles/files/perenemudumesilon.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f6c359035---mojojaw.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f09a4e6d08---fozewoxuvodojofun.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/wuroki.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/xozajobuwevujo.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/13b3496960f32bb2b46bd4f12e512ba4/27840496112.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b007b463219---fafoxowiputuzadisugozuxud.pdfIn PDF document text
    • http://dekogard.net/deko/veri/_files/diguju.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/i7iop6grso6qttd4fgc46868t1/bajipod.pdfIn PDF document text
    • https://amsteroverseas.com/ckfinder/userfiles/files/55820546865.pdfIn PDF document text
    • http://northwestpixie-bobs.com/clients/e/e1/e1941a3904c49320334fd90e0ed9e852/File/99943425611.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+invite+xbox+players+to+ps4+minecraftPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#Referenced by PDF JavaScript
    • http://purl.org/dc/elements/1.1/Referenced by PDF JavaScript
    • http://ns.adobe.com/pdf/1.3/Referenced by PDF JavaScript
    • http://ns.adobe.com/xap/1.0/Referenced by PDF JavaScript
    • http://ns.adobe.com/xap/1.0/mm/Referenced by PDF JavaScript
    • http://ns.adobe.com/xap/1.0/rights/Referenced by PDF JavaScript
    • 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_off0000e9c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C6 11220 bytes
SHA-256: 3da7d6676b3f962c6dd4969b19fac0db6c89dc040ff7b01630d25eabccc6d9d2
font_01_sfnt_off000103f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C05 16900 bytes
SHA-256: 5ea5b9d89af8c82b4cc0d26ba2190df58ac85c2afdd0dc8f275dca9d4a5edabb

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