Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9656a68fedd36c8…

MALICIOUS

PDF

80.3 KB Created: 2021-08-15 00:51:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5ccbb548c17d0105386541f6e2463f8f SHA-1: 8209510d6492d4fecef64da4e37c05e670156501 SHA-256: b9656a68fedd36c8eb39db89db792409fad0587ccce4003dfe8f5876d1c58d31
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The file's structure and numerous URLs point towards an attempt to exploit users by directing them to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://smidgel.ru/uplcv?utm_term=alfred%27s+basic+piano+library+recital+book+level+4 PDF link annotation
    • https://etcbt.com/userfiles/file/78515951317.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/3t3rj466f68of2uh96gdhst180/33945672150.pdfIn PDF document text
    • https://villanakarin.com/userfiles/files/wikelopimamigaxopozuruga.pdfIn PDF document text
    • http://sciattella.net/images/file/rorezepeto.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/83043093201.pdfIn PDF document text
    • https://murten-hotels.ch/userfiles/files/88900593362.pdfIn PDF document text
    • http://cosmickino.ru/sadm_files/vugidenuwamiwadukuze.pdfIn PDF document text
    • http://umiyawoodworks.com/fckdb/userfiles/file/dokefefunupenematoz.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160835f4290948---77356887466.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/9751790511ab7c9f8776ca09cc49b322/jojuwapo.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/17478203008.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/fupupajurer.pdfIn PDF document text
    • http://www.mezmat.ru/ckfinder/userfiles/files/41322869642.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16082df2097dfb---vujimutojesakulagi.pdfIn PDF document text
    • https://coebmsf.com/userfiles/file/66213581759.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dec0035c6e7---50927166966.pdfIn PDF document text
    • http://rioairporttransfer.com/ckfinder/userfiles/files/jakes.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/57363123113.pdfIn PDF document text
    • http://americasbestmanassas.com/uploads/files/modetaseza.pdfIn PDF document text
    • http://urjabatteries.in/userfiles/file/9397883938.pdfIn PDF document text
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/250241463619.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/e72cf27cfaaaaa59c2970db48169d0e3/rabemewosurisosijovo.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/b856e7801df28aadafd291493857ec91/89201974196.pdfIn PDF document text
    • http://naturallymine-chicago.com/clients/867610/File/baxavab.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_off0000d385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD385 16908 bytes
SHA-256: 6e31075e981ea0096bf060fb83121520b26995a2f3681b398549b488b4d1c21f
font_01_sfnt_off0000ffe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE4 11120 bytes
SHA-256: 34e62953fe345c34537089ca9349206e5d9b83c7e0d188d45ae38040ac230387
font_02_sfnt_off000119e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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