Malicious PDF — malware analysis report

Static analysis result for SHA-256 aaf00a875139bbef…

MALICIOUS

PDF

78.8 KB Created: 2021-09-01 22:25:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 667df97fec5fcd5fa996eca89767f170 SHA-1: 1ed5075ca3a29778bb57c75bdc381530a37bb686 SHA-256: aaf00a875139bbeff26ffcd624749070eb2ff78430a9805826e2a4e8cb75b5a5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://crysiq.ru/uplcv?utm_term=henrico+county+general+district+court+phone+number PDF link annotation
    • https://namlongadc.com/uploads/news/files/27538497923.pdfIn PDF document text
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/35764254814.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/2c7311afffb4b180a8eff304cc9e71be/33824906908.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/kiwipifodosifemuzulo.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/96694694623.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609a11d79b6f9---31297010595.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210806143705.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/bejajaleziso.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/27773703752.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/87181794601.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/b21a6d19f611bebe6fcf3dce089f9105/bipokepokusopi.pdfIn PDF document text
    • https://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/40972468939.pdfIn PDF document text
    • https://bawaniint.com/ckfinder/userfiles/files/jesewuguzititikono.pdfIn PDF document text
    • http://detaycopymatbaa.com/userfiles/file/zoposajapamupuvonuwijog.pdfIn PDF document text
    • https://zegaoyun.com/calisma2/files/uploads/pijuvulelozuvupanowotawe.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/16081c56fd5925---21816240384.pdfIn PDF document text
    • http://donghotam.com/luutru/files/47694143501.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/73624528536.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160836594cb1e9---67390175100.pdfIn PDF document text
    • https://iphonerepairservice.nl/app/webroot/files/userfiles/files/jikativoxijowirixed.pdfIn PDF document text
    • http://cadeco.com/testingsites/advantage_aviation/assets/media/file/72107361438.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/ruxoxamawo.pdfIn PDF document text
    • https://holycrosshealthcare.com/userfiles/files/26956501800.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/89546591183.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc6304876ef---88968458414.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_off0000cdf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDF7 17760 bytes
SHA-256: 101fd262b78f7f29cd16ad17e723a0719e2d09951542154cd0b4fe2ec02f85f0
font_01_sfnt_off0000fb6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6F 11304 bytes
SHA-256: 9e940eef37553e7daa331c350597407ec39d2f0a23f1ad041577e3eb302c0395
font_02_sfnt_off0001155f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1155F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1