Malicious PDF — malware analysis report

Static analysis result for SHA-256 d966e98087ba04ff…

MALICIOUS

PDF

84.3 KB Created: 2021-09-04 21:15:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 789aec69790524ccb89b5601ef3ebe31 SHA-1: 573e1cbdf0edbff3da2f5dcdad74b23f07539829 SHA-256: d966e98087ba04fffd44f9fa3eb7fc9b8d7dc20f6764ef860dcf56055ff13c07
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of link farms suggests an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/ra5lco15iki5psi8e5nqiekjfl/36399077283.pdf In PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ce1f286da9e---kekarerovekuvajasojavebe.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/c8d1dv70fs5pms6g6hp1vpq8qm/jetakawixim.pdfIn PDF document text
    • http://theclubburger.com/uploads/files/92932116798.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16077f0dd87351---39165374328.pdfIn PDF document text
    • http://yilip.net/userData/board/file/22523894655.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/68511961744.pdfIn PDF document text
    • http://autosvilar.com/uploads/ckfinder/files/45381627577.pdfIn PDF document text
    • https://gtselect.fr/ckfinder/userfiles/files/melozapu.pdfIn PDF document text
    • http://chrisdepanneservices.com/Sites/cds/files/novesezezenigebusez.pdfIn PDF document text
    • http://marinda.ru/pics/images/file/wefipogiwegugita.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/b4c367123e13cdb2d80a7d4aacdf23b8/37012893539.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/16bc6a817726cda7b58757ba9ca34311/gokusubid.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/79778138150.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/navufozabukafamavoxo.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160b032059c99b---xudanisulematujaron.pdfIn PDF document text
    • http://hillsdale66ersreunion.com/clients/c/c6/c679c52642bc64dd8629b98fb95ccc77/File/zivanadifejufukute.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/49677522601.pdfIn PDF document text
    • https://jackinthegymtpe.com/uploads//files/202108130623591744.pdfIn PDF document text
    • https://666666.vn/upload/fck/file/63647906336.pdfIn PDF document text
    • http://www.knickmeier.net/images/pageimg/file/14210299028.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=medela+freestyle+manualPDF 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_off0000e2df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DF 18912 bytes
SHA-256: a52ec55ed653c301f9ef6437906f1aa909a09d87e6dbd5a1e2d517f2a7e828ef
font_01_sfnt_off000113a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A3 10508 bytes
SHA-256: 92c1adae4644f8c24ea1a8566d69aa89e25d3479fe36a7d0dc09fa6f63dc13e8
font_02_sfnt_off00012b99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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