Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ff52036b6c4f66e…

MALICIOUS

PDF

157.3 KB Created: 2021-08-23 17:00:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: 4f5788a64f8015137a1a3ac03b0aecfc SHA-1: fef2dcfada10c1cfe5905057b0245495dc5a2ae1 SHA-256: 5ff52036b6c4f66e3f4f62e0667d6f7f249d11dc271b0b7d988e6c0a91157df3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

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://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/905d7d461278cd8a1d497b2c9fa09f93/jowixibulogovikujuramij.pdf In PDF document text
    • http://gesundheit-im-blog.de/userfiles/file/baparidabizorusovova.pdfIn PDF document text
    • http://moscow-vernisage.com/files/files/17236265316.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/340668634.pdfIn PDF document text
    • http://sbsinternationalschool.org/sbsisnew/userfiles/file/79697683296.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/be06383f0c3bfda14172a7e8789e70a5/52711344683.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/b24255f01f19bf3f88436134da023d83/77052093999.pdfIn PDF document text
    • http://megat.pl/uploaded/fck_files/file/28998103773.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160890562605f5---80123088413.pdfIn PDF document text
    • http://sieuthivatlieuhoanthien.com/upload/files/vamiwudewuninaz.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/dugijigegarudu.pdfIn PDF document text
    • http://gillsandgeckos.com/userfiles/file/tasejabalewalarimoz.pdfIn PDF document text
    • http://fotografiafrancescosomma.com/userfiles/files/doxuvizepeputojetulifug.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/0tumh9alt4u3s065duodnmd0nf/fudepuxolevuwaxajetogakeg.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/2d3b4b88fb0e8c89e4d2b7141dd8cdd3/92289065976.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/65591f481dca6fbe33dc8773a3510ffb/57551581756.pdfIn PDF document text
    • http://top1np.com/ckfinder/userfiles/files/18310937718.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/5e01ab018d2ba2b10b7e7ec4931a9938/gitojuv.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/226868caa24e82e96d551df5eaf93ac9/83360207215.pdfIn PDF document text
    • http://worthingtonpark101.com/userimages/63036809244.pdfIn PDF document text
    • http://waypl.pl/upload/File/63406291638.pdfIn PDF document text
    • https://dienlanhbachkhoa.info/upload/files/muzop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=fish+compound+wordsPDF 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_off00020748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20748 17764 bytes
SHA-256: b1e1a25b27008a3c989f88c925903416925b848934396c0266ab5091f8e08da4
font_01_sfnt_off00023622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23622 10504 bytes
SHA-256: 76896874c0a406f49f65233e5c64982e0bb207bfa08d3e28c7f8c8511a4cb59c
font_02_sfnt_off00024dd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24DD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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