Malicious PDF — malware analysis report

Static analysis result for SHA-256 455f537ce7ee7f58…

MALICIOUS

PDF

90.7 KB Created: 2021-07-31 05:56:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9323da7910332b55f140c54800380b8a SHA-1: e047bbe80e1b12d8167d44b7dcf1cba71fd4dad6 SHA-256: 455f537ce7ee7f58871e3caea3e0ce455b1a71b8513b637fc15ea88ebcc0ef5d
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress sites and other disposable hosting. This behavior is characteristic of a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent.

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://boyanbolyarski.com/userfiles/file/59600772022.pdf In PDF document text
    • http://beastyenergy.com/userfiles/file/wigimuwu.pdfIn PDF document text
    • https://szabobuszberles.hu/files/files/gezunejabazadu.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/64007915571.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/1e24bc636572b2d4e15b28684116f5f2/kekexajewijidaxevulen.pdfIn PDF document text
    • https://alubiasdetolosa.com/files/galeria/files/65868838969.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/5b9d92932fce89c1436d92d9ed992a1d/42447480336.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/b5b499997bd150a7a5f33836ce7857bd/74750687391.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/27389823738.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9d4b8d44c---41222131439.pdfIn PDF document text
    • http://walkofagesvt.org/clients/0/0e/0e42319052772b195a43ba3ede0f03e0/File/5761265418.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/bemalinixoradim.pdfIn PDF document text
    • http://burchiellati.com/file_fck/file/mamokirabo.pdfIn PDF document text
    • http://asustainable.com/global/file/15222364571.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/4d4704548b1e184b0cf363b18b81b24d/desedulojugopofoviwuwunev.pdfIn PDF document text
    • http://1960vonsteuben.com/clients/d/df/dfb5e1b83ea85bfdc5ef1da934264264/File/gosafamatazeke.pdfIn PDF document text
    • http://samuiluxurytravel.com/Uploads/file/64260766352.pdfIn PDF document text
    • https://preprodpcb.com/userfiles/files/34580824723.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/c8b6dffe37ccabfb7ba8eff0cde385c1/dijavibuvesulezalagonoz.pdfIn PDF document text
    • http://alohatoypoodles.com/clients/1/11/1122824db0f83c9e74cf39311881f217/File/78377324756.pdfIn PDF document text
    • http://malverne69.com/clients/a/a7/a743c233813d1a1dbf5c38c484d85cdc/File/84100542920.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/f5b66b5caba472b576405fdd9f23203b/3020753839.pdfIn PDF document text
    • http://kayapaliinsaat.net/file/juferiwar.pdfIn PDF document text
    • https://ntct-dz.com/ckfinder/userfiles/files/89416495425.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/57471482653.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=the+rule+of+three+eric+walters+summaryPDF 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_off0000ffbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000117cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117CF 16732 bytes
SHA-256: 5c57c6654ea07269f88945e13b0370c999833b0747d0d07d988d85fad62d9de3
font_02_sfnt_off00014350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14350 10760 bytes
SHA-256: 393b4596be1d473ab1fcb2c6f4e4d2543ddf83ceb8e19cd42393395d8f935dc1