Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c34a40dbec9eb51…

MALICIOUS

PDF

79.5 KB Created: 2021-08-11 14:04:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4f6722f2435512cf1e4b98ea98b1a3d0 SHA-1: 19ca5a10a316164d587b373ab749674914445543 SHA-256: 7c34a40dbec9eb51f04cd65e2e90bd0ea275d0d8f58dd1bfad4f92417b79266c
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous domains, several of which are identified as compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO spam. The embedded URLs and the nature of the link farm suggest an attempt to drive traffic to malicious or compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://toonesk.com/upload/7046128163.pdf In PDF document text
    • http://blatt-gruen.ch/files/rideme.pdfIn PDF document text
    • http://thecreditcrisis.net/clients/73966/File/disotesofufize.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/e70fa0516e95ae4da8ef29c7255639dd/sudebenutefukulel.pdfIn PDF document text
    • http://rdmsrl.it/userfiles/files/vijelovawudijekak.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/wedemutiregelugibefaxipas.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/39516804995.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/7b4b3048ba8edab657f6d690cb4f83b6/77198245594.pdfIn PDF document text
    • https://www.blondel-bois.fr/ckfinder/userfiles/files/vixupazidoluvefofumukepa.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/mn4t49v5vhnomnevnfgsrj8cjq/rugixinuriwonow.pdfIn PDF document text
    • http://kientrucsangtrong.com/plus/files/45663502684.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/779602d04e6a4d769229ca9a7056ffa6/67587984357.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/0195a5150a6c3472950d2d29ecfb8111/59016776766.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c85a9a1ef58---72232938418.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/4ojdac8qrlepsfemd2pdqbinem/57972592574.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c96424b6c4f---72008640135.pdfIn PDF document text
    • http://stonebreaker.at/88897270670.pdfIn PDF document text
    • http://www.gdchgs.com/admin/img/files/rizifofejuburule.pdfIn PDF document text
    • http://taiwanglassgroup.cn/userfiles/file/17283235249.pdfIn PDF document text
    • https://giolog.biz/images/bulk_images/files/vogulafifubuvupagafoxup.pdfIn PDF document text
    • https://oddluzanie.net/userfiles/file/guvododorikek.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd74866696c---tepisatesaxafawujetulew.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/etcplu30lukt63qrk159pap5t7/35879712992.pdfIn PDF document text
    • http://soflacops.com/clients/83266/File/rubikomitotidagaxawir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=electrical+electronics+symbols+pdfPDF 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_off0000d3db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3DB 11016 bytes
SHA-256: 94eb1f6e6c3cf4aa3fc2d6116698dfd51e66649eb9d7755ba5fa9ca2321dbb5f
font_01_sfnt_off0000ed3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED3B 16120 bytes
SHA-256: f9c48c0aaf6286cc915df5d18645ee7a9667b20f7af8d103d6b20577261c02ba
font_02_sfnt_off000116d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1