Malicious PDF — malware analysis report

Static analysis result for SHA-256 090d5c8e3382ac7b…

MALICIOUS

PDF

80.1 KB Created: 2021-09-07 03:01:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a62b9da1ecf767f3b9af22bf96f22ec1 SHA-1: caf7615aa0676caea5bf2417273a08e534da82ff SHA-256: 090d5c8e3382ac7b354cde27aba704f4c212ff9bcf04c54162486725b54c0775
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as containing a link farm pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV also identified it as malicious, likely a phishing or trojan distribution attempt. The embedded URLs suggest an attempt to redirect users to malicious content or exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://upbilbao.com/ckfinder/userfiles/files/lasomubozururarixufiba.pdf In PDF document text
    • https://quangcaowebsitecomvn.xemlaco.com/uploads/files/wowikikigijikexesuzogen.pdfIn PDF document text
    • http://kamerton.nl/clientfiles/31864964108.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/fajekapebu.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/25525209681.pdfIn PDF document text
    • https://wrd13.com/force/file/58122308543.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075e0e10f229---94353773300.pdfIn PDF document text
    • https://razredna-nastava.net/files/pubalur.pdfIn PDF document text
    • http://hpworld.hu/data/pic/Image/file/12114858164.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609de01dae7d5---86604605533.pdfIn PDF document text
    • http://rigosarchitects.gr/userfiles/file/sexawudokelugotolilowu.pdfIn PDF document text
    • http://auldskoolrocks.com/clients/878384/File/94935426962.pdfIn PDF document text
    • https://orderpoet.com/ckfinder/userfiles/files/25324909207.pdfIn PDF document text
    • http://www.jucadent.es/ckfinder/userfiles/files/25080332463.pdfIn PDF document text
    • http://ulv-fogger.es/d/files/ganijuwamunokezumibukoza.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/5c7l8vdrmglltqj5dlpqkmr7t4/16337569587.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/71128984149.pdfIn PDF document text
    • http://k9careclinic.in/ckeditor/ckfinder/userfiles/files/rinexutoxaxupiranaz.pdfIn PDF document text
    • https://apotekatia.ba/fajlovi/xalelexenavuresisitulado.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/2a4e549358c4f1ea7f9fb542458daa99/xaxoxubotosura.pdfIn PDF document text
    • http://mextro.de/upload/files/3030326974.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/11915443715.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b960c1b4cb6---pigolazalumanufulusu.pdfIn PDF document text
    • https://iwnta.com/userfiles/file/wawoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=kato+crane+25+ton+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_off0000d285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD285 10476 bytes
SHA-256: 0c1581abcdc7c32e02757bbdd4e560ea6b0fe16adf73e07e61d00d22769145f9
font_01_sfnt_off0000ea76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA76 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10288 18600 bytes
SHA-256: c75c2be3b4c2f54ec7b078d3e74225906fb08d152bf29df287501c02cf8db6d5

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