Malicious PDF — malware analysis report

Static analysis result for SHA-256 54de71a3cd40356a…

MALICIOUS

PDF

83.8 KB Created: 2021-09-14 01:30:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2c27d8eaddff418740c2bbde7e04e8ec SHA-1: 7b67be5f74f4b5ca724a4fc42608beb0a794b961 SHA-256: 54de71a3cd40356abbe49a26942988b33d3a4121239a8f86c6163b45b812ad58
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://catamma.ru/uplcv?utm_term=gold+miner+game+unblocked PDF link annotation
    • https://dbhattacharjee.com/ckfinder/userfiles/files/tijibefajomozu.pdfIn PDF document text
    • https://dampinggame.com/calisma2/files/uploads/38351981632.pdfIn PDF document text
    • https://linker.tw/files/66909230565.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/5658222950.pdfIn PDF document text
    • http://belv.ru/userfiles/file/mizoguxawekoxibo.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/putajexoxebejirebijole.pdfIn PDF document text
    • http://studiolegaletrotta.eu/userfiles/files/pofito.pdfIn PDF document text
    • https://gizaviation.com/uploads/files/suluwekoxo.pdfIn PDF document text
    • http://ventiliatoriai.lt/js/ckfinder/userfiles/files/waxaluzujezew.pdfIn PDF document text
    • http://aylincinarli.com/fckfiles/file/besuturilegegerakudafusup.pdfIn PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/gawuninovugez.pdfIn PDF document text
    • http://medtravel.lv/images/hand_uploaded/files/19444697224.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/27275935884.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/38635811572.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/161312a9c6a681---34515010564.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/61696864331.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/mekipabuxuxobepo.pdfIn PDF document text
    • https://atamergranit.com/userfiles/file/85229913003.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb9bf76830---87407537434.pdfIn PDF document text
    • http://eskuvoiiranytu.hu/blog/file/fedunovegopapofaz.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/ca719e77037a50cc6e42586133ad4995/fefejonojazodepev.pdfIn PDF document text
    • http://back2wood.de/userfiles/file/sopovobobixikobufefava.pdfIn PDF document text
    • http://bedrucken24.de/userfiles/file/rurux.pdfIn PDF document text
    • 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_off0000de97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE97 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6AE 10816 bytes
SHA-256: e145df2e06459ec4a36b2d9f815bc8a862306b26ae20080b6b04826521b0d30f
font_02_sfnt_off00010f53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F53 19292 bytes
SHA-256: 3752c6b92491871828307be8c09d275117a11158f60fe938f19c9175c581ca00

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