Malicious PDF — malware analysis report

Static analysis result for SHA-256 971c3eff71a1a9e8…

MALICIOUS

PDF

81.6 KB Created: 2021-09-09 05:29:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c1f3355c6cc2a473e3e9614b22890492 SHA-1: ac372317f9cd1a86884f5a5ef487e4a9907ceecc SHA-256: 971c3eff71a1a9e8bfcaf3bdcd9ab69f4e2566905af627edc4d23dc9f0ea8322
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded JavaScript indicates potential for further malicious actions, such as downloading additional payloads or exploiting browser vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • 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://krisoc.ru/uplcv?utm_term=caesars+slots+mod+apk PDF link annotation
    • http://knuhpharm.kr/userfiles/file/20210909091637.pdfIn PDF document text
    • http://www.portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/risuleso.pdfIn PDF document text
    • http://phukhoabacninh.com/images/files/suvutilonujaxodomovetata.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/movijitawokovejiguwusemu.pdfIn PDF document text
    • http://mega-treid.com/userfiles/files/61849878127.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f6d2d18a5---nikusazebebiruwadagutasuv.pdfIn PDF document text
    • http://www.accessibilite-salle-eau.com/ckfinder/userfiles/files/naxewefibufisezizi.pdfIn PDF document text
    • http://vitalbafitnessclub.eu/userfiles/files/binojotubasopefuw.pdfIn PDF document text
    • http://xn--h1acbpobggs.xn--p1ai/data/files/59210292332.pdfIn PDF document text
    • http://bunny888.com/ckfinder/userfiles/files/dopenipefajevotak.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/3548078925.pdfIn PDF document text
    • https://www.multilandtours.com/assets/ckfinder/userfiles/files/36222581310.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/161333d557173f---39718479552.pdfIn PDF document text
    • http://to-tuong.com/media/ckfinder/files/14071683241.pdfIn PDF document text
    • http://businessvaluationapp.com/fck_files/file/49774695217.pdfIn PDF document text
    • http://asia-test.informacittadino.net/media/files/xewarusan.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/62419871903.pdfIn PDF document text
    • http://quaisetoiles.fr/img_pages/file/37618292502.pdfIn PDF document text
    • http://physocare.com/Images_upload/files/zutewuvobupofo.pdfIn PDF document text
    • http://519pf.com/userfiles/files/xetuxemibedegivupezuwuf.pdfIn PDF document text
    • https://indiantiffin4me.com/nbloom/fckuploads/file/werinituregox.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613460d013fc1---15236065477.pdfIn PDF document text
    • https://fototipia.hu/files/files/34470621164.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/a3a05523cc35a6464b993bb9845801ac/xuxibupemamoja.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_off0000d780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD780 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF97 10480 bytes
SHA-256: 0f6075765468a4962e9239b2201cf07fc626738933799a226b6642e1522e944c
font_02_sfnt_off00010773.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10773 18900 bytes
SHA-256: c33eca69703d6d3dc891015a59c7270ebaf977ca78a6860ecd36a820cda3f00a

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