Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1a8b683ddb82b09…

MALICIOUS

PDF

70.7 KB Created: 2021-08-09 17:31:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 709d49ceeda2ec6fc5bead09d204aa4b SHA-1: f4198912455b2024648e2058f81d1eac495db294 SHA-256: e1a8b683ddb82b096440efcf1afaa063e20b2e30955ddb64dda7e1821829d819
154 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple compromised WordPress sites, indicating an attempt to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. The document's structure and numerous external links are characteristic of a phishing lure designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6691

Heuristics 5

  • 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
  • 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://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/e4d162890896e36a60cca04fbef4ade8/jepojuwijinexokavufar.pdf In PDF document text
    • http://tunesistudio.eu/userfiles/files/napabokuwo.pdfIn PDF document text
    • https://bcm.es/files/galeria/files/jufekikolexasemola.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/jimuxuxipovidala.pdfIn PDF document text
    • http://debseven.net/UserFiles/File/kizegudoxex.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/vogezejaratumaxonezatizas.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/5f048afca2b03df15dfeb038670b44d2/puvaxazagamaj.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/045282pmutsdb2qntg2ufmojk8/85927601914.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16075d667ee348---garitufituvorativotafu.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/48a6844a035ca4acbf5c0ebd1bc129ef/40656379378.pdfIn PDF document text
    • http://richwoods1969.com/clients/861079/File/75075773071.pdfIn PDF document text
    • http://nguyenthaotech.com/upload/files/neruvawudakajit.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/cad9mdlqnqks6vkuf4bs9u2c3a/55728697025.pdfIn PDF document text
    • http://worldofpacifiers.com/editor_uploads/system/files/zirib.pdfIn PDF document text
    • https://semineebrasov.ro/printuri-fi/files/86286124514.pdfIn PDF document text
    • http://homelife-superstars.com/image/files/82087882853.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/9c5c6d5b1ab4ee09b7c07cd20118daf5/favapijenupiz.pdfIn PDF document text
    • https://nanosoft.mn/images/content/File/57740137069.pdfIn PDF document text
    • https://biogenetixpharma.com/ci/userfiles/files/20168612616.pdfIn PDF document text
    • https://thinhtienjsc.vn/images/news/files/55337672397.pdfIn PDF document text
    • http://studiofranzoni.eu/userfiles/files/fixapajal.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c6271c351ce---8072837055.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/55382121691.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=multiple+choice+test+answer+sheet+makerPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED0C 17248 bytes
SHA-256: 2ccf256b1f7c143283f153c01d61899823d7be84232ce4f7fffd816ede48ccba

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