Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad7791e2b26ce5dc…

MALICIOUS

PDF

61.4 KB Created: 2021-09-08 21:27:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: db7ee673c21ae5fef1183c823c70d758 SHA-1: 82092ca0f84c8d05acb422f1c7d944fbf96cc6de SHA-256: ad7791e2b26ce5dc8f53edd343ae27a272fa71ff1d8cec59467b28f73da180c0
94 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to potentially compromised websites and disposable domains, indicating a phishing or malware distribution attempt. The ML classifier strongly flagged this PDF as malicious, and heuristics identified it as a link farm on compromised CMS uploads and disposable hosting. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8923

Heuristics 4

  • 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 http://adhdesign.de/userContent/files/20210903161939-91585116306.pdf In PDF document text
    • https://spcinternational.in/ckfinder/userfiles/files/35188236461.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/6aa6b5d4b6fd386c8aa8322930eef557/89067534899.pdfIn PDF document text
    • http://gilendor.cz/userfiles/file/90070927797.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136103f8dd27---87959949465.pdfIn PDF document text
    • http://bkmarine.net/ckfinder/userfiles/files/1630520053.pdfIn PDF document text
    • http://1yunnan.com/ckfinder/userfiles/files/63748522268.pdfIn PDF document text
    • http://jianianhuayule.a9188.com/upload_files/art_files/files/20210902_101855.pdfIn PDF document text
    • https://organicearthfiji.com/documents/file/48134614635.pdfIn PDF document text
    • http://orvositudasbazis.eu/images/upload/file/91141484413.pdfIn PDF document text
    • http://fra2ange.it/userfiles/files/69071462051.pdfIn PDF document text
    • http://35ju.21tg.cn/uploadfile/ckeditor/files/52727643265.pdfIn PDF document text
    • https://alshuka.ps/ckfinder/userfiles/files/fipigarig.pdfIn PDF document text
    • http://njbeihang.com/uploadfile/file///2021090112162882.pdfIn PDF document text
    • http://win-sonic.com/ck_imgs/files/meremomozilutigujijeri.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613807666fe34---wapeviwige.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/23913767056.pdfIn PDF document text
    • https://stradatextiles.com/upload/ckfinder/files/10040810665.pdfIn PDF document text
    • https://porfic.com/fotos/file/14372401975.pdfIn PDF document text
    • https://www.funes.gob.ar/ckfinder/userfiles/files/gawivagevibin.pdfIn PDF document text
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_06_20_46_23_4450.pdfIn PDF document text
    • http://ildongwire.com/userfiles/file/sotirowas.pdfIn PDF document text
    • http://halanmilk.com/upload/files/79136054595.pdfIn PDF document text
    • http://one9five.com/userfiles/files/75777780950.pdfIn PDF document text
    • http://esangsok.com/upfile/files/paxurebi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=laws+of+human+nature+by+robert+greene+pdfPDF link annotation

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