Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e129ec014d9cc16…

MALICIOUS

PDF

60.9 KB Created: 2021-09-13 03:45:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 7086d0607ca5ac9281f7c2cde2a2e114 SHA-1: b039fa58b086af5fc1d803591f35f973755546e3 SHA-256: 3e129ec014d9cc16217cc64e5fadcb87758b88e53ec922c482c74d1116e344c3
64 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to other PDF files hosted on a variety of domains. Several heuristics indicate that these are part of a link farm, with some links pointing to compromised CMS upload storage and others on disposable hosting. The primary purpose appears to be SEO manipulation or distributing further malicious content through these linked PDFs.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3255

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://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/53915306110.pdf In PDF document text
    • https://mudraconsultancy.com/uploads/files/zalobetopisami.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/14703184595.pdfIn PDF document text
    • http://free-note.kr/files/fckeditor/file/530827620613aa314b43cb.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/15395543128.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/24594478493.pdfIn PDF document text
    • http://vhktn.at/images/content/files/pupenosejesiv.pdfIn PDF document text
    • https://jin-ji.com/upload/files/55367693177.pdfIn PDF document text
    • http://fence-alarm.com/userfiles/files/fivipaxinirul.pdfIn PDF document text
    • https://lajovisena.com/gallery/file/majakasevawizusixab.pdfIn PDF document text
    • https://cebrigantina.com/025-CEB/images-editor/file/97514471387.pdfIn PDF document text
    • https://honghow.com/ckfinder/userfiles/files/78161749773.pdfIn PDF document text
    • https://ln80.cn/filespath/files/20210910203148.pdfIn PDF document text
    • https://yodishit.com/uploads/userfiles/file/29057061241.pdfIn PDF document text
    • https://sukaunited4d.vip/contents/files/71935599511.pdfIn PDF document text
    • https://www.weboonline.com/ckfinder/userfiles/files/35982246018.pdfIn PDF document text
    • http://studiomuraca.eu/userfiles/files/gemipitu.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/38590725822.pdfIn PDF document text
    • http://ergo-logo-bamberg.de/userfiles/file/vujovifagefite.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/pukupewofotapunuliw.pdfIn PDF document text
    • http://dulwichtaxi.com/survey/userfiles/files/10718396168.pdfIn PDF document text
    • http://fatfailogistics.com/fckeditor/files/file/lomogubakudesuk.pdfIn PDF document text
    • http://edilgroupdigiovanni.it/userfiles/files/96007487471.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/161321ba121ed3---kuzepixisuruvi.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136d9086ceef---85014640481.pdfIn PDF document text
    • https://nurea.se/currency/userfiles/file/falutukazuxurugugeduf.pdfIn PDF document text
    • http://ttmm.co.jp/ckfinder/userfiles/files/rutomivaf.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/h4apmooh5j9dk8sc1juoukrqk0/28141445860.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=itext+split+pdfPDF link annotation

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