Malicious PDF — malware analysis report

Static analysis result for SHA-256 73e5587a5c862053…

MALICIOUS

PDF

60.5 KB Created: 2021-08-16 22:05:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 795d816899d449c004b647bafeb0a398 SHA-1: 4e9c29e2956c688662f447ff944418d2b99d561e SHA-256: 73e5587a5c862053056425754de592fd34b3944fa0c6622459472662431a9696
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of external links and the PDF structure point towards a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9719

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 http://colafranceschi.it/userfiles/files/ribubitinoviwiso.pdf In PDF document text
    • https://hexema.com/FCKeditor/file/zenaxuvoduk.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/vuzefizasenitinisijefurow.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/dda8fa1cf5c450abb1c741114b12ebbd/gapiruninufubova.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff2a1e3430---tuxaditatogedimabamena.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/b656326f3ddf3ccf21bebb97b867bd5f/21995761872.pdfIn PDF document text
    • http://speckletrack.com/update/editor/file/71066458020.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/b8e3c9452747b7a554161acf4d032e18/54880307756.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/64116980705.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/6870664496ace9e7ba4ebdd08878070b/fesawobun.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/68552849619.pdfIn PDF document text
    • http://yilip.net/userData/board/file/74530124190.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/wogiruk.pdfIn PDF document text
    • http://amy-tsai.com/images_express/userfiles/files/18006885735.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c6201bf3b---tefezatijaxemuvakojozila.pdfIn PDF document text
    • http://iwishop.hu/file/pogafakubuvosag.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/sixesofapa.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/479add54509ed85161a215aa8daa777e/15864207812.pdfIn PDF document text
    • https://apotekatia.ba/fajlovi/54498264382.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f357e3370---74997679357.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a6aa06738a9---xovofuzofunogepuseziza.pdfIn PDF document text
    • http://haisushitogo.com/uploads/files/11683463706.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=libro+de+matem%C3%A1ticas+de+primer+grado+contestadoPDF link annotation

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