Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ffa34d7c861bbdb…

MALICIOUS

PDF

51.1 KB Created: 2021-09-29 14:22:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b0825bc1074a48db3e1defa67ee4c4cd SHA-1: 147b2f43a4abf1864f3e87893cff53019c963afc SHA-256: 1ffa34d7c861bbdb3bcfa570aedd2c59c467f509392ffa0637bcdf16f173d4c8
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the links and the PDF structure point towards an attempt to exploit users via malicious redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7009

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.spitalmoldovanoua.ro/ckfinder/userfiles/files/82752163926.pdf In PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/ea7c1409c2cb749ad9d18a3d5c0767c1/vewabiwijosemiz.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/27508652548.pdfIn PDF document text
    • https://sanghvicranes.com/staging/media/vixutorebur.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/75398472009.pdfIn PDF document text
    • http://ssatripoli.org/userfiles/file/79558688815.pdfIn PDF document text
    • http://taispacedesign.com/upload/files/43727042088.pdfIn PDF document text
    • https://tectrongim.com/uploads/file/dejunimav.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ccfcbdb606---pamaxulimelozigajo.pdfIn PDF document text
    • http://octapus.vn/images/uploads/files/kiloxegemizimozapariwa.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/18407488291.pdfIn PDF document text
    • http://www.ekoforte.com/upload/file/nonewonunevu.pdfIn PDF document text
    • http://waxiangyuan.com/upload_fck/file/2021-9-6/20210906092210218308.pdfIn PDF document text
    • http://moskvaznaet.ru/upload/files/82882897989.pdfIn PDF document text
    • https://tessuno.com/upload/files/6141ffca6edef.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/161369e3b5392b---lopetifoxozigonutug.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/juxorapewepirimekewiwujo.pdfIn PDF document text
    • http://geomanteia.com/userfiles/files/vedalofina.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16147eeb7f1758---78059031287.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/78128007507.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=grow+old+with+you+lyrics+juan+karlosPDF link annotation

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