Malicious PDF — malware analysis report

Static analysis result for SHA-256 5650529b393b15de…

MALICIOUS

PDF

39.6 KB Created: 2021-06-19 11:44:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: a37ecfd330b8bf9fdb320bb2a1b48f73 SHA-1: ec75e158b2c2cd6c73c823005d604a03119e69ca SHA-256: 5650529b393b15de2591299bc1c208f995c61d9528a226c7c8bd5eca8b34dcab
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF employs a common screenshot lure technique, presenting itself as a document but containing a clickable link to an external resource. The presence of numerous URLs pointing to compromised WordPress sites and disposable hosting suggests an attempt to distribute malicious content or phish for credentials. While no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious intent, likely related to a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7786

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 39 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://cructi.ru/uplcv?utm_term=11th+chemistry+book+back+answers PDF link annotation
    • https://manuscripthandler.com/userfiles/file/latepanugokijipojirunudu.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6f6a70cd1---10727274214.pdfIn PDF document text
    • http://shsalumniauditorium.org/clients/f/fa/fa32e32112b7cad64a7d7e78b95ed61b/File/fixorasix.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7d5cc2c31---49285178477.pdfIn PDF document text
    • https://ols.lighting/wp-content/plugins/super-forms/uploads/php/files/07eb88a3a2c3c6e2dc0eb8047c63128f/15223008960.pdfIn PDF document text
    • http://www.scsi.coop/wp-content/plugins/super-forms/uploads/php/files/6e05c9113f55269690f9731200741e8b/97156161794.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160c76d224c538---vetaz.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16071eba5902d1---xovoxak.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/3b92a96fa85d254d168266d4e14b3b8c/danuzejomuvusot.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609409488f7fc---puramejavujene.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/a1d3b6ba7112677e5010042b11bcbd55/5211707094.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608066074457a---kulivafixotawigodij.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/d2b9b3f592041cf61c4bf933066cde91/vesepepegugemuf.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ecea803f89---17325500649.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/110009dc65e8f0a852c05f1baa3f92ec/89247381214.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/e9cf906254959105ca0809d63894c849/31068403572.pdfIn PDF document text

Related samples 8

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