Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b664fc9f74568b6…

MALICIOUS

PDF

62.7 KB Created: 2021-06-06 00:18:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b69ec81d8aafdd289836c7aca112e133 SHA-1: 36da45d5af5054971d1f28e97e11279b65cb3ff5 SHA-256: 4b664fc9f74568b62974995337cfcea0a35cd5a20d06b918556d25e37ecaa6d1
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external URIs, many of which point to compromised WordPress sites or disposable hosting. This suggests the document is primarily functioning as a link farm, likely for SEO manipulation or to distribute further malicious content. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9841

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 https://chcial.ru/uplcv?utm_term=derecho+romano+marta+morineau+iduarte+pdf+gratis PDF link annotation
    • http://pivotal-technologies.com/userfiles/file/64380635327.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba1efda037---2871865884.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/62332b335d50fc4109a6d7daee4cdf23/wobodebejuvegijulejed.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef4675214d---92711784671.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/504754c7b0c8fd5d15a26516b5e8dd2f/ribosadenepudubegugodav.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/16073ef5d9de31---32532497593.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160825b42e4ecf---9876109284.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/30193564514.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5a3ea7afe---xezezukozigamigazate.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/49179911949.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607e17192b04e---gagigasisalame.pdfIn PDF document text
    • http://gtshotel.it/images/file/ratowi.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/vixemarafipuvovozenowi.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b67e83f1440---16892980101.pdfIn PDF document text
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/3df20e0e9f393fd3f4f6f39263434215/1456835571.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/gipurawovugobugan.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16094d0b226534---ladofat.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/b18932b9c65aa231639178b08e78e905/65516503570.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/zuxekezem.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070232fda419---64148698923.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F7 5416 bytes
SHA-256: 579f0c9784c06847217b1489738ea4d6faac42a9f1dafb3cd7b10dc6090e1990

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