Malicious PDF — malware analysis report

Static analysis result for SHA-256 35d46f06bd3d17ef…

MALICIOUS

PDF

55.8 KB Created: 2021-06-20 17:17:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 6abd506b829b3d2931a0952ae0a5398e SHA-1: 8fedc65efb9574cafabb92c6c40aa1ff91c2da33 SHA-256: 35d46f06bd3d17efdbfa5f1ddb485d72b673bf9092eea0105399660e08cc0059
94 Risk Score

Malware Insights

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

This PDF document utilizes a link farm hosted on compromised WordPress sites to distribute malicious files. The document body contains a fake error message, 'Your pc ran into a problem and needs to restart irql not less or equal', likely intended to trick users into clicking the embedded links. The ML classifier strongly indicated maliciousness, and the presence of multiple links to potentially compromised CMS uploads supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8067

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://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/55689ea0de1ab41c93cfb16d57945a64/21059093049.pdf In PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af97e4c5c08---vimobupiselovojobuxen.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160906741ba6d7---mejatokokoralapobe.pdfIn PDF document text
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/qkttq15ae0ti84lota2er4d3kp/88535018493.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/96011536168.pdfIn PDF document text
    • https://luminex.pl/upload/file/vuved.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160969c1c498bd---feveluwosak.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608304aeae2ea---43200913961.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/47205960887.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160861cfd06f7e---fakiragomusuwitadopikevoz.pdfIn PDF document text
    • http://reinforcingourheritage.com/clients/0/08/0860c2a235168fe7e4a745c824023bdd/File/sigibexenolebusegepuro.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab6eecdeb55---96965922510.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/731c0971a598fbf4aa5b4f19eec869de/84642740473.pdfIn PDF document text
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/80493888837.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=your+pc+ran+into+a+problem+and+needs+to+restart+irql+not+less+or+equalPDF link annotation
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB4 5448 bytes
SHA-256: 3c978a0e3806a31c4857f0237031267e5964392398df23ba93314e4bcaeaa34b

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