Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad3dc7a3c11f9053…

MALICIOUS

PDF

64.1 KB Created: 2021-06-14 01:33:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: fa094d3e1c23515bbb4a44fd5ee6b175 SHA-1: 67c0001fdd7700c6a49d2ff1b90d0e9e8103f378 SHA-256: ad3dc7a3c11f9053a8790fe3602269b8a5564c08113eaf722c3d18dc47b7ed61
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a link farm or phishing lure. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, pointing towards attempts to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9745

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 https://ketchas.ru/uplcv?utm_term=escala+de+sedacion+de+ramsay+pdf PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160838db8f3cbc---24266989998.pdfIn PDF document text
    • https://ivanamihic.com//files/24866653800.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160768d6920bd7---zuxalaxigoz.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/7f160e129dc188c665f155ab1b027c06/kivuwerazijaradijixilatab.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/70554303160.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd62daadc0---taragezawe.pdfIn PDF document text
    • http://kentcliffordreunion.com/clients/a/aa/aa84b18e55fac3ff3c25336c5005d9e5/File/12686677103.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/7993447976093176d1d4da.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160807f15e4e8d---gagarozufuwufevesukagudi.pdfIn PDF document text
    • https://daleel.global/wp-content/plugins/super-forms/uploads/php/files/am9qcr7eokk6gfuev16ah76fvo/zavaxezimaj.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/7ba0552e4868165225a0106e64eabaf4/mufulujuruk.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/nors16luh3qabec028gm6ikog7/98190447207.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/8410224345.pdfIn PDF document text
    • http://stromzeleny.cz/file/39689529136.pdfIn PDF document text
    • http://goodtraefarm.com/ckupload/files/nobijerufagasuzugafevow.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_off0000e4df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4DF 5360 bytes
SHA-256: 7731403c5c5c54e5bf4fc9d212a7a9cbb26bf580f888619031063aa35c5c811b

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