Malicious PDF — malware analysis report

Static analysis result for SHA-256 37a635b817e8f828…

MALICIOUS

PDF

54.0 KB Created: 2021-06-21 10:02:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: ffc2bbfa61f273446650880ebfa8731e SHA-1: cfea60fe34e39a5994fa21ebec113551496585d3 SHA-256: 37a635b817e8f828bed0576168b42ce8a8dca18965b7fc7e9b6d06242d957d76
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating it functions as a link farm. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The embedded URLs are the primary indicators of compromise, directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9536

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 http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608a6e08e9988---7562799407.pdf In PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/mr81ag5kv0fdmnnnu3n4tv2ga6/laragobuguzavagi.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160739ed9a2333---9617133050.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/mazixegaw.pdfIn PDF document text
    • http://psychoterapia-przemysl.net/img/userfiles/file/figidiporowofunitemijo.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/s2nen5pcbhh9oe61g2hjkbuo7d/jumovarutogegav.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/12246175586096d1f19f765.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/16090dd14ed9f3---gisawozifal.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608718fa6bf8c---kiraze.pdfIn PDF document text
    • http://usmleworkout.com/files/file/58016732573.pdfIn PDF document text
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/dih71p5jl6rv90nhbgn3if6tgs/87737523912.pdfIn PDF document text
    • https://triosms.com/userfiles/file/84411716864.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/jqbc8a0cmv1lt8ro1215816q68/wixutekamapavefa.pdfIn PDF document text
    • http://capitolmetrophysicaltherapy.com/userfiles/file/zoguxumejo.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/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=die+die+die+my+darling+misfitsPDF 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_off0000be70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE70 5328 bytes
SHA-256: f6b17aae8acd6c98666d86fb77d5e0a69e77d70a1b696c614d7d875959f5e8cf

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