Malicious PDF — malware analysis report

Static analysis result for SHA-256 f531a32b4148917f…

MALICIOUS

PDF

98.2 KB Created: 2021-08-21 05:30:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: bc5ccce004b961f63300dbe9f5957b32 SHA-1: 179cfdb7d0d884bcb6470080f09e2e8711f2719d SHA-256: f531a32b4148917fd4a0feeb7bd72946cee3cddecf11205c73e1e7c8d8f91118
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a PDF link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting it's designed to redirect users to malicious sites. The embedded URLs and the nature of the heuristics strongly indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 6

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://upchealth.net/wp-content/plugins/super-forms/uploads/php/files/d6c72e604fffaa0570bc1b455df1cfbb/39750336515.pdf In PDF document text
    • http://saltokisport.com/uploads/files/72373803453.pdfIn PDF document text
    • http://waterreducer.cn/d/files/21454733898.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b637c15a29d---85182874749.pdfIn PDF document text
    • https://ozsersogutma.com/upload/files/82007495511.pdfIn PDF document text
    • http://vom-ragnaroek.de/uploads/file/14710696850.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/kuvorax.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/9787221079.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9c214014f---201103454.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609d765179b68---88582485531.pdfIn PDF document text
    • http://vanguardhungary.hu/userfiles/file/jivoza.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/31099a48cf36f191858d01918d2ee4b1/33774783723.pdfIn PDF document text
    • https://www.verimevzabavu.cz/ckfinder/userfiles/files/318991909.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/160974775a8d54---sabuwiwamuxuturiv.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/b1c821074c1f90f6d0f337afe746c0cd/nodasimawajefo.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cad2a897df---86053277808.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2cd20b3ec---rodatize.pdfIn PDF document text
    • https://advik.net/userfiles/file/dekivapozuvur.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ccfeb3980---17333087220.pdfIn PDF document text
    • http://ebsenglish.net/_UploadFile/Images/file/71850481928.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/71104369643.pdfIn PDF document text
    • https://www.hippocratio.gr/ckfinder/userfiles/files/96862616836.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b65845c31ab---vupuvitetuzumuwugabofa.pdfIn PDF document text
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee2632d87c---83727943998.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=ejemplo+de+ensayo+de+comparaci%C3%B3n+y+contrastePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001178a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1178A 18568 bytes
SHA-256: 082fb1b60e74a8bdd31f4f7e4cddfc2c5e3bf3e9b04338a80d3dede698c7a557
font_01_sfnt_off00014669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14669 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015e80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E80 11040 bytes
SHA-256: 09cbffe51b924a5acb6d40a719ff697953b6a97c7773bcfd30b10aba1a5feb75

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