Malicious PDF — malware analysis report

Static analysis result for SHA-256 97710e8b5c3235f2…

MALICIOUS

PDF

77.5 KB Created: 2021-06-22 16:30:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: ff9a100975835c8cdd48ca437fbd65ef SHA-1: 08836918144dd7d1e6aea4969537e499cad0f43c SHA-256: 97710e8b5c3235f2f155283602ff416c6d8b2b38c4d65724474768d8b0ce730a
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it is designed to exploit vulnerabilities or lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • 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://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/50c26900666c84d67335ac48cdbcff8d/ranopiwotenogizu.pdf In PDF document text
    • https://anmoul.com/userfiles/file/witazubog.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/46159630929.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/podatile.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/5108335990.pdfIn PDF document text
    • https://trellisdundee.com/wp-content/plugins/super-forms/uploads/php/files/047df4d235ea54222fcf62e3c51c5b7a/nikudoletuvixemafanupo.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8daae5a7c---33242740484.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/57c49780e67070bcccb0c543485362f1/64265110418.pdfIn PDF document text
    • http://africa-emergence2019.com/userfiles/file/dakekutulivuser.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/fezasofe.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/lewuxozamowukomamuvi.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/7l4d4ieb5fm2t7pkdm0s7lllf7/37167909628.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/5fc61d6134f676df0a52e31c39daea90/76840256897.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0290bb155f---94520579818.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160738320f0de2---50196171332.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/fifevileli.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=birds+modern+insurance+law+pdfPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B9 5244 bytes
SHA-256: 2b47badc7ca1ae762278a58349a7374a829433ce77b340ddff4d83d026622bcb
font_01_sfnt_off0000f679.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF679 10632 bytes
SHA-256: 55bc2b2cccc669759219d7da2738f71d2fbbadc25442a867a53ad2f0e21fa3f7
font_02_sfnt_off00011a9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A9F 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e