Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ccd90dcad318f0d…

MALICIOUS

PDF

73.0 KB Created: 2021-04-30 22:00:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 67006ea6abfd1454799030b1c769fc33 SHA-1: dc51ce4e3787213b0f622db3943f7f43b161f298 SHA-256: 9ccd90dcad318f0d36cd4fa9d306db09fb6670a61c7d99d3c53135769a0f08d0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to compromised websites, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of PDF-specific heuristics like 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this. While no scripts were explicitly extracted, the nature of the links and the PDF format suggest potential exploitation of PDF vulnerabilities or social engineering to trick users into visiting these sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160826f0501b07---70826198615.pdf In PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1606dbf0e21cf3---14141136235.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-4-29/20210429030026570142.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160848888f0d29---xokufevuvelonu.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/96c81e7fc0afff842ee3fbba20fbf83c/detov.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/20fcac7a743a714281096d3cbddfde58/63988568123.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160793c4f61842---xivojamoza.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1608bce1d0344a---ruponegakowodowogivekegop.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/kdn3luu0lf5avg13cfkll5us96/debasaroxexila.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16082bc55d272f---99712894976.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd8cfe2594---zobukuril.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/79428484317.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8d939707b---80952485124.pdfIn PDF document text
    • https://mobistore.co.nz/wp-content/plugins/super-forms/uploads/php/files/9e17036a51570172483665681d309ed4/19710056531.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f10be01ec3---26949742283.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/68551d054abaf9a814269639daae9011/gulitotabozewajikuro.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607349143f1cf---bujibejapapawakej.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/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=textbook+of+medical+biochemistry+chatterjee+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_off0000d4e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E9 2828 bytes
SHA-256: ec0617e7d4b767a4f38c4993bdaaecdad4a8b4ca688b321d2bd370a6bc92076d
font_01_sfnt_off0000def2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF2 5792 bytes
SHA-256: 11ff22ef7f1f0f7ee29322e80b08253e501b1cb214b1a5da1f6fcfbc32437a39
font_02_sfnt_off0000f290.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF290 10344 bytes
SHA-256: a067b92584fcca3350d39fc75db343d86d2d3bccb91907c5b08816b93c8ca5a5

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