Malicious PDF — malware analysis report

Static analysis result for SHA-256 d93d88ff03224545…

MALICIOUS

PDF

82.3 KB Created: 2021-08-18 16:36:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6d16b5688711915b97bd65859a2f2ee6 SHA-1: 80c4d8b6f5eedd2955f89bafaead39b2c8d89eb9 SHA-256: d93d88ff03224545c6780e1b6253532661b961eb030a5fabfc6d9b8898305002
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress uploads and other disposable hosting sites. The primary purpose appears to be redirecting users to potentially harmful content or facilitating SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 http://ugrctrani.it/userfiles/files/78229023122.pdf In PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/0kocnnjj1v6m7bnhltjnr8ahhp/divafumovipodit.pdfIn PDF document text
    • http://eastcity.hu/ufiles/file/60217429489.pdfIn PDF document text
    • https://renebeumer.nl/userfiles/file/witinavuxulub.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/bbuuu40lqhk6dm2lmje5r8en97/fasilomifovobato.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160ab53ffa08ea---42613770819.pdfIn PDF document text
    • http://artpolinakuzina.ru/pict/file/46419972694.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6acb3e32cc---winenedukutoramoxi.pdfIn PDF document text
    • https://paidionresearch.com/userfiles/files/20095399306.pdfIn PDF document text
    • https://frontivo.ro/userfiles/file/bipagonilixaxikeliteperol.pdfIn PDF document text
    • http://citra.cl/userfiles/file/fonuzopofajone.pdfIn PDF document text
    • http://85560891.com/upfolder/e/files/20210714135543.pdfIn PDF document text
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tesefuvalitikamowamobud.pdfIn PDF document text
    • http://atsrealtyvietnam.com/upload/files/46082679599.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/xofepinejupax.pdfIn PDF document text
    • http://immobilieninvestors.eu/userfiles/file/gojazivitewedufuvofived.pdfIn PDF document text
    • https://b2b-intelligence.it/uploads/file/99635446170.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1611bfe61b96c5---70100205680.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a12bf1d9125---vipare.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/febc67186ceb2c9f7980bbed6e785c01/tisusinu.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/a9d444a0d3ea4ccf748c73693b6d4390/nafekuwugogutof.pdfIn PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0619/0f5450029ab40dd00635e3239651b26e.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=abs+workout+chart+step+by+step+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://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_off0000de4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE4A 16696 bytes
SHA-256: e7e72f351ce24b10af8b7eed67b6e1e55e96f2b1f2e81a469eec4377ecd411f1
font_01_sfnt_off00010950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10950 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12167 10988 bytes
SHA-256: 5ec0a815f1eda1c11bc66a1339950ac79ba13d71fdfcf02098c8616421b3b614

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