Malicious PDF — malware analysis report

Static analysis result for SHA-256 de6b1153dd608d0e…

MALICIOUS

PDF

89.4 KB Created: 2021-07-26 10:57:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8af8f5989f1d669fb591eef363a35af5 SHA-1: a82a6738793ee63d05c75ea5e814431c06a3be30 SHA-256: de6b1153dd608d0e9da846d7d3d04b4e8e85943d66f812379b2c92c7d79898e2
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, directing users to numerous external URLs, some of which are hosted on compromised CMS upload storage. The primary attack pattern observed is the use of a link farm to direct users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://adria-ex.com/images/blog//file/17100996525.pdf In PDF document text
    • http://www.lebedosapartotel.com/data/yukle/files/mifababuxosokerodamuziko.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/vosds5f9qp0j72pi3onrbo1ee2/duwivavadofatapatovop.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/r5cpt38bfgurvh8tgmsih4q4t7/67825156719.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/2d2461dfd7cbb065fb8a7243793c4cca/lafejufubimodipewakewugum.pdfIn PDF document text
    • http://landonintergroup.com/ckfinder/userfiles/files/gibazujadawegidemawibibu.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/8d4db0fe9df13676cf677eb13d80962d/bubolikonowabulu.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160894325abb41---75752453165.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/669ec9e2084c60f2c32c7555f4719bd1/24718505737.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/8abfeb4d35dee0366b329cae6e986a74/kuruzofimutupamokawaxura.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/82510125718.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210612091055.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/3049e1e5b14c10fb08e4244ef1da58f4/wafavojivujiwiduximabija.pdfIn PDF document text
    • http://immobilieninvestors.eu/userfiles/file/fapotapefuponuvakisavuxit.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/kak4og6njrm6dm1ft2549rm68v/64694347482.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/ab63e8cb4bb5ff6527becd08b2b1cfac/21701480523.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608687afab1e0---gakarufigox.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a51ab451392---mekav.pdfIn PDF document text
    • http://liddellgaryfamily.com/clients/863293/File/86057578413.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/12128420875.pdfIn PDF document text
    • https://papiratisk.cz/soubory/bipilo.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/bac66477e6094fac46c917f01b2717be/gozukijenidimeritura.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/5b8387d191db7faaff920dc9cc85143e/35664636203.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160721d3ce12e6---rujepisigozavovotap.pdfIn PDF document text
    • http://fontanarosaserigrafia.it/userfiles/file/49315084137.pdfIn PDF document text
    • https://mehreganimaging.com/images/upload/files/koxujekerilepipuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=what+are+the+qualities+of+a+good+team+memberPDF 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_off0000f917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF917 17192 bytes
SHA-256: ce923adf9ce129e9ddfbf737448c1b403bf8873bf13cd2c7536dc58f3c401f1e
font_01_sfnt_off000125ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125AC 11076 bytes
SHA-256: 2cabbd55a5f720670e8ffcf98c0c85f85bdd7c157ce8712ef5c9f212bafe1ab8
font_02_sfnt_off00013f02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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