Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6137c37fc32f8cc…

MALICIOUS

PDF

103.2 KB Created: 2021-09-07 03:45:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f6dbcf141db94f22a3b861cb5385774f SHA-1: 2cee41f8103e15be99f4ebe46db105665135c6eb SHA-256: e6137c37fc32f8cc3881f34063b672a0a98433407e6c56071e2e777331241a7e
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, lacking clear user-facing text but containing structural elements indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://laborke.ru/uplcv?utm_term=indicadores+de+calidad+en+alimentos+pdf PDF link annotation
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/3f619bpjqmr3mnh214bosq7c9t/31692339420.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fad35c364b4---jubavesemidobanofami.pdfIn PDF document text
    • http://michardardillier.com/ckfinder/userfiles/files/zoxapinusarexotavor.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/480389e18490700ce24d1aaec7275fbf/xawifumokefenizisix.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1284467cd3---pepif.pdfIn PDF document text
    • https://frigosztufi.ro/ckfinder/userfiles/files/befevazarasagilujedajuvom.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/dogidajitixorefozudazesa.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607604fa9e9f4---kojubapi.pdfIn PDF document text
    • https://badanie-wody.pl/galeria/file/56768887368.pdfIn PDF document text
    • http://billsky.ee/files/file/suditaligubef.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/gesejug.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/oiafho0gveru2k3rircc1hgp6n/relarudojo.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ab34876958a---11147512369.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/f09ffd111ffcf2b1228d3e1349875e73/34776247547.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/381d9e52f1746ed7ba56881e0b127f43/27428484380.pdfIn PDF document text
    • http://tamlaproject.com/userData/board/file/49850072275.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f2ac728c521---lapubobiz.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16094882c3000a---17989142206.pdfIn PDF document text
    • http://campingwithconvenience.com/files/files/buwoganifisobobevubasuk.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607973c17b92c---nunufowafod.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/vm8vvnml72em0sj1p7qgt1rv6b/debalimo.pdfIn PDF document text
    • http://halaljones.com/uploads/files/46187776484.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/4a1mqbhq690bvm64mr3mg1598s/80528143627.pdfIn PDF document text
    • 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_off0001293e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1293E 20016 bytes
SHA-256: aa0eec46e193195b685a26b70bba832b39f48eb53fb90898d5e70bc4a614a4ff
font_01_sfnt_off00015c4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C4A 10732 bytes
SHA-256: 734c0ae780d9d8199e9fd385d95693515664395ecaf9e0d41adbb119ca95d712
font_02_sfnt_off000174eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x174EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.