Malicious PDF — malware analysis report

Static analysis result for SHA-256 7eb2b23360065d29…

MALICIOUS

PDF

53.5 KB Created: 2021-09-24 20:06:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4dde5f667c3655a97b81eb078e084fef SHA-1: f720e1daf196550b76c08f2eb83b730892c1116b SHA-256: 7eb2b23360065d293b2b6f3f46db8e3e3245e7d3b915b29ae8dbfa6534c4b50f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, potentially leveraging PDF's scripting capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8655

Heuristics 5

  • 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
  • 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://archism.ru/uplcv?utm_term=my+hero+academia+season+2+episode+16+english PDF link annotation
    • https://karlholmbygg.se/UserFiles/files/13263847916.pdfIn PDF document text
    • https://profm.hu/files/file/jupoderezi.pdfIn PDF document text
    • http://sevennews.com.br/ckfinder/userfiles/files/xawufiseja.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/wikepanowimoberaje.pdfIn PDF document text
    • http://kag.fr/userfiles/file/99146420642.pdfIn PDF document text
    • http://fongyoskert.hu/userfiles/files/xebazawaxele.pdfIn PDF document text
    • http://pierrevillers.fr/mairie_files/file/dukidigofevoresukuwar.pdfIn PDF document text
    • http://lctrading-gmbh.com/ckfinder/userfiles/files/fogaz.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161393ac2611c4---30783131877.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/zodarerad.pdfIn PDF document text
    • http://dealershop.es/userfiles/file/57704395406.pdfIn PDF document text
    • http://pharmorgsyn.com/upload/files/26156984733.pdfIn PDF document text
    • https://pgp-puh.hr/fck_media/file/57506957952.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/misatesaninomovom.pdfIn PDF document text
    • http://md-servicios.com/userfiles/file/jipomari.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1614ad53035e91---tosakiwonivelo.pdfIn PDF document text
    • http://steinemann-ag.ru/rovuwefewuramifup.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/eabde5b6e307b04fcb4c3a24a5689468/22246089203.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149984cdd8d7---65587270771.pdfIn PDF document text
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/galoxakejowawej.pdfIn PDF document text
    • https://oz.korytnica.eu/data/files/wugejozaluxixako.pdfIn PDF document text
    • https://chaletsuenodesol.de/files/88747136754.pdfIn PDF document text
    • http://bualuang101.com/backoffice/upload/files/fugisanepoxefutameb.pdfIn PDF document text
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/b62dca599e640f179a70a1e877456186/4163719041.pdfIn PDF document text
    • https://vivekanandbawwa.com/userfiles/file/lonuf.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB511 11308 bytes
SHA-256: 941a8e1b89663e912642c718fffb1b67b7b81913d25fe4dd5cfb0bf9f984fe32

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