Malicious PDF — malware analysis report

Static analysis result for SHA-256 07a54f03ca77a4b6…

MALICIOUS

PDF

63.6 KB Created: 2021-09-18 04:28:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 539b755074e0aad7a7cc102f215ca921 SHA-1: 9dc1ca8d39841c8f9498b12b598e4f2ded02286b SHA-256: 07a54f03ca77a4b6f495d630b2f0a8f0fe0c53df0b8fab0b23425c27df6c6b38
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a phishing or malware distribution intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to deliver malicious payloads or redirect to phishing sites.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4045

Heuristics 5

  • 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.
  • 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://coretry.ru/uplcv?utm_term=convert+hex+to+bcd PDF link annotation
    • https://hunghiephuylog.com/upload/files/sawekozusesegavuv.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/161338dae1675d---4995949975.pdfIn PDF document text
    • https://www.tamilsaga.com/ckfinder/userfiles/files/vebanewowutonuz.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/11362976468.pdfIn PDF document text
    • http://good163.cn/Uploadfiles/files/janaxe.pdfIn PDF document text
    • https://thediamangroup.com/_images/files/piselobasopusepimesikof.pdfIn PDF document text
    • http://www.prctech-th.com/ckfinder/userfiles/files/33279580451.pdfIn PDF document text
    • http://www.og2c.com/images/file/90083200648.pdfIn PDF document text
    • https://educationindiajournal.org/ckfinder/userfiles/files/67046253418.pdfIn PDF document text
    • https://mama-light.net/business_school/uploads/file/33425261742.pdfIn PDF document text
    • https://www.opsclown.it/ckfinder/userfiles/files/51640780495.pdfIn PDF document text
    • https://xnkvinatimex.com/uploads/files/fomivujoxepeme.pdfIn PDF document text
    • https://minhgianggroup.vn/upload/files/nejave.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/17195017481.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/31201175358.pdfIn PDF document text
    • http://solarwindependence.com/ckfinder/userfiles/files/5498660651.pdfIn PDF document text
    • http://ortopediaszombathely.hu/editor_up/renilukaxulagubedubas.pdfIn PDF document text
    • http://ms-beauty.com/ckfinder/userfiles/files/60335623477.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/161418ef41c07a---zitibusoweguwejavefijexom.pdfIn PDF document text
    • http://rudolphi.nu/userfiles/file/saroxofinogelafekir.pdfIn PDF document text
    • http://ziva-muzika.cz/files/file/nogasenotezudupozi.pdfIn PDF document text
    • http://profstil.az/userfiles/file/83407113564.pdfIn PDF document text
    • http://lerucherdesanges.fr/userfiles/file/72766897945.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/54767740198.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/41088946193.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139f6b154236---kosiwe.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bfd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d7ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7EA 10340 bytes
SHA-256: 12916eafdb4e8f0f67f73fa51b864f976a765df5c2bcf9c3a9fa36e52832d7ba