Malicious PDF — malware analysis report

Static analysis result for SHA-256 20b712431e8f80a1…

MALICIOUS

PDF

65.1 KB Created: 2021-09-06 10:56:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4ebf5a6bcb49fd3b67ec147b93007406 SHA-1: 93055ae4f3b9e7c91bfaf75c148e2aa5d4ca5e18 SHA-256: 20b712431e8f80a16ccaf207c761314a5b605521bedc3f61ddeec431af7263eb
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting domains, indicating a link farm designed to manipulate search engine results or lead users to malicious content. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious, supporting the assessment of a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9460

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://niboparis.com/upload/fckeditor/files/vizadewejimatovadojumi.pdf In PDF document text
    • https://dialogueinpraxis.net/files/docs/melugobo.pdfIn PDF document text
    • http://tsrmvolontari.it/userfiles/files/warafajikobirepuk.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/nuxolire.pdfIn PDF document text
    • http://ulv-fogger.es/d/files/lejoxejutixe.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/binix.pdfIn PDF document text
    • https://mystruggle.uk/indigo/ckfinder/userfiles/files/50627092358.pdfIn PDF document text
    • http://phuocthuan.vn/images/pic/file/bobamedatas.pdfIn PDF document text
    • https://zenkenmoshi.info/images/files/file/86574164369.pdfIn PDF document text
    • http://brightwayconsultancyservices.com/userfiles/file/lagitijaloma.pdfIn PDF document text
    • http://ueros.fr/admin/ckfinder/userfiles/files/muzolubomizabuwari.pdfIn PDF document text
    • https://manajrgvaaradhi.com/cms-uploads/files/mojipavemu.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6e2b78156---9025215440.pdfIn PDF document text
    • https://et-auditing.com/userfiles/files/53420049995.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/65079007fc4f59655a903b2e6dcd990c/pesusuj.pdfIn PDF document text
    • http://lngpetro.com/userfiles/file/1070647180.pdfIn PDF document text
    • https://locktactyuma.com/userfiles/file/5069887934.pdfIn PDF document text
    • https://outsourcedbackoffice.co.uk/wp-content/plugins/super-forms/uploads/php/files/37758c425154fe0fbc3a4b41336cc2a3/jebowufabozaposos.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/josinemepoto.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd1e0a80405---36246124715.pdfIn PDF document text
    • http://netmode.net/app/webroot/uploads/files/jalevadewek.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/fuzikileruxop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=materi+usaha+dan+energi+kelas+8+pdfPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/347ff8ca84a86dd24e395adcec19f075/gejuwopajugujuvebepel.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_off0000d8fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8FE 17252 bytes
SHA-256: 670478f2cb9af05e78450bd39782f3dd3ff6a2d77e4c92e51ec13af5f827e21c

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