Malicious PDF — malware analysis report

Static analysis result for SHA-256 b64f62c83fefeaaa…

MALICIOUS

PDF

62.3 KB Created: 2021-09-05 22:12:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1ddbfe3418bb919ba765dbbb643185f9 SHA-1: 07f69eb67524237d06b20097aaa15d37adddcfe6 SHA-256: b64f62c83fefeaaa95b46bbd5b2e412c484672451d9e8f77f82b68526ef3cd2b
154 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple external URLs, many hosted on compromised WordPress sites or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7898

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://rippa.pt/files/file/kizasotulasoteluzuxorifuj.pdf In PDF document text
    • https://fwullong.com/upfiles/editor/files/wirofusepufuru.pdfIn PDF document text
    • http://www.humillacionyestrella.org/ckfinder/userfiles/files/waneg.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/lufedinor.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b98581581b0---12586468556.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160f0e6908f0bf---38361937594.pdfIn PDF document text
    • https://glycocalyx.nl/userfiles/image/file/89358715384.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134d88393470---64328872379.pdfIn PDF document text
    • https://seger.cz/userfiles/file/23307516661.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160e230756481c---94610674048.pdfIn PDF document text
    • http://vejwun.cz/images/47925106613.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/7458339158.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/c4a6f69650ee95b247f8cd48360a9d0d/tagovusi.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/19182466430.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/85021499641.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/56797165553.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/no4kb8d4ctb9llo8jqdhr4ifa6/xajomiguw.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160cb8e6cdcf05---77353055043.pdfIn PDF document text
    • https://psychotherapie-coeppicus.ch/userfiles/files/69080981552.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/16076bb3659343---zudikibefife.pdfIn PDF document text
    • http://18554080.com/userfiles/file/kavezi.pdfIn PDF document text
    • http://iccarrentals.com/files/file/norizasixakoxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=fountas+and+pinnell+running+record+pdfPDF link annotation
    • 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_off0000ca68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA68 17892 bytes
SHA-256: 51574df5907d531242f7ec10cb8d2da8a6587d2b6c331047657bccbd6693c00a

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