Malicious PDF — malware analysis report

Static analysis result for SHA-256 c729f6806467ee36…

MALICIOUS

PDF

66.2 KB Created: 2021-05-27 17:51:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 47ce8dfc19e5638b3941da6ed0bbbc94 SHA-1: 175c51b6681e674a2965c6e5d3f95dc6bcdd9226 SHA-256: c729f6806467ee36710fdb8289369c8878edae8bf1a60eb03f7ecc9a08df679c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links to compromised WordPress sites, suggesting it's part of a link farm or phishing campaign designed to distribute malware. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8592

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://cructi.ru/uplcv?utm_term=halfords+1800cc+diesel+battery+charger+instructions PDF link annotation
    • https://www.enterpriselighting.com/wp-content/plugins/super-forms/uploads/php/files/ea4d47f84bcd6072e4ad3c7f0ecdad10/gewurusatukuf.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608993d2e2e9a---divedujaxumowik.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f5322fa73---56972323269.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210507011044.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/07a2a48357b1c749d8eb843b9ef23f8e/11317831871.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160791ef4c090b---40418146867.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607cba91e4b0d---gadipopewaga.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/bebbdcb14370e81456213964f3c61eea/zafukepaxevifixivuzope.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160831b0a273a8---15822636982.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/460008370.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1606e3e25b2c44---pogines.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160726496b83a8---totavaperuluzi.pdfIn PDF document text
    • https://prosegik.com/wp-content/plugins/super-forms/uploads/php/files/33d0aecc89761659eacd565b59f71bd4/bezusamusapud.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/xedogifirafatonikubifuje.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1452c1e498---vuzapunuxokamidul.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/41652420691.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d2f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2F0 5876 bytes
SHA-256: dd0acba0b94e65d178ffc95e9231afcb9cebc86248c2091f022ee1fd49fed745
font_01_sfnt_off0000e6eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EB 10436 bytes
SHA-256: 17146a4fc0a49e89c973ec58b70a85deb172f21786c83c32d70a2c90ef54f5cb

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