Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ce5878ccb656dc1…

MALICIOUS

PDF

82.2 KB Created: 2021-09-20 19:55:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 66429ae2b00bce29f131db413a95f372 SHA-1: 1eaa2d1bec65991811d6cc6d20adc597ee842041 SHA-256: 1ce5878ccb656dc1099f4c5fd455a8a46aeaabe1add660e264a55a0200f73c3f
124 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV with a 'Pdf.Phishing.Trojan' signature. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to various domains, some of which appear to be compromised WordPress sites. The PDF's structure and the presence of external URIs suggest it is designed to lure users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4456

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://allytemp.ru/uplcv?utm_term=5+major+biomes PDF link annotation
    • http://quick-thailand.com/images/uploads/file/68907781852.pdfIn PDF document text
    • http://theaterbuehne-schwandorf.de/userfiles/file/liluniwixego.pdfIn PDF document text
    • http://intertravel.hu/_user/file/64300986616.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aaf58e33aa---65484335141.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/6445865836.pdfIn PDF document text
    • http://progettogeometra.it/userfiles/files/mezukurigasu.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142534f8f1ef---10214129539.pdfIn PDF document text
    • http://vansuloi.com/uploads/userfiles/file/14343980168.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/443397666a354c3bb35eb9aac8f7be6f/rudozo.pdfIn PDF document text
    • http://transbur.ru/admin/ckfinder/userfiles/files/11916492481.pdfIn PDF document text
    • http://veitali.com/upload/files/wuniwosifola.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135b29a34915---6879730198.pdfIn PDF document text
    • https://konyaalotaksi.com/userfiles/file/bikagamejosesunurumenija.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16140cf63d895d---xamaketo.pdfIn PDF document text
    • http://irinabailey.com/upload/files/59091210563.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613db97501865---73951217579.pdfIn PDF document text
    • https://xn--80aesyq.xn--p1ai/files/file/84246932034.pdfIn PDF document text
    • http://carrasvilla.es/uploads/files/56455126142.pdfIn PDF document text
    • https://phukienbep.net/media/files/benevokuxuvigujetaf.pdfIn PDF document text
    • http://longruiglass.com/ckfinder/userfiles/files/20210911_233029.pdfIn PDF document text
    • http://masterkontroll.hu/ckfinder/userfiles/files/resut.pdfIn PDF document text
    • https://nbc.com.vn/ckfinder/userfiles/files/3730075868.pdfIn PDF document text
    • http://gzafjc.com/uploadfile/files/kabolal.pdfIn PDF document text
    • https://zegaoyun.com/calisma2/files/uploads/zewiledatexevuru.pdfIn PDF document text
    • https://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/23782762757.pdfIn PDF document text
    • https://ratodua.com/contents/files/31513898146.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_off000117d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117D8 17680 bytes
SHA-256: 5c33a099d1ced95136145d6b521dbc83bc5dee86100bcd5df72b0a05b671affa

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