Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e5b05383030d3c3…

MALICIOUS

PDF

112.0 KB Created: 2021-08-11 04:22:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8c1da8bf4b45a8b5a77b281c443a1c08 SHA-1: da95b8dc59e55aa0efe32ffe68a4263010dc6101 SHA-256: 3e5b05383030d3c3f6495b1900afdb0be5d67ae67b3a7e47e645db1f3332537e
124 Risk Score

Malware Insights

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

The file is a PDF document identified by ClamAV as 'Pdf.Phishing.Trojan'. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites. These links are likely intended to lure users into phishing scams or download further malicious content. The PDF structure and the nature of the embedded URLs strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier clean score 0.2364

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://synerhu.ru/uplcv?utm_term=libro+historia+de+espa%C3%B1a+2+bachillerato+edelvives+pdf PDF link annotation
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/lflss8lb316ttdmo6jl2apn9ka/pabiwakifafuzo.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608181043d118---vupoxaxetulivisorale.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/h5ar995ccqpm6ht78noocrg1dc/dizikadotuvexavig.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5423e6f10---46830274092.pdfIn PDF document text
    • https://akamercedes.com/images/uploads/files/todozasizasixetasunepi.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/460d7cb1d1c84c7d16f1ff602c846497/88134533559.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0231e69a3---zisododujixusorisivevami.pdfIn PDF document text
    • http://morpheus-architects.com/file_media/file_image/file/22726990380.pdfIn PDF document text
    • http://ayurveda-shiatsu-nice.com/upload/files/zajekudamaligoxefup.pdfIn PDF document text
    • https://premiersuli.hu/files/files/tosepases.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/paq26ul47get01ktd3m9hfsc37/67875961921.pdfIn PDF document text
    • http://xinyaoqiye.com/upload_fck/file/2021-8-3/20210803015706300119.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160bc6bc93fcdb---jipita.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160784e59d62b8---59753546389.pdfIn PDF document text
    • http://fluellentrees.com/clients/58222/File/91989512715.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/5tfhongj1t6jkuv3n057bfbpru/12087902332.pdfIn PDF document text
    • https://faresaldabbous.com/uploads/files/7614300651.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/9af9afe4e8bf398ab3cf5a56c893854e/kitidufum.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f294fee5df---sexojos.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d66b8c686a9---64632045532.pdfIn PDF document text
    • http://biurod9.pl/public/userfiles/file/tererev.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/16094788cde4da---gokuvaxeligikowika.pdfIn PDF document text
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/verupoti.pdfIn PDF document text
    • http://grupophi.es/uploads/files/setemosisonazufokoz.pdfIn PDF document text
    • http://sciattella.net/images/file/97485898605.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_off00018923.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18923 11104 bytes
SHA-256: 7428dc78d155967d0f97102385ff6602c62c17373bb71743050f99f5b7a7ef44
font_01_sfnt_off0001a2ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A2CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1