Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b8efe2a2bdc9f5f…

MALICIOUS

PDF

69.3 KB Created: 2021-06-20 00:18:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aeafcb6e8051c1a49e36c4a19fde8b29 SHA-1: a497472820c4b8c01d34e951b6686c290561768d SHA-256: 4b8efe2a2bdc9f5fab58cdf9d237d8072424950b28622ed99290deb8b3412197
154 Risk Score

Malware Insights

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

The PDF document contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The presence of a URL related to 'Skam Italia season 1 episode 10' in the document body indicates a lure to attract victims. ClamAV detection and ML classification further support its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9019

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://oniceh.ru/uplcv?utm_term=skam+italia+season+1+episode+10
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a063ac91485---34797632765.pdf
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160bac54795d6a---kuxivebided.pdf
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e610408e1---magafigaz.pdf
    • http://nprofit.hk/userfiles/74714407900.pdf
    • http://dagmar-e.de/userfiles/file/57225532983.pdf
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082ab800fc72---97557252038.pdf
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083966b6735f---powigakit.pdf
    • http://assushop.com/userfiles/assushop.com/file/kesufedawexorudaki.pdf
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc1f2a06550---4469634718.pdf
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/b6n24oo6sjgc05k1ublfnj7mja/dubugejutidevakebas.pdf
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b6c717c1dd1---wisezisekimezede.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/u29a3hrfgm5u4901imfd3tk7u1/4685817631.pdf
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa86763bb5---vugisovetoxumodetep.pdf
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606d34b2ef042---kokiwatikib.pdf
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0e1acd66f8---8333169500.pdf
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16075e0d9b76c0---88968172081.pdf
    • http://winfielddeli.com/ckfinder/userfiles/files/65888564048.pdf
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e4a3c13d8---genajunosetugoliso.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1af.bin
d3f5f5b12bf04dee7b9d49c1d29bb60a62abea355bf71fbb48ae1a8f63bb4020		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1AF 5368 bytes
font_01_sfnt_off0000f3eb.bin
29b19a1188ddf3c5c0045a220fc5ecb9cb9fb5b03d0b6e0a3a00b70b8a84467b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EB 13488 bytes

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