Malicious PDF — malware analysis report

Static analysis result for SHA-256 83f0bed5552e6898…

MALICIOUS

PDF

67.9 KB Created: 2021-07-23 19:23:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 88bf0e8bcef1f5d09b2551bb66e21e84 SHA-1: d023a0a1ebaf00be9ebf62db30b0e4bc581f978d SHA-256: 83f0bed5552e6898bc3d2e3b5a1ca357458f4967a1d6730ec577b4d9a6f10a13
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting domains. The ClamAV detection and ML classifier indicate malicious intent, likely to lure users to malicious sites for phishing or further malware delivery. The presence of a link farm on disposable hosting is a strong indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5275

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 http://sung1.com/upload/files/didozavafevaxabe.pdf In PDF document text
    • http://alphaconsultinggroup.us/vpw/images/file/69443825920.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/7fe35f2b965f6a59b5a954298a1fed99/92813562969.pdfIn PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/545de9348e46d8ee2ce4dabf47af36b6/4195920519.pdfIn PDF document text
    • https://www.areatransfers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984a49cdadd---kuborumugeturozikogadolar.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///dugatokebozurusi.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d75d9f48f77---tijiginomobiporijeku.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/5c83adae746ee2ea94c779736e5163c2/sawugubajuwijegem.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/12824792206.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b691280cb0---tinedaxipiwivomipux.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/divimufex.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160836d99763a3---29332551910.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/dce5505a3eacfa214cf7846d8dacd271/denulobudolenozasosil.pdfIn PDF document text
    • http://bigsvatcharasith.com/userfiles/file/61721182407.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce929277d7---susumiropi.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/98447957716.pdfIn PDF document text
    • http://abwvictory.com/uploads/files/dafegepifubi.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/43429226528.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ba8414caf6---duwigifinogexol.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160af72232c6b5---49472895474.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b29edd995aa---matokibefad.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/35168491803.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609da40ce7347---78407129078.pdfIn PDF document text
    • https://thucphamtruongxanh.com/Upload/files/53887438014.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c69e4e5109c---31806752306.pdfIn PDF document text
    • http://gomientrung.vn/uploads/image/files/xavubef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=cambridge+igcse+ict+second+edition+pdf+free+downloadPDF link annotation
    • 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_off0000c6f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6F3 11220 bytes
SHA-256: 7b0c727647c864b189ec3669e52e77c9fb9bbde9972e528dca12472865d89b3e
font_01_sfnt_off0000e0d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D8 16432 bytes
SHA-256: ab4c8bf2b832911cbae1b0e953d71b1e3b1a6cd7337341a0b3913f63e491e9b4