Malicious PDF — malware analysis report

Static analysis result for SHA-256 754f9e9d953a939f…

MALICIOUS

PDF

155.6 KB Created: 2021-05-18 16:48:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5eea9f4411e94b73f2b6f06324e1b764 SHA-1: ce83219739c3cc4d3a2b65a63bf40988127ddb14 SHA-256: 754f9e9d953a939f473ee7914f3abeb3b8cf3babf228cdd45349c9f80640014e
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to compromised WordPress upload storage, likely intended to host and distribute further malicious content. The embedded URLs, such as https://nomylo.ru/uplcv?utm_term=telugu+mp4+video+songs+2018+free+download+2019, are designed to trick users into downloading malware by appearing as legitimate search results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://nomylo.ru/uplcv?utm_term=telugu+mp4+video+songs+2018+free+download+2019
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083fa8b0fe20---71297982629.pdf
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/bda459d256c0c6690cb79333cc4493d4/77616228493.pdf
    • https://twr1115.net/files/fckeditor/file/gasesawosozaxuzuronewi.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160717f283540d---xeboxubiwo.pdf
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/3o0pp5ropd34ra2ejn6ks7tl63/59092633302.pdf
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/88ad54ae3990fadd1caa99461e8738ae/66841177878.pdf
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/7roqk993008fd2fb0gqabdo8kn/tedejuvaneji.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608291ace7733---10706882722.pdf
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/6e15161585b82342cb580bae79d1b93f/sebiredopijud.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16085b2151b4ed---8955026622.pdf
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/3c8ef6b845068d88c87af2ba30418fd3/39424137421.pdf
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c27e8834c5---49043405856.pdf
    • http://aksaaydinlatma.com/img/editor/image/file/30626233278.pdf
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16077ad3081b5e---beves.pdf
    • http://fedorahosted.org/lohit
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNU
    • http://www.gnu.org/copyleft/gpl.htmRegular

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00020508.bin
50e7eb62c3233c62b077449fe1ba0b4fdf1f8231f5e0e60ff899b5c8d298dc25		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x20508 25452 bytes
font_00_sfnt_off0001efd2.bin
0f7d604c3c2d837e60723b7273d0c32e6b044c45ae437f9846614b2ba6c0e9cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1EFD2 6224 bytes
font_02_sfnt_off000239ca.bin
5afe9310e7063c746d81727f57e0e2a5b07d780e3f03253077586637f6d79b40		 pdf-font-stream PDF embedded font (sfnt) at offset 0x239CA 18672 bytes

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