Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e3de8caf3ab3e98…

MALICIOUS

PDF

94.1 KB Created: 2021-06-03 20:54:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 47abb7876c43d66cb5dbf5e604be5742 SHA-1: 89f970a1668a462c8c4d901858b5726b80e26934 SHA-256: 5e3de8caf3ab3e98d6565344b87a4598d43237950419ca920bc0764885295cc3
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to distribute malicious files. The ClamAV detection and ML classifier indicate a high likelihood of malicious intent, specifically a phishing or trojan distribution campaign. The document body, though heavily obfuscated, contains references to game modifications, likely a lure to entice users to click the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7447

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://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/8a10e7n85r7jca79aucsc2b1a2/votip.pdf
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/ab11c26d12c41057e36fbb366cd536c2/waponarexozabovepus.pdf
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/8ad798750618c6926698059c5384e93d/wawafulagibinobapalekapa.pdf
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b13c2dd2a7f---gokefupofepegipopizuzumox.pdf
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/e2d762f7ebb5e81e125890c38b152f03/38695761994.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adf16c6b598---34116733730.pdf
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160803d5db95ea---sevodulokopetivi.pdf
    • http://iaestedresden.de/userfiles/file/tewujepupebixedobokoti.pdf
    • http://www.jindatunnel.com/up_files/file/zelipusabowuxajanek.pdf
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d330271d4c---vozupeluvuvujazasulazaxi.pdf
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2947ad4122---47999560983.pdf
    • http://cdkkck.com/uploadfile/file/20210527223330.pdf
    • http://digifast.cz/userfiles/fuxekejolikilafi.pdf
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/5kkbbpek0979jkjj5g0al0jd11/81063775810.pdf
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/525l6qdghbqi31q6mb2b6o4q1g/84582669111.pdf
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/7rc1udq80444v9psefd02l80ta/kitorejajudixefa.pdf
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8740b5a5f8---bisudosedatanixodeso.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=pack+de+mods+de+dragon+block+c+1.7+10
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012937.bin
021eae0c6e05b9b4b9d8e55fa8d51968a92a4863bc13d99b1c3f03a14061304c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12937 2952 bytes
font_01_sfnt_off000133be.bin
9111a5d60a266599dcd6fe12432049b60377da6892faa158a82e2dc376576f22		 pdf-font-stream PDF embedded font (sfnt) at offset 0x133BE 5772 bytes
font_02_sfnt_off0001475a.bin
53413f44bb76f656dfe9cad6f9bb59e05dae24125cd9ee38da8d651d6cd80a76		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1475A 13300 bytes

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