Malicious PDF — malware analysis report

Static analysis result for SHA-256 6374bdf9e4a7b542…

MALICIOUS

PDF

72.0 KB Created: 2021-09-06 23:12:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3c539f999396f24e07fff65586a86667 SHA-1: c56eb70a8e58c5b841244cf738e901b9762f9efe SHA-256: 6374bdf9e4a7b542f01c7a3b00f8053f73854371b202ba6807500ab6081e9594
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers, indicating malicious intent. It contains numerous links, many pointing to compromised CMS upload directories, suggesting it's part of a link farm designed to redirect users to malicious sites. The presence of external URIs and link farm heuristics strongly suggests a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5836

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://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/605a62484004e79394ef6b10335f5e76/52210687749.pdf In PDF document text
    • https://nikunjfoundation.org/ckfinder/userfiles/files/45769801572.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/6674e4216c71920440032cbc587abfff/80534100631.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/76974d5fe33e8e143a852681a9fab0f8/paposonuwik.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/soxokilawoxalugi.pdfIn PDF document text
    • https://newtech-utm.pl/userfiles/file/78525768629.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/20468526599.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/najemululedimobejituwowa.pdfIn PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/gagopow.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///202107109257_119042400.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/d09n6ltpamuvesslth8ou3gu34/50140823257.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/518c7ef9a2abae0984a4a6da8c3e1575/vizolugutugogesopujata.pdfIn PDF document text
    • https://plantbiochem.com/ckfinder/userfiles/files/desopej.pdfIn PDF document text
    • http://lindendirect.com/tempimg/file/89523809525.pdfIn PDF document text
    • https://aspaeng.com/files/image/files/jovemesegerebil.pdfIn PDF document text
    • http://gleneaglehoa.org/images/file/zozinokilutonu.pdfIn PDF document text
    • http://www.agenbenangbandung.net/file/84924452510.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/a65d0d0731b774f0c3196a83672d91b2/ruzadunuzipadisen.pdfIn PDF document text
    • https://typeone.com.my/ckfinder/userfiles/files/kotixuzopu.pdfIn PDF document text
    • https://baigiangtoanhoc.com/upload/files/fawagogijelidesu.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/52790373991.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5cd1c878b---96092943772.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=aprendizajes+clave+pdf+primaria+2+gradoPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00010b67.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10B67 14991 bytes
SHA-256: 8b7e614f30904e469ed2bdabb46874cab6d0222405c0ebf3a3f6e1927a6de33d
font_00_sfnt_off0000c0e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0E0 11220 bytes
SHA-256: 04f3bd1e29d2aaddf07f81c2e35dc462de0602dbd3544ba24cd4cfb140769c45
font_01_sfnt_off0000db03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB03 18940 bytes
SHA-256: df91786c549be4fbf5b4d1ef40df84e80812aafb1725aafeeb784b8087caf125

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