Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3fd33423e3d8174…

MALICIOUS

PDF

72.0 KB Created: 2021-09-14 08:10:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cfd85ba3a21ee63329881c39678d9fa7 SHA-1: 95e893b3a95fdb08926453a07f05fe13ef51389d SHA-256: c3fd33423e3d8174a946f35afb05d48df5743c3663682ed7baaed616c6db895e
124 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to websites hosted on compromised CMS platforms or disposable hosting. The ClamAV detection and heuristic firings indicate this PDF is designed to lure users to malicious sites, likely for phishing or malware distribution. The presence of multiple links suggests an attempt to obscure the final malicious destination or to maximize reach.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4060

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://technocom.pl/editor/file/64920415930.pdf In PDF document text
    • http://hakasasi.id/userfiles/file/79050172765.pdfIn PDF document text
    • https://kakakmanis.com/contents/files/56133662142.pdfIn PDF document text
    • http://bon-mar.com/fck_user_files/file/bibumowuzurejubezazu.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/vamuba.pdfIn PDF document text
    • https://matricula.arendic.cl/files/628803530.pdfIn PDF document text
    • http://bushurov.ru/images/files/92822894704.pdfIn PDF document text
    • https://kueapem.com/contents/files/zidubutudij.pdfIn PDF document text
    • https://adverto.ee/userfiles/file/xijuvojoponelus.pdfIn PDF document text
    • https://chmelo.hu/sites/default/files/file/31603145907.pdfIn PDF document text
    • http://marleenjansen.nl/images/uploadfiles/jigusoximovolijotikofigox.pdfIn PDF document text
    • https://newcar-rental.com/uploads/files/202109032333433501.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/7m1pd3jl1g1usm7j2j35bo5kv3/42126932345.pdfIn PDF document text
    • http://idealthailand.com/file_media/file_image/file/1566382740.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/93564046837.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614013514b809---57377107461.pdfIn PDF document text
    • http://foxgraphics.paulsfashion.in/files/61213383157.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136103f8dd27---87959949465.pdfIn PDF document text
    • http://bocghedanang.com/media/ftp/file/xobarusisibenafujexopofi.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/butolazozibu.pdfIn PDF document text
    • https://mywayrtk.com/userfiles/file/fusekapav.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-9/file/kodilum.pdfIn PDF document text
    • http://squarcialupirelaxinchianti.com/writable/public/userfiles/file/wavopabajexunusuzalinof.pdfIn PDF document text
    • http://ministerium.pt/files/2705217420.pdfIn PDF document text
    • http://totoumi.jp/upload/file/77972040138.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=universal+bootloader+unlockerPDF 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_off0000d423.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD423 18372 bytes
SHA-256: 00450730f61571b4c8499a0e30d095210fc9d45d9604ff0b0ed1a7bc03605125
font_01_sfnt_off000103f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F4 10768 bytes
SHA-256: aa971baf52925ec7c89c81de44c1b388923e6a765e4111e13210f35ec8e82ed5

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