Malicious PDF — malware analysis report

Static analysis result for SHA-256 41b4b32d47db7885…

MALICIOUS

PDF

84.5 KB Created: 2021-07-26 20:22:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 036b0f5b5b6a8f556afa5de31cbd4191 SHA-1: afb469c5907bb1a182ebf542d04f9c6b9b5522cc SHA-256: 41b4b32d47db78858d40fa16e46214af6bb0838a542d0acce4e169ab3ad042d6
124 Risk Score

Malware Insights

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

The PDF was identified as malicious by ClamAV with a 'Pdf.Phishing.Trojan' signature. Heuristics indicate it functions as a link farm, with many distinct hosts and URLs, some hosted on compromised CMS uploads. The document body is unreadable binary data, suggesting it's not intended for direct user interaction but rather to host links.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3497

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 http://silesiacapital.eu/data/file/poxewagukalosawe.pdf In PDF document text
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/e33cea7a5dd94f1000735b019901c66d/sikezejaxekawesevufenum.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/22345663455.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/fonijokutuzuzine.pdfIn PDF document text
    • http://ustunongel.com/image/files/xirugekelulexumog.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/r2bpt8r2bklrc1l10elp4gtpgo/geminabomerererevaposi.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/5ifeqkqjimh6p070qtjvddi2v9/zirafojomi.pdfIn PDF document text
    • http://lakehighlandsrw.org/clients/863582/File/xigakubalumanetejej.pdfIn PDF document text
    • http://flirtproducties.nl/ckfinder/userfiles/files/17531588263.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd523f3f3e---30463178923.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/fda2dd3a0b3a7b4e741d68796abff49c/pebanujajezow.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/4bd6c0ef9e1ecb782fe3c08c513f40f8/vugesojitaxijigatavawuf.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/8b1fe2da1f4f0f0ba896f97713b48c8c/7452355536.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/iopml421g3spb1mj43n5qjbpgp/68985543935.pdfIn PDF document text
    • http://amouage-salon.ru/admin/ckfinder/userfiles/files/xunexax.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/lr0btblunpjk0oghcagsuvehg7/82819001607.pdfIn PDF document text
    • https://clumba-indoor.ru/files/files/xodavubusite.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac235d5c67c---kuviraz.pdfIn PDF document text
    • http://malifer.hu/upload/file/digexona.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e65a86ba800---59434101018.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/16074113b3f8e4---wiburiwemoxedij.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/49836e0af026196b4c0235e679f65ada/sizajiperiri.pdfIn PDF document text
    • https://peintures-descours.fr/fichier/files/jaresipitemidumoxiz.pdfIn PDF document text
    • https://drddvichitra.com/userfiles/file/pidaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=coordinate+plane+graph+pdfPDF 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_off0000ff48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001175a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1175A 17604 bytes
SHA-256: 4d3211ee4b424933f1d04c740c4cc2fc710da1a5c7721ab8dfe63c496552495d