Malicious PDF — malware analysis report

Static analysis result for SHA-256 f52637320035e74c…

MALICIOUS

PDF

81.8 KB Created: 2021-09-07 13:15:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: fa300d29593299381ee7c54edd49cf47 SHA-1: b19a626fff853bbda69b2d4ebbaa516c0a8d3fce SHA-256: f52637320035e74c47d76a4e2f814c216427c1dbaac9605ba5247d8c4bda8994
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as a phishing trojan by ClamAV. Static analysis revealed it functions as a link farm, with numerous embedded URLs pointing to potentially compromised or disposable hosting domains. These links likely serve as lures for phishing attacks or to distribute further malicious content.

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://bftt.marketsearching.com/upload/files/18027636974.pdf In PDF document text
    • http://blackshirts1962.com/clients/f/f2/f245580d3072b78cda2271cf7a7e3f61/File/71508452420.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/bonarozuvevekemojew.pdfIn PDF document text
    • https://argumentua.com/i/file/zijanev.pdfIn PDF document text
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/d067e2e82416b716d434ad96fe6b1d5c/bepomi.pdfIn PDF document text
    • https://queensflower.nl/clientfiles/1371270946.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tetitavate.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/bc3df63fb20694bcde9cfffbdaadd417/20242033424.pdfIn PDF document text
    • https://jamisonfurnace.ca/userfiles/files/zivafuluwaxugak.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2f40e7f767---wumagewetosalutoxaxi.pdfIn PDF document text
    • https://tekstilkentrehber.com/upload/ckfinder/files/gitagoxufulewaride.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16091e0f5dbdd5---58804377894.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160e8178b090a5---18395531384.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c6fdd1a3ac4---jiwakotateborunukivama.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/161059fd910bcb---5434210381.pdfIn PDF document text
    • http://blessedfamilycovenant.org/clients/c/cb/cb727bc273eb4203dc66fb73741ae5ae/File/fixepoxebotupigogikak.pdfIn PDF document text
    • http://goodlack.cz/userfiles/file/wadejet.pdfIn PDF document text
    • http://phuongninhphat.com/uploads/userfiles/file/89238984833.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/8b60813e1b28139549251ee78b781142/75709244102.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/rupexalit.pdfIn PDF document text
    • https://pianoinprimopianofestival.com/uploads/file/kulebabiwivemixagebe.pdfIn PDF document text
    • https://aquatrustfina.com/userfiles/file/xivabadenideza.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/xuzazodule.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=polillas+nocturnas+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_off0000fa25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011237.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11237 20580 bytes
SHA-256: 77a3527499378abbf3aad28acd07bd67a77ad16f7ad1abb9ab8e8c3776231158

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