Malicious PDF — malware analysis report

Static analysis result for SHA-256 537f4510e15ccc0b…

MALICIOUS

PDF

78.1 KB Created: 2021-07-03 02:13:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f0cc39d5b48623a8c93acd166a9d644e SHA-1: 430ed106165982f6aec50f153d6aa8a0cebfc065 SHA-256: 537f4510e15ccc0bb7956a24d014e1eb133add7096c772b998a125a306058d21
124 Risk Score

Malware Insights

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

The sample is a PDF file detected by ClamAV as a phishing trojan. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and the nature of the links indicate an attempt to exploit users by directing them to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4580

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 https://wastran.ru/uplcv?utm_term=watershed+management+ppt PDF link annotation
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/0e8e4e35785257d7ec59012f45255c10/60847683139.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/654v82nfikcf3saak4u6jjbeuq/70726397892.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/1e5f50c17a24ba364343af6f013b3be6/xemanevugusejox.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160be671572e8f---fajozarerobipizeta.pdfIn PDF document text
    • http://uniquecharacters.com/upload/files/zaborujo.pdfIn PDF document text
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/17bc59dd9c0e7ee9bb75f4d625a16723/81490918997.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/qmaerdo7rciknfipmt908am1p4/4207799451.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/31746570249.pdfIn PDF document text
    • https://vieiras.pt/imagensprodutos/file/sanuposoxurogumavoja.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ae8c2c4c88e---mulinijuxewulijawi.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160dcd8b67e17f---ritelojewa.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/61005148223.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/ceb0e3fecf71cd89a93cf9e02e2032c5/jajalajititumevisumo.pdfIn PDF document text
    • https://childconcern.in/trila/userfiles/file/47217720549.pdfIn PDF document text
    • http://thegioituigiay.net/uploads/files/jofobaz.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16076de0a8e9fc---11809393590.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/99254684d3f994d96db9413f0fa28444/gemezomaruwewo.pdfIn PDF document text
    • http://hasici-pristroje-eshop.cz/files/file/5983170335.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/xupovaz.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/sixubiz.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/k8vuifana57rovu9571g5e67j3/luvatu.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/kdihpit2jhi8ijm8a42f7vgred/59585332968.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/eq3ubkua2ihcfl49pe7dfc8712/35517325369.pdfIn PDF document text
    • https://baobihungphu.com/media/ftp/file/fozofuki.pdfIn PDF document text
    • 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_off0000fa70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA70 10576 bytes
SHA-256: f66bf7279e0de5e9316f1405e05f9ce285018f6783a481f7a46381e01c394f30
font_01_sfnt_off0001122d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1122D 16380 bytes
SHA-256: 2f0f2b2eb8adfd382bd5595154112d9a96155f591f04685a5888fae58ac66125