Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa0091712e23ff19…

MALICIOUS

PDF

62.6 KB Created: 2021-05-10 00:26:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9eef2cdb3eada452d98ce0dcc0d65ff9 SHA-1: 59122e8ed91778f811426d472a24c86ae86a57cf SHA-256: aa0091712e23ff1999795ceb02427ba54950c5aa65ab4aef66f2d419caa6c831
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to compromised WordPress sites, indicating a link farm designed to redirect users to malicious destinations. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple distinct hosts and the use of WordPress upload directories further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8553

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://awlights.com/wp-content/plugins/super-forms/uploads/php/files/a79076a592d4b5d1c8138821b31ef6fa/75956489948.pdf
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/i5eggajpshs6d9p6oocqjnqve4/82164650344.pdf
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/77533615b9708c0f5b5c0ffd6e75fe12/solamage.pdf
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16091fc9f2c455---57526501656.pdf
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/071dbc9b33d8bc7b8657c060cb493f2c/51596441331.pdf
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/63abaf611d912a2b1c2ed8dc9ddc1c3d/sosorifamirofugovomo.pdf
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e704c51c4d---ruzudotubedabuxarowe.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea7e322b5c---tejisavuxetowop.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4078501e5---fewivi.pdf
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/6e399c6b482840c504c11a14fc94ecbd/pezapokovibaja.pdf
    • https://anmoul.com/userfiles/file/pixonaxebozetevekape.pdf
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096d17376cc4---91771508125.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/af957e8ae21c4fffb49abb1f8f9f7835/96996244183.pdf
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/cdd64515cf0f6858165ba1449068a40b/zudafikezijumu.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c18ea23854---gotuluwaxatala.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=email+marketing+campaign+strategy+template
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d272.bin
b9305d885f7e5e88cb41eda7fca0393dc87cc20935dabef96ec0de3f2a68511a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD272 5376 bytes

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