Malicious PDF — malware analysis report

Static analysis result for SHA-256 e75521cd6c695fd0…

MALICIOUS

PDF

89.5 KB Created: 2021-06-25 15:04:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ccd0c6f9c338ff894d853df0a49b5a94 SHA-1: ca58e4185f250e22b8dd2cf8bedce0d0ee275435 SHA-256: e75521cd6c695fd0f2ab4e459aced0ce731e8478adcc194ba06e6ebcf7b17c6e
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is unreadable, but the presence of external URIs and compromised CMS upload links indicates a likely attempt to host or distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://crewmak.ru/uplcv?utm_term=mehndi+designs+2021+new+style+simple PDF link annotation
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a96d1ce4b67---mupafedugiwebexadojugufel.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aca21d9a34e---76459755283.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b65b548a837---jumuxepuku.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/nixagifesekuxilulow.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/24dbd6ce3912648e6ce2aa02508de8ef/gimun.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a54c53d9cb4---ragapojunudidodofize.pdfIn PDF document text
    • http://velo.hu/UserFiles//file/varemibidajokalule.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a00fd4b01ed---firekibajup.pdfIn PDF document text
    • http://www.siposferenc.hu/html/12411294336.pdfIn PDF document text
    • https://gute-reise.ru/i/files/files/nomokaruzose.pdfIn PDF document text
    • http://sbsinternationalschool.org/sbsisnew/userfiles/file/kejadezinipivod.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/khhtu7von6stbpqc8v1oek61q0/67592062957.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160899b0866b8e---bapuvoma.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093fd26ad80a---jubitazuboxutelen.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079530fc1e9f---54952456599.pdfIn PDF document text
    • http://446888.top/userfiles/file/katonadigalo.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC1A 16976 bytes
SHA-256: 3115efe8ec0146c94a03e72cc3747a3c8c058e65d62eab2649d7b22eb5524852
font_01_sfnt_off00012810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12810 10944 bytes
SHA-256: 0ae42d08c9ca0e7ff3fae7e00337cee745a4dcd96af871588e77d0cc776a6c7e
font_02_sfnt_off00014126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14126 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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