Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9c5ebf437ec4189…

MALICIOUS

PDF

71.3 KB Created: 2021-09-19 18:31:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f902eff7cc14db1748bc45cd85e8b713 SHA-1: adb286e9a5152258b183df5f33deb491ac71f9b9 SHA-256: c9c5ebf437ec418954fbf6d2370089fd5aa1522299188ea393390d1cdafcb786
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and link farm patterns, suggesting it's designed to redirect users to potentially harmful websites. The presence of compromised CMS upload links further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • 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
  • 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://pistant.ru/uplcv?utm_term=present+perfect+and+past+simple+exercises+pdf PDF link annotation
    • http://zhuoer.ltd/userfiles/file/wezemuzuvot.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/da0f6ad6e5a5012286b48c6d493198c3/88156528955.pdfIn PDF document text
    • https://www.cylinder96.ru/admin/ckfinder/userfiles/files/14547322203.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/52defdffdc6ed28ea1e275ecbf427392/3488721742.pdfIn PDF document text
    • http://radio-salsa.fr/php/rs/filesupload/file/fulaj.pdfIn PDF document text
    • http://nanoservice.cz/upload/file/vepebipodizuwivotimija.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/masuxopol.pdfIn PDF document text
    • https://8cj2aja7-8mxb.com/contents/files/mitakigexo.pdfIn PDF document text
    • http://apmnir.ro/fckfiles/file/17894226001.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/c43cdf7aaee6d4da0d88fc85d6751aff/24850035599.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/3c4ab1d0ba5b0023f20244b6a5947b52/kidatenubewuzox.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/26064268579.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16135b8aa9e620---19351048767.pdfIn PDF document text
    • http://sobateracota.ro/mm/file/21729853028.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/1023509185.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/8023504287.pdfIn PDF document text
    • http://as-eng.biz/userfiles/file/29015461654.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_off0000b53a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB53A 16228 bytes
SHA-256: 29f7402d75ba0888683fbada018e593c18bf29196a82b2ceeb8235a23f063e92
font_01_sfnt_off0000decc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDECC 10764 bytes
SHA-256: 49f0bb117e6a0115671230c5bd9a04053585e5890a2ce8888f00a61c601f9dce
font_02_sfnt_off0000f78f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF78F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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