Malicious PDF — malware analysis report

Static analysis result for SHA-256 2626b75c35fe527e…

MALICIOUS

PDF

70.8 KB Created: 2021-09-02 09:00:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7c145fe2922e43f5f6198d0423a79aad SHA-1: 78eb30fb98ef7cfb17ab6928d5ab704c8e667717 SHA-256: 2626b75c35fe527e4b15f101ca2a35f669cc8f58ed42f1897c48e810f4aca896
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which are hosted on compromised CMS uploads or disposable domains, forming a link farm. This suggests the document is designed to lure users into clicking these links, likely leading to phishing pages or further malware downloads. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://wastran.ru/uplcv?utm_term=knocked+me+for+six+meaning PDF link annotation
    • https://global-brand.net/userfiles/files/84764763663.pdfIn PDF document text
    • https://lanegarrett.net/userfiles/file/26093709001.pdfIn PDF document text
    • https://gulyaskantin.hu/uploads/frontend/files/6572512265.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/ba2a888dc28c47129391ff295588c6d4/97378392524.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16071ed21bf1df---17953783982.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1610649aa5cc9e---kedodozerakolixakoluwuto.pdfIn PDF document text
    • https://fishuntpesca.it/file/fesibojib.pdfIn PDF document text
    • http://mediedil.eu/userfiles/files/72296963850.pdfIn PDF document text
    • https://perkunasstudio.com/uploads/files/202108140816365629.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0b05535ef7---7304717403.pdfIn PDF document text
    • https://99shayari.in/userfiles/files/71621774395.pdfIn PDF document text
    • https://tutorsbureau.net/userfiles/file/41656215108.pdfIn PDF document text
    • http://rotang.net/userfiles/file/92486016354.pdfIn PDF document text
    • http://70sromans.com/clients/871711/File/setopuganiz.pdfIn PDF document text
    • http://gyarmatilovastorna.hu/userfiles/file/38330845389.pdfIn PDF document text
    • https://sbmhavacilik.com/userfiles/file/93239715151.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086d528ab85c---31626595111.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/42816429821.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075325061fb7---damobupiwoduxu.pdfIn PDF document text
    • https://www.santaterezinha.com.br/js/ckfinder/userfiles/files/11494659559.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/jrsecto6a9gfaao8n9d0vtlt74/vasubobu.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/jobobijuxas.pdfIn PDF document text
    • https://ikima.fr/uploads/file/11904603323.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/sibaduba.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_off0000b5ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE05 10860 bytes
SHA-256: fc0607f64f51d351ea613f551607bdf4ef5e9fd74c789246e7e97e1fb1b09ea4
font_02_sfnt_off0000e6e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E1 15100 bytes
SHA-256: 43c9a31c75cf23e89b8165939c49978a16f6041a749ca80a601364b4a429f1c0

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