Malicious PDF — malware analysis report

Static analysis result for SHA-256 94af6b90686f2ceb…

MALICIOUS

PDF

82.2 KB Created: 2021-09-05 07:57:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 23801754fe739c895ef6539d24435b6d SHA-1: e694597fd3ad743905bb3de5b957c67eda955933 SHA-256: 94af6b90686f2ceb51919deec420e489f67191ebefec9618f45a6d1ec1f9ce51
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories and other disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of these links and the nature of the heuristics strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611ce068878b1---44943508726.pdf In PDF document text
    • http://bisenzia.it/userfiles/files/26266557712.pdfIn PDF document text
    • http://szpital-sulecin.pl/images/fckfiles/file/gerupidagarunolomenozef.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c92f6d8fb86---5983665752.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/jiribefafos.pdfIn PDF document text
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/93765296927.pdfIn PDF document text
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/orb3c4smqejcol6aa20v2svpcm/69142914022.pdfIn PDF document text
    • https://manajrgvaaradhi.com/cms-uploads/files/61975529953.pdfIn PDF document text
    • http://karate-talence.com/newsite/userfiles/files/nowupavovilurujupabidade.pdfIn PDF document text
    • http://marmaraisg.com/images_upload/files/zejesebepub.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/77809587850.pdfIn PDF document text
    • https://ankaratemizlikcim.com/depo/sayfaresim/file/58095767674.pdfIn PDF document text
    • http://schokofontaenen.de/idata/nafivono.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/3798f96a6a07c2f53680f8c76f2a42a8/50564094508.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a773848ea02---labijosuzuvimam.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e409622fb4.pdfIn PDF document text
    • http://turnwealthy.com/ckfinder/userfiles/files/68387931992.pdfIn PDF document text
    • http://fge-service.com/userfiles/file/17565868769.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/laretubumixixuzife.pdfIn PDF document text
    • http://skiflogistics.ru/userfiles/file/zorudefaw.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/80218563495.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+make+a+pdf+document+look+like+a+bookPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7cad76813f---50365405661.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_off0000d79e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD79E 19724 bytes
SHA-256: ad4dd4bbce624b4758a20a5cd0d17eeccf349056eaec87cdee82f2f050015abb
font_01_sfnt_off000109d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D6 10920 bytes
SHA-256: 1d672db7fd54c7baa430245f211067c0bcc3e868b0274fe3348c6bf2ba710391
font_02_sfnt_off000122db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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