Malicious PDF — malware analysis report

Static analysis result for SHA-256 5587af3bafea7ad9…

MALICIOUS

PDF

92.3 KB Created: 2021-07-07 12:16:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 15ab0a193e341945afaf08aedf19cdd7 SHA-1: 8a22c9d09172322f5cca873ae4724c8892157b18 SHA-256: 5587af3bafea7ad9f7f3c919b350daeeedde07243a89c3b17188cf7f26305e07
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to compromised or disposable hosting domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://adasms.fr/userfiles/file/fikokude.pdf
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073d6e1f0c54---xulug.pdf
    • http://2478.ru/admin/ckfinder/userfiles/files/3750967392.pdf
    • http://sb-78.ru/files/file/69166950428.pdf
    • https://mimpiindah1.com/contents//files/98809878060.pdf
    • http://cartopack.com/Images/file/nimuku.pdf
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/36f1c13f21bb01fb229730af7e881803/sefekegokijugazute.pdf
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/0c2d61a458e6127f135f4b7398733032/10176713003.pdf
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/95366559631.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d29065d4aa---fugumebegadogerakepa.pdf
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/63631751712.pdf
    • http://anhuizpyy.com/upload_fck/file/2021-5-3/20210503200043227708.pdf
    • http://www.ecostroyservis.ru/File/mazapovawukonox.pdf
    • https://sgpropertylawyers.com/wp-content/plugins/super-forms/uploads/php/files/918d8f11f4708abae42708b12d8e6a49/41250416972.pdf
    • https://telewebmarketing.com/FCKeditor/file/livobefenanovetikamupu.pdf
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/3vs8c3f4b95kp4kkd1vn3gqj48/fegigekoz.pdf
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16094035662711---nebefirubobaxodunere.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c356923eb80---fegesanigufut.pdf
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160819f17ccef9---baxizozivil.pdf
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf608da5ef---pedufikisotukotegosikeko.pdf
    • http://crosswaysrecruitment.com/userfiles/file/roxelonojovikejuzizuzuj.pdf
    • http://www.heksan.com.pl/file/8567477272.pdf
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9bd6996e5---pepikelolixawafovan.pdf
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/9549e687ad4a41180edbbe492b1df408/60521500999.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=as+a+follow+up+to+our+discussion
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001048a.bin
cfed94ee8344fd445c9420e368eb34ca110931be2ad4bd8b0ff4d753cd31ddba
pdf-font-stream PDF embedded font (sfnt) at offset 0x1048A 17756 bytes
font_01_sfnt_off00013339.bin
2469f6c506eb3f6bfcae5b3005f42b0cadf4d4b52d05a3c238ea3a38d85e57fe
pdf-font-stream PDF embedded font (sfnt) at offset 0x13339 10648 bytes
font_02_sfnt_off00014bcb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14BCB 16792 bytes