Malicious PDF — malware analysis report

Static analysis result for SHA-256 d66c506916c3d789…

MALICIOUS

PDF

98.1 KB Created: 2021-08-19 21:31:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 905c831fad88981b81f23420ae72784c SHA-1: 1510b3f1d561bd966cd8165daad472f54cda1f2b SHA-256: d66c506916c3d7895d9703f1c61c1f4151f116452b3ec5b558daf1858daf0f9a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160cb10b0f416e---50739278983.pdf In PDF document text
    • http://sanarina-coaching.de/ckfinder/userfiles/files/dagopelavanebijufowe.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/fd18df40de1bdd7f96ba112b4eee86ab/71909575420.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/05/11/file/20210511_085716_131.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160da6e1715b28---7145491342.pdfIn PDF document text
    • http://jikaramen.com/uploads/files/rijebavitalaxanutapinax.pdfIn PDF document text
    • http://taxiluzern.ch/khurasan/userfiles/files/61686728384.pdfIn PDF document text
    • http://gdlejia.com/uploadfile/files/20210807_222753.pdfIn PDF document text
    • http://angelascanu.it/uploads/file/20699652337.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/9c0gq6ff1ad8u126a6gdccpmms/63895270219.pdfIn PDF document text
    • http://www.scsi.coop/wp-content/plugins/super-forms/uploads/php/files/a43b936b0f49d403607621a5705c0626/rozuzuwupilelu.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/3795895670.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/mexamobesitetivu.pdfIn PDF document text
    • http://yilip.net/userData/board/file/mijumakir.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/vanujotu.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ac047739e88---lidisisugi.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/947d682d9a63d743ec3d10b6da53413c/84671613494.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/ueehovfoi5oit9i3dov5p67tdm/21180866670.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/d9p5mo4600ggrsqrffruikfo44/luwofanizadebajijejelor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=how+to+make+a+bimodal+distribution+normalPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160948930ae039---jetigovaweranafefuxobijax.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011868.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11868 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001307f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1307F 10820 bytes
SHA-256: 6457a1f95d192d761e82b94d64ef00da1712953c94ea4c88c557b7e960a84c76
font_02_sfnt_off0001496d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1496D 18628 bytes
SHA-256: 23cdc29ff8a430cb133bda4fc4190e46c9816bf476cdcff55617f194f587f9f9

Open this report in the interactive analyzer, or submit your own file for analysis.