Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c0e96d92a1d945a…

MALICIOUS

PDF

92.3 KB Created: 2021-10-17 02:24:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 28152511b70c5da896667b7c04dc3e3c SHA-1: 5538ffec5f8efcbb7731ee2d5dca0dbd3b2dfa3c SHA-256: 6c0e96d92a1d945a882d70d6e258ae007f1765f2d7f478e5c660125408e3ed19
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or download further payloads. No scripts were extracted, but the structure and URL patterns are indicative of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://nycsmindia.org/ckfinder/userfiles/files/lafone.pdf In PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/fa64872fa79e7312d285837b6501ee8b/12422130023.pdfIn PDF document text
    • http://poliinc.com/upload/files/laxixewegizumigirogu.pdfIn PDF document text
    • https://simondaulte.com/ckfinder/userfiles/files/1870004710.pdfIn PDF document text
    • https://wineuniverse.us/userfiles/file/dudaripuwu.pdfIn PDF document text
    • http://burragebrothers.org/demo/jolie/beta/userfiles/files/rupugenega.pdfIn PDF document text
    • http://revistaspontan.ro/assets/ckfinder/core/connector/php/uploads/files/fafapolaximasinomexunafi.pdfIn PDF document text
    • https://krossi.ru/images/content/files/18303342760.pdfIn PDF document text
    • http://pekingtogo.com/uploads/files/92709031214.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/8fbefdf2c7b890f3487fe48ee3490bc0/35505400539.pdfIn PDF document text
    • http://sukhonthip.com/file_media/file_image/file/luxafijinugufigude.pdfIn PDF document text
    • http://agisinfo.ru/uploads/content/files/52116965532.pdfIn PDF document text
    • https://mailing.crpm.ch/ck/ckfinder/userfiles/files/72507797500.pdfIn PDF document text
    • http://odesignlab.ru/admin/ckfinder/userfiles/files/riwikodinodufobazar.pdfIn PDF document text
    • http://wowbond.com/upload/Fckeditor/file/datalufuje.pdfIn PDF document text
    • http://konditsionery-odincovo.ru/upload_picture/file/40653196657.pdfIn PDF document text
    • https://cmottaviproductive.it/uploads/file/59703808925.pdfIn PDF document text
    • http://nanouklid.cz/upload/file/3733632235.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1615e291889a9f---visikivuwi.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/3930337682.pdfIn PDF document text
    • http://pbpharm.com/upload/files/14920122833.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1616b41bad85ce---38986329168.pdfIn PDF document text
    • http://precisionsurgicalworks.com/alpha/ckfinder/userfiles/files/3675715062.pdfIn PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/varonapinifet.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1615f0d4005152---zomibukesexunuwozawod.pdfIn PDF document text
    • http://esipro.lu/userfiles/file/wobigom.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/tgwjJlsMqHc/uplcv?utm_term=ingress+and+egress+constructionPDF link annotation
    • 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_off000102db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102DB 10548 bytes
SHA-256: af3fbba1de6d8b37b35e0c115b700057d1a2f00943b44cf557c0cb978dafdfa1
font_01_sfnt_off00011ad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD2 18688 bytes
SHA-256: 0908293e2c6cbd8b649ff6bf541374b5c96572fe1f3cd4eb59279e1bd918ca71
font_02_sfnt_off00014b6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1