Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b3df7a5b34b336b…

MALICIOUS

PDF

77.6 KB Created: 2021-08-18 07:23:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b73df4cf1bd8864fc8fdc09cd19281ff SHA-1: 96bc709bd8f41fca9f34223276532ce73590edb9 SHA-256: 3b3df7a5b34b336b0cf98095a873b739db97684c05a8144c5109d00c4df2f270
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links to external websites, many hosted on compromised CMS uploads, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect users to malicious content, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1773605dc---64318484367.pdf In PDF document text
    • http://ylpqzl.com/ckfinder/userfiles/files/68023502545.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/88008219458.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/silewoxazabemuvuw.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b99d37dc3e---vitodoxudelononojopa.pdfIn PDF document text
    • http://tandartsindex.nl/images/uploads/malemopon.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/6apolh1ghn4m9cggajg57edb70/36169513839.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/malafakenopox.pdfIn PDF document text
    • http://udelimpa.es/ckfinder/userfiles/files/34686139033.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/58811998080.pdfIn PDF document text
    • http://kalikraft.com/images/file/7781168900.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/dda7e0d3aa30fcbbd9b7e7c647472103/weloteraputosugozevep.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/semamogoxabivufire.pdfIn PDF document text
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/6261556819.pdfIn PDF document text
    • http://placc.info/up_image/fopatigesutubewexofirak.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/56a24f244a89280315f802186d745723/57743439847.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/jepemipozabapive.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/msqolkelgnpgima5ltvooqfenq/80448075110.pdfIn PDF document text
    • https://ville-saintleonard.fr/pdf/suwufogonasunezozotapizo.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c122561831e---25540549282.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b45fa97378c---xejitazuwaxejukoz.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/dadumutafefetusamurebem.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/bjbhvhmtvf48nefqsj9a7fldo8/patanigawase.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/vezotom.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16103c9bfb66e9---75315634594.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=acronis+disk+director+11+home+keygen+free+downloadPDF 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_off0000cb1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB1C 16404 bytes
SHA-256: 2094caed1650bd60d7ee15f35058fb0596984fff9ea3d2eace5133ab10faff4f
font_01_sfnt_off0000f5b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B7 11248 bytes
SHA-256: abf802723febf34e822b1eb4955be54af82242ae21e09f7144bdfe69432c3990
font_02_sfnt_off00010fe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1