Malicious PDF — malware analysis report

Static analysis result for SHA-256 48851c1f65cfdb8b…

MALICIOUS

PDF

102.1 KB Created: 2021-10-06 09:31:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 1db8463c6bb995100b2d37c98be3bb2c SHA-1: ffab968996dbd59591f6febd2998c5633252d75f SHA-256: 48851c1f65cfdb8bb85e2b7198f6cdbdfce281deead2b1770f75606c12102174
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm with numerous URLs, many of which point to compromised WordPress upload directories or are hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary function appears to be directing users to potentially malicious content via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9790

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://nathulaldasptti.com/ckeditor/ckfinder/userfiles/files/55768828280.pdf In PDF document text
    • https://refakatci.net/userfiles/file/senezetutevi.pdfIn PDF document text
    • http://naitikfashions.com/ckfinder/userfiles/files/13235398532.pdfIn PDF document text
    • http://asesorgubernamental.com/images/file/dujekaxibajosagafisoza.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16148fb3c8e0e6---depejerivekilaruxefugidel.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/f9c96d0431ce82898c7e82f7fbdb28dd/64670139589.pdfIn PDF document text
    • http://wasserentkalkung.at/ckfinder/userfiles/files/91367502547.pdfIn PDF document text
    • http://studionegrelli.it/userfiles/files/17815279490.pdfIn PDF document text
    • https://canoe.ro/Extras/ckfinder/userfiles/files/kifakanunoletikaneb.pdfIn PDF document text
    • http://adriennemason.com/assets/files/50669640660.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd55f75210---133351674.pdfIn PDF document text
    • http://hotelrealerimini.it/userfiles/files/30440038698.pdfIn PDF document text
    • https://doanhnghiepvietnam.niengiamdoanhnghiep.vn/img_duhoc/files/faxot.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/labofeju.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16159b139ee3f1---rodifivotenef.pdfIn PDF document text
    • http://ghettaetamionarchitetti.it/userfiles/files/34237136582.pdfIn PDF document text
    • https://peoplesmodelinternational.com/ckfinder/userfiles/files/latisebaxumaxurugi.pdfIn PDF document text
    • http://manavpublicschool.org/manav/userfiles/file/16564760539.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/97443732502.pdfIn PDF document text
    • https://repetitorebi.ge/userfiles/files/20170971060.pdfIn PDF document text
    • https://www.eos.org.eg/ckfinder/userfiles/files/76608965187.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613958b2d4b6e---nakonukigemunimibume.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/82798277418.pdfIn PDF document text
    • http://peetersinstallatietechniek.nl/upload/files/36474539013.pdfIn PDF document text
    • https://polnische-zaune.de/userfiles/file/vudakovaboxenebijure.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615599008e62a---85429446158.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=dotnet+swagger+tofilePDF 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_off0001232c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1232C 21524 bytes
SHA-256: 946edc8652ef871a8c929960bec00f0a1eb09592ebf1f404ee9794f98e17b225
font_01_sfnt_off00015b0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B0F 10476 bytes
SHA-256: 243117ad6c3484814f6ff503fe0170d54c8933266b416cc1ba3f66eb38fcc1cd
font_02_sfnt_off00017313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17313 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1