Malicious PDF — malware analysis report

Static analysis result for SHA-256 25ad840ddec2aa9a…

MALICIOUS

PDF

214.3 KB Created: 2021-09-05 14:00:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 999bbccde3d962e10b75db58ccc7c6a2 SHA-1: 437acc0428de68d30cf99dd3380ba113d3b79298 SHA-256: 25ad840ddec2aa9a4b38149a1db5b57d62697661df10d7eb1fd53684763e0952
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document that contains multiple links, several of which point to compromised WordPress upload directories. The ML classifier and ClamAV detection indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the presence of embedded URLs and the heuristic firings suggest the document is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7586

Heuristics 5

  • 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.
  • 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://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e6734315af---24407281082.pdf In PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/fidivadixurukadawud.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20210710082423_zc28g4.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/eoo76lclmdfg1plibaplpbdkd4/vitajakuzanisot.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1610dd48cc1e34---xidesisakarap.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/17791975186.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/991a51448560b9ba6d896581cd54da5d/21902210196.pdfIn PDF document text
    • http://dc-536514926e84.632.ch/ckfinder/userfiles/files/70630586306.pdfIn PDF document text
    • http://food-cloud.com/home/food-cloud/www/site//site/data/files/84480056553.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16070511d3f842---kudidotizugojenokumabe.pdfIn PDF document text
    • http://www.gdchgs.com/admin/img/files/miginuron.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/0173a4578d5f9e055c60351b840971dd/bimixopofagubuninef.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/gawibara.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f0c576928---53390755113.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/popimemomobu.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/38448106845db3dca6a5e268fb7523e5/wogujeratizidat.pdfIn PDF document text
    • http://foxhill101.com/userimages/55074673494.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/mizotobilokuz.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/49924795676.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160851c0cedb13---povojebij.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/32531189467.pdfIn PDF document text
    • http://asude.istanbul/ck_images/files/33602756179.pdfIn PDF document text
    • https://voyagerf.ru/wp-content/plugins/super-forms/uploads/php/files/8e88f46c80aed2f4ada16bd2a5b324a8/44038566238.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/oierljidb1qbridtf2qfs6goj4/xopepepopezolalutoji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=manual+de+interpretacion+del+wais+ivPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002b560.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2B560 10752 bytes
SHA-256: d2d20e20e24d324b1e27406d88043092482dee490e8b921146fd0c64bf5f309c
font_01_sfnt_off0002ce3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2CE3C 16160 bytes
SHA-256: fa5cbea137587b1d4bb1c548ff3f8d17a18587fe273de630a8d80f12e69f99e4
font_02_sfnt_off0002e3d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E3D3 26592 bytes
SHA-256: 8e7ba0271f69e3d4914914582ae0916890957b1ed6d3c2895a1da833ef555aaa
font_03_sfnt_off000326d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x326D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00033ede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x33EDE 1964 bytes
SHA-256: cb83427253be486b5dc35224710cea1d2a27078ad6da64da340d8beb93dbb3aa

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