Malicious PDF — malware analysis report

Static analysis result for SHA-256 f973d8907872ba53…

MALICIOUS

PDF

83.3 KB Created: 2021-09-17 04:03:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b5f13806f5450345c53af84758d682da SHA-1: cfbf84a9ae4d82b820a184d04c9c395174d689de SHA-256: f973d8907872ba530fa9d48586cf32e87ccc5ad0da8d7273c80b176eb3e63bd7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The primary purpose seems to be directing users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/951e421c931fda7b665da5cc85e6a98d/ralonu.pdf In PDF document text
    • http://studiotecnicoligioni.com/userfiles/files/60639556419.pdfIn PDF document text
    • http://baby-daycare.com/uploads/files/202109020454296120.pdfIn PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/75193399578.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/zonudevuvebovopolexonesil.pdfIn PDF document text
    • http://www.w.radeton.cz/ckfinder/userfiles/files/35916312121.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/guxasexajabitopeme.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/71283912934.pdfIn PDF document text
    • http://wawa757.com/uploads/files/53367685046.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/33e75bbb974862a3b1f5e1fb4b8e00b3/4113197975.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/mulixipe.pdfIn PDF document text
    • http://filippodelvita.com/demo/userfiles/file/60294332348.pdfIn PDF document text
    • http://eca.or.th/ckfinder/userfiles/files/pivunosewevotuvawozakow.pdfIn PDF document text
    • http://jl-vacuum.com/upload/files/20948584557.pdfIn PDF document text
    • https://malinaionescu.ro/userfiles/file/8075405936.pdfIn PDF document text
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137a1114b607---41177224288.pdfIn PDF document text
    • https://sofupingame.com/calisma2/files/uploads/90444361232.pdfIn PDF document text
    • http://importfoodfair.com/userfiles/image/2021/09/file/mibaxojaxinudamirovize.pdfIn PDF document text
    • http://denki-shonan.com/uploadsfile/78962447659.pdfIn PDF document text
    • http://dvif.fr/userfiles/file/vogotur.pdfIn PDF document text
    • http://universalestetic.com/userfiles/file/fosarepi.pdfIn PDF document text
    • https://drbumbnursinghome.in/ckfinder/userfiles/files/bevadumatokope.pdfIn PDF document text
    • https://jajugroup.com/ckfinder/userfiles/files/99890046798.pdfIn PDF document text
    • https://nisahanpin.com/calisma2/files/uploads/mozipukumuwafutifug.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/161384f1488f88---27939708922.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=hide+device+id+androidPDF 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_off0000e25f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE25F 10108 bytes
SHA-256: 64a7ed9d6401705b8a212800569ea71bc878585e0490a6bdc9e84026c8a2fa0b
font_01_sfnt_off0000f8f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11107 17764 bytes
SHA-256: 467c881cc0330b850d06e986220574bd0ce7dabf0081a5df74a038250ea4dda5

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