Malicious PDF — malware analysis report

Static analysis result for SHA-256 c495e52b50cefb75…

MALICIOUS

PDF

91.8 KB Created: 2021-07-26 11:36:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0b5321055d024846b078dc6fef1e457b SHA-1: c614798200fd1e2ca52fc7af94d101bc74d26839 SHA-256: c495e52b50cefb75bf5c3b631df6cd76bbc195f202942f8571c9ed5cb7d74e80
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to lure users to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9932

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://newtech-utm.pl/userfiles/file/biridawomabasu.pdf In PDF document text
    • https://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/00918be375c670de28e3758ae2c820e1/xapomato.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/a8379287d42de18d248723c6b14c55a7/jusowebamulabo.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b7efa16e07b---tipolozorezowad.pdfIn PDF document text
    • http://creatinglifeoptions.com/userfiles/files/lofozataj.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/de2de88d072cecc3170753a4788a6efc/78705306226.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a6286faca0c---volag.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aab2dbb7e8a---xititizivorojiw.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/nufovutufelo.pdfIn PDF document text
    • http://bigband-ulm.de/userfiles/files/dinapapagozadexer.pdfIn PDF document text
    • https://onlineadda.net/ckfinder/userfiles/files/57246202628.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd522b9de67---jexujokokanewenegisof.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/zanaralo.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/7445137984.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/96457321496.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b8e981fc8---buxexitadedevebisud.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/3k4572rqh6ofqtbf8jem0ifogo/nawomedumu.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/f9320911b8a1bc09e2dda05dbfb845fa/niminagobe.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/49245900670.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af5eaf6b5d5---ruvipebe.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a5878ca580e---pesisonobipoju.pdfIn PDF document text
    • https://haysalon.com/public_html/userfiles/file/xobajawovurikezipufawesi.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/48567548ba95428d7fbc3e07574db1da/22923839920.pdfIn PDF document text
    • https://cuisinescartier.ca/upload/editor/file/wosegijetomexenuxeluva.pdfIn PDF document text
    • http://galgalesh.com/userfiles/file/guxigijirevifumozoje.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/33235988736.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=filmora+free+download+softonicPDF 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_off000104c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C1 16616 bytes
SHA-256: d88e3c408bb677b0801ab806a468f2ff989215c82d2d4c33fb99921a7e3c489c
font_01_sfnt_off00013024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13024 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001483b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1483B 10700 bytes
SHA-256: 2e5bf02d0e5a0f71177fbc6f2d79153a401a19dc6530c0159e3ac6f6e68f617d

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