Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dc4b87c3869e819…

MALICIOUS

PDF

83.2 KB Created: 2021-09-18 12:33:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d4b2310857f928aca9c819152b58ba7b SHA-1: fc0878f91c9ecb8d80e0922f7f710d4b7377c328 SHA-256: 1dc4b87c3869e819d3c3fc28e799bfa37cbd284f9751a0aec16f3633272d9b9b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external resources, many of which are hosted on compromised or disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://www.maderas-navarro.com/ckfinder/userfiles/files/vivevujopiguwuwuvojap.pdf In PDF document text
    • http://kleinschaden-expert.de/userfiles/file/silofilinaxuweladu.pdfIn PDF document text
    • https://www.dooleysnaturalgas.com/ckfinder/userfiles/files/36579518456.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/89c07a0710261bac1f7226a6fa625c57/zodelegawevu.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/ruxibikijepot.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/tobaravediwolodavon.pdfIn PDF document text
    • http://rqconsultores.com/userfiles/file/nulamomokujupujasegito.pdfIn PDF document text
    • http://group-anons.ru/userfiles/files/81969301357.pdfIn PDF document text
    • http://gzmzwl.com/Uploadfiles/files/28880932409.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/15388067488.pdfIn PDF document text
    • https://www.hotel-restaurant-plainfaing.fr/ckfinder/userfiles/files/kizilutupokujosomikonen.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/78763896701.pdfIn PDF document text
    • http://mastrodibaglio.it/userfiles/files/zejekenaduvakisuzezorisom.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16142bdfe9d315---26525606401.pdfIn PDF document text
    • http://sweed-trans.eu/ckfinder/userfiles/files/ridopukokeniribatinuxij.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/9e858e2371a28315607f7f796820af7f/vavakoju.pdfIn PDF document text
    • https://siliconautomation.com/userfiles/file/41012570973.pdfIn PDF document text
    • http://domingo.hu/ckfinder/userfiles/files/pifafepisorodamaxepa.pdfIn PDF document text
    • https://fullprotec.com/ckfinder/userfiles/files/45277950090.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/sigapezewoke.pdfIn PDF document text
    • http://lawyermo.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fowelajilevino.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/sumopijukimasexinerusalen.pdfIn PDF document text
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/genima.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=download+metamorphosis+by+franz+kafka+pdfPDF 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_off0000d7c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDD 11256 bytes
SHA-256: afe5ffff02bde86ec4e786cd4096b57fefaa1729a289e4f5e8c87240fd52d90f
font_02_sfnt_off000109e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109E7 20308 bytes
SHA-256: 28345ad9a91f8238e6c073ae3cd3ce9271b39bbecd0a41bab20322b0e98d0211

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