Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce3cb26e3fcfec61…

MALICIOUS

PDF

81.1 KB Created: 2021-09-07 18:19:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2ad0099c9f36266973df9e59e0b082dc SHA-1: d35d9ae750de78fd9e0ff21e583c8e78d7929047 SHA-256: ce3cb26e3fcfec61c23dc25bb81744870abed84a867b442464c256cf68b2494b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites. These sites host other PDF files, suggesting a multi-stage attack or phishing campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, further supporting a malicious intent.

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://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3abc48b6be---57874200159.pdf In PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/b1b5318131d0b0ea77060ff85b7c3cbd/fololegebasadazuxav.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607742e395606---jagejexinobevetuj.pdfIn PDF document text
    • http://renovator.cz/files/file/92484067896.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/65759260946.pdfIn PDF document text
    • http://yourtruck.be/upload/ckeditor/file/90019120518.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/383e0709f5e683046fd5e73d0964186b/37090741965.pdfIn PDF document text
    • http://gr-chem.com/upload/files/mazolet.pdfIn PDF document text
    • http://15889163.com/ckupload/files/jizise.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/45e2830553ce2e59df5c7a0830381845/88997923549.pdfIn PDF document text
    • http://eviljoy.com/UserFiles/File/7692212734.pdfIn PDF document text
    • https://starbox.fr/img/files/18961714140.pdfIn PDF document text
    • http://araonline.hu/uploads/file/nukikazozuweximexuwatuxu.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612a8affa15bf---budizovowaxarew.pdfIn PDF document text
    • http://autowagon.it/userfiles/files/kujigarolixu.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e234c523ee5---61962788633.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2a7302c4e---xofibadotaxib.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/mdsr6pmuberpnr07ojr7eljbjb/dajugefiwejadej.pdfIn PDF document text
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd551371999---79754911212.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/e2573af9b7f138a5dfc4ebbf0eb08be8/fapuzomifavazegapuzon.pdfIn PDF document text
    • https://khangle.vn/uploads/images/files/47312386088.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161204ef0c69e4---53156266775.pdfIn PDF document text
    • http://natur-pet.cz/webpagebuilder/ckfinder/userfiles/files/motoxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=restriccion+selectiva+del+crecimiento+intrauterino+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_off0000d6bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eed6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED6 10992 bytes
SHA-256: 66a87c4bf2f521829b3f2093f9c928c31124ce808ef9a891f5e7698a80570c48
font_02_sfnt_off00010860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10860 18200 bytes
SHA-256: 4c5e4859ce0faa829e0f188582d1d6b9c7c24dd2dcad097a257ab8f20f347403

Open this report in the interactive analyzer, or submit your own file for analysis.