Malicious PDF — malware analysis report

Static analysis result for SHA-256 40048cf6c324d93d…

MALICIOUS

PDF

138.0 KB Created: 2021-07-14 02:30:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 614c399586836060bfcf5ac5b1ba7024 SHA-1: ddb019888cfd7a9ebb10485012c316083f4f1fe5 SHA-256: 40048cf6c324d93dca0785e58c5d9d0ee93e310d50c43c28b5310cc39d6f41b7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites, likely intended to redirect users to phishing or malware distribution sites. The presence of embedded URLs and the nature of the heuristics suggest an attempt to lure users to external resources, potentially for credential harvesting or further infection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9727

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://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/3hv3gdt4fnn9782h5si0l6cf8n/59899152392.pdf In PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d20efa8916---dudefakidirasurekijateva.pdfIn PDF document text
    • https://valve-toho.com/userfiles/file/50923624462.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d22484b786c---44357704187.pdfIn PDF document text
    • http://togetherwewalkny.org/clients/2/24/2411cc079aa0f0d7fd57f81c6163ecfd/File/ruxeto.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16082f9b17e582---jivuwuwenejanowoxo.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/755c238477acebaf6372439d5d58b0b4/gomibimapelunewajusuka.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c9ef44b8fed---vaxudixosewizazotovi.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/kaul9chtpqc8q327uo7ov56631/63655019044.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a9c891a9a06---85990818681.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/36ps5euh8uk9oblj640980efj2/18212463369.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/da5ebe7e7989369ee6bdb12e90b6eaa2/tuxofedozew.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/61tu78nqmu3nequ114mmgncm44/wiguvifuvelubiwob.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/kipaxalezekevunoze.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/dugazoraxebijapuxijugoxaw.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/e310c5599371b4081c1f65cbb20d3164/govuxobapoke.pdfIn PDF document text
    • http://eventcompany.org/clients/e/e3/e30ef11cf4efe639fe6592aa37b9cb94/File/84883068057.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/bf455257170c8915a2cd3279de9e7ff8/35750098022.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093f72c9873d---56093243330.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607080b4d430c---92254129052.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb8b6168b7---melasusakusakovolafele.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/ipn68hlg8qd2t88rfk5bg6u8lb/riditob.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b60c4b847d---filosedesefomepul.pdfIn PDF document text
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/5noh6j6q4iu5d33coqejhsb8t0/46408294430.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/furefowewilenodimaju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=general+chemistry+conversion+chartPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00019926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19926 16108 bytes
SHA-256: d0eb2f76bb0702b75bf5f25506cd2b7030fc50cdab4ab9050a33867219fee3d6
font_01_sfnt_off0001ae6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AE6C 22256 bytes
SHA-256: 953f5c848f2fde6b06dda1119f973e231247cbfb3ca837b703431f684366490b
font_02_sfnt_off0001e932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E932 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00020149.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20149 10712 bytes
SHA-256: a9a61d5e76769668c8f32e3cff71cd78eb265aac2d8abd47e23ffef274ee3a98

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