Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cd00ec1578fc262…

MALICIOUS

PDF

87.5 KB Created: 2021-07-02 10:57:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 57caefd92790e36fd4ea56be66ced54c SHA-1: 16d7aae7678bee9b06bb1d383dde802d8c138794 SHA-256: 2cd00ec1578fc26213399b725dceb4095ab9daa61e34a738d87ae2d43758e775
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links hosted on compromised WordPress sites, indicating a link farm designed to redirect users to malicious destinations. The ML classifier strongly flagged this PDF as malicious, and heuristics identified it as a link farm on disposable hosting. The primary goal appears to be directing users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 5

  • 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://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160857d49d1794---vewufuzureteguz.pdf In PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1609867f98a49e---buwevikexaduzenetibijuwo.pdfIn PDF document text
    • http://wongkungfu.ca/clients/f/f5/f5c316b966f29b3192b3e9e3c5714b3c/File/bogorododiju.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1ece810ab---bimonapiloleluzebo.pdfIn PDF document text
    • https://activepymes.com/pub/file/62189056486.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/25c197ae5bd60cc8864d7c58750f5901/12594588289.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160afa7e174f2e---ratexipiwololiw.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/s9cjsv68lhivvr6i4kk4o5kv2s/23143811202.pdfIn PDF document text
    • https://www.lashharmony.co.uk/wp-content/plugins/super-forms/uploads/php/files/6u43tfq58j1j0ehk229prfim25/63117347976.pdfIn PDF document text
    • http://technoculture.cz/admin/upload/file/13265749078.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d493f59abd5---binuxel.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f40c17e4a5---nafotisudifirotifobiwo.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/4fandi0cfofe8v44n2kjtj70r4/83356786229.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/13f85e13e5d14c3d2384bfc5fb8f0ba0/dufufixuro.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609382496073f---pavuvat.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/160863e1457573---zulaxerigatijuvulusurose.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160832eee7bd98---sazamijuzesizenazapa.pdfIn PDF document text
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/rusewunaxerefi.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/dfc22cb12f4b94e70bc65101261719e9/84532240741.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/faraxufovisa.pdfIn PDF document text
    • http://canxetaianhduc.com/images/file/ruxukimevuruf.pdfIn PDF document text
    • http://richiefamilyreunion.com/clients/7/7d/7d03816b951c94fc7c065ced7c7ccdcd/File/xazimogoziniladasakadi.pdfIn PDF document text
    • http://alhouti.com/userfiles/file/81645827576.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=boiled+egg+cracked+in+waterPDF 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_off0000f321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF321 10608 bytes
SHA-256: 439cd1363e17b043ab0b1c19cba10c5bc6d22b26ce4061a2f93d964cf35825ae
font_01_sfnt_off00010b5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001236c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1236C 17684 bytes
SHA-256: 077a4280975d0caf3799c6337540947537e235ab7f72db865e0fd6905bead5f1