Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f190949f8cae86d…

MALICIOUS

PDF

97.7 KB Created: 2021-09-03 01:24:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 361416513d4ba9b49ddeb307678ecbae SHA-1: 1bb25c6287e00ebdcd91a35feacc87e9eda0ad3d SHA-256: 1f190949f8cae86dedc79de1a4dcefce86d12a4b27ebc711eefa843c8dcd7ced
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URIs are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://cructi.ru/uplcv?utm_term=legal+and+ethical+issues+in+nursing+6th+edition+pdf+free PDF link annotation
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16074c6d3abbf0---74496420759.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d23a53513a3---26490791838.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/88236828092.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/1ecddfd17263384f25e212e0c1b7970d/jixudobunugibosemafunoz.pdfIn PDF document text
    • https://wita.lt/images/files/lagava.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160821917dc377---wonawifeni.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/94801652468.pdfIn PDF document text
    • https://tivicom.vn/upload/files/96931314761.pdfIn PDF document text
    • https://cursosgratuitosonline.es/wp-content/plugins/super-forms/uploads/php/files/6enmuq8ch71d6rmeng3pg00kak/gubekodufoniraweroletak.pdfIn PDF document text
    • http://werkkledingverkoop.nl/images/docman/files/sagusiruluwufifi.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/77894208533.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a665145e2d0---saduwibenimaturax.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/tojovizusi.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/28517542822.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160ab0f0a8eb7d---muwabo.pdfIn PDF document text
    • http://hansungidschool.com/userfiles/file/24944903289.pdfIn PDF document text
    • https://vidaleve.ind.br/ckfinder/userfiles/files/fusamobupezojame.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a59c7a1a5e5---80188559940.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610f7f28c17c0---32037151709.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/386397a632aaf897055cc31fc10d5928/99440591070.pdfIn PDF document text
    • https://rumusjitu.com/contents//files/91228396589.pdfIn PDF document text
    • https://kar360.com/resimler/files/38470480200.pdfIn PDF document text
    • 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_off000116b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B2 18436 bytes
SHA-256: 750ba79e32459db05ee6849541a58429b84cc1f79e4b92f20db9aeeb937054f9
font_01_sfnt_off000146e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015ef8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EF8 11124 bytes
SHA-256: 4acb2f3a1ebf118710fa6a93e99335f9fd65c9e827b9793815299f5355b47740

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