Malicious PDF — malware analysis report

Static analysis result for SHA-256 4300b298ebf03a42…

MALICIOUS

PDF

79.6 KB Created: 2021-09-07 18:21:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 681b7ceec4b8b64edf1320a414c66fe4 SHA-1: 30bd058fa46121ce7fd65bd3e15a93f609a5b41f SHA-256: 4300b298ebf03a4289bd15f2a7b5e91edf991b74e92da553a9e728be3803931d
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various websites, many of which appear to be compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating link farms on potentially untrusted domains, suggesting an attempt to drive traffic for malicious purposes. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://catamma.ru/uplcv?utm_term=contitech+hose+assembly+manual PDF link annotation
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/15423061002.pdfIn PDF document text
    • http://thietbimaugiao.vn/Images_upload/files/69300935051.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9cf681b21---33442522980.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/ragovalutuxasilawajat.pdfIn PDF document text
    • http://londonjip.com/userData/board/file/juzakofafojibaduwevidubo.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/gifowakalarubivugevata.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160982f5161ef5---34116945827.pdfIn PDF document text
    • https://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/42b1bd967252e9038c8676c91bef53f4/vugorubave.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a497cf78fd2---48062734469.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612e5ff37e83f---71225012511.pdfIn PDF document text
    • http://sochisushi.nl/survey/userfiles/files/74721531970.pdfIn PDF document text
    • http://thechelseaff.com/user_uploads/files/10342635582.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/90ddd00828df05825680bb0685fc875e/579661767.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/nudazipiloxojo.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/57092766869.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d57821f804---51367839242.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16089ec0acbd2a---36697181178.pdfIn PDF document text
    • http://orhs76reunion.com/clients/30721/File/kowifalogafuserol.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609939b2e4b1c---31433798529.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/4796596859.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/juwuwezazotekef.pdfIn PDF document text
    • https://eastmangroupllc.net/ckfinder/userfiles/files/jubigomunosiganugapi.pdfIn PDF document text
    • http://hotelstrack.com/bot/ckfinder/uf/files/24312779160.pdfIn PDF document text
    • http://crossfit28.com.s125853.gridserver.com/siteuploads/editorimg/file/netulirarulujal.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_off0000d096.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD096 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AD 10780 bytes
SHA-256: 0fa0b6c9efc9092ec1665fef112277b18370f180072d93602603e5c008e5282a
font_02_sfnt_off00010160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10160 18160 bytes
SHA-256: 25a16f8d288fad3d78d9d8184596d3c53bcddb0a2d66f870cde506f6fba67ad0