Malicious PDF — malware analysis report

Static analysis result for SHA-256 08127b7e43013fda…

MALICIOUS

PDF

76.9 KB Created: 2021-08-02 21:25:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 41bef20fd5da293eceedda70558391ce SHA-1: 2313226abec7ebfeca8a2ef276aa5e91fd4183d7 SHA-256: 08127b7e43013fdab0d7f2244d4f111dfca7cc91fa08ce72d27625625a85426e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous URLs that form a link farm, likely directing users to phishing or malware distribution sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically points to this behavior, suggesting the PDF's primary purpose is to host these links.

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://inwebjor.ru/uplcv?utm_term=whitefish+blastula+mitosis+lab+answers PDF link annotation
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/4e866dd4e92471819e7a2b88d08d981c/70078076704.pdfIn PDF document text
    • https://sunnyvale.com/wysiwygfiles/file/20816889346.pdfIn PDF document text
    • http://expertsystemgroup.com/file_media/file_image/file/14478257333.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/55579392324.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///dufamomavegenepodo.pdfIn PDF document text
    • https://brazilairporttransfers.com/ckfinder/userfiles/files/82069246960.pdfIn PDF document text
    • https://cosmopolitanhotel.eu/uploads/wysiwyg/files/38016687297.pdfIn PDF document text
    • http://giaodantanthaison.com/Images_upload/files/12595541382.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/32631831567.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609cdcd543373---65375815965.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/9a160726ddaaecc7d51fb5e8e8b10fd8/ladavodilufabub.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/57v7l8jvdou791efmpqse4a5t6/56352856048.pdfIn PDF document text
    • http://weclassof86.com/clients/6/6d/6dc59c75684a9be5e3a4726337e2fa3a/File/59193349779.pdfIn PDF document text
    • https://faltprasten12.se/anvandarbilder/70/files/vizesejeked.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ebb9e25463---12046850447.pdfIn PDF document text
    • https://successstudio.net/userfiles/file/lowenudagufenegixi.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bcabd8aed43---wiletalenejuwuzunulanake.pdfIn PDF document text
    • http://win-sonic.com/kida2018/ck_imgs/files/poxasilisunamafa.pdfIn PDF document text
    • http://champagne-marc-chauvet.com/images/files/rudoxivomi.pdfIn PDF document text
    • http://firegallery.ru/img/upload/4026116717.pdfIn PDF document text
    • http://bomtvplus.com/data/board/file/20210620150439.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/rowomo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1fe6e1454---pevixakuzekunovelijabiz.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_off0000ca5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA5E 10800 bytes
SHA-256: 7dcc08eaf93ba4e54f6a49b055ed41072fb2a0090536ebc19cc169568fd46f36
font_01_sfnt_off0000e320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE320 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB32 16128 bytes
SHA-256: 68a6dff78c6c0d78e0af1cb3228f7e366ef57f59e52bef06c84970d0a6b8dcda

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