Malicious PDF — malware analysis report

Static analysis result for SHA-256 7fe6f9cdb20a20b4…

MALICIOUS

PDF

79.4 KB Created: 2021-08-16 09:14:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f63db5c7599af7c9d3a968e9b91c8ab1 SHA-1: 1cd9e52475ac5c7ae4b071b9302c5aaabd874eb0 SHA-256: 7fe6f9cdb20a20b47e3161d8ccf8125d6d310825462d5ffeb14c1c2afde7abbc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress upload storage and disposable hosting, indicating it functions as a link farm. The presence of embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggest the primary purpose is to redirect users to potentially harmful websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://binarbaid.com/public_html/userfiles/file/69336703911.pdf In PDF document text
    • https://latework.cz/soubory/76750742087.pdfIn PDF document text
    • https://sgcaregiver.org/contents/files/64868021901.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/33159494827.pdfIn PDF document text
    • http://originalavto.ru/userfiles/file/kesekuribibulorog.pdfIn PDF document text
    • http://holmeslawfirm-iowa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/turezadowawijop.pdfIn PDF document text
    • http://ufnk.fr/app/webroot/files/file/84760383896.pdfIn PDF document text
    • http://dexgerm.com/data/file/userfiles/files/wezomugexijugel.pdfIn PDF document text
    • https://mihalex.by/files/files/35295324937.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/tadenedubuxe.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/16083ece4cfd1e---xolodajenivofezirez.pdfIn PDF document text
    • http://mid-europe-ex.com/images/blog//file/xuzigonigimisofagusifus.pdfIn PDF document text
    • http://willbramephotography.com/badomajuzuxep.pdfIn PDF document text
    • https://birsamundapark.in/userfiles/files/nifad.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/21639505439.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/q2itnb0p2hata7p0ulqg5i48cm/22658949826.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ad9890ecc6c97c262a94a7c26010d438/53486723021.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/37ddf5e93dc0239f34a06f86ddf91fe2/51035773576.pdfIn PDF document text
    • http://www.ccengis.be/applications/ckeditor/addons/ckeditor/ckfinder/userfiles//files/sajezapokomi.pdfIn PDF document text
    • http://aptchasers.com/FCKeditor/userfiles/file/85152232596.pdfIn PDF document text
    • https://vvpta-irvine.org/userfiles/file/58135485647.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/914498e87c0d7aa3ac8689cd91ce3669/tobisur.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609b08f364362---levudejuv.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/39d63505b44bffc563f366420d5db9c7/kebovamusaduxa.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/puwilabogop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=pelicula+una+estrella+en+el+ejercito+online+espa%C3%B1ol+latinoPDF 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_off0000d0cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DE 16956 bytes
SHA-256: 4a6750c1c4ee382d44bc25dfec22df8ba88c90a08ec81a601c55747d6fa911a5
font_02_sfnt_off000113aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113AA 10804 bytes
SHA-256: a4f9a1847272921463a5512ff1e9cf47f95e11213cce37a999317f4dcce2dd44