Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5f60e561d9e5968…

MALICIOUS

PDF

74.1 KB Created: 2021-09-08 17:18:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5893094cdd111f18ffaf6cd48ee52daa SHA-1: 658a2290ed3250c218f17b81a0f50d1aa87e7044 SHA-256: d5f60e561d9e59681d80f6725e5c0c27e27864a96bd3eb7c0cec8890800830e8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://art-gallery.mn/uploads/files/gowubotoroguvet.pdf In PDF document text
    • http://houselandia.ru/files/gejogawexazo.pdfIn PDF document text
    • https://eijo.in/ckfinder/userfiles/files/39340445416.pdfIn PDF document text
    • http://currycornersugarland.com/admin/images/file/xobog.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/gagorefofi.pdfIn PDF document text
    • http://w-w.cn/isee/pfm/cms/uploadfile/fck/file/dedalajeturogozom.pdfIn PDF document text
    • http://c-six.it/userfiles/files/sokudat.pdfIn PDF document text
    • http://lagrupacio.cat/file/puxadovetogodarod.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/161359033c02bd---rezelepi.pdfIn PDF document text
    • https://meritumptt.pl/dokumenty/file/lofufibovuwalejisixog.pdfIn PDF document text
    • https://tatvan.in/userfiles/file/14945119323.pdfIn PDF document text
    • http://jenan.com/ckfinder/userfiles/files/samosata.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/gubegolivorodoxu.pdfIn PDF document text
    • http://synergyproperty.com/images/files/64158578848.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131b003a7ca0---49030053185.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/7e6ebd65364bdf539af76514de2ea9e8/90956063903.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/10b4473b9f4367dae738c88d2029800c/81206412628.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/vasenigoraxuko.pdfIn PDF document text
    • http://lauraestetica.com/userfiles/files/madubi.pdfIn PDF document text
    • http://www.enredmail.com/templates/files/idCliente_/file/moxavoborugipibipiro.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/6f9d3631fc9eab63734f0836d6685bbc/44178326896.pdfIn PDF document text
    • https://comillaspostgrado.es/userfiles/file/82229161173.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/walokugurumuliderowitopix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=weeny+free+pdf+to+text+converterPDF 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_off0000c084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC084 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD896 16348 bytes
SHA-256: be91c7cdb8594afa4f5d8b46905059d64c35937b76d5187671754841427d42be
font_02_sfnt_off000102cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102CD 10420 bytes
SHA-256: 32a39843eebba1f47da61c63d889b2f690179a4e313b0bf00d9b2e77551d1d75

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