Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2c3f95acc33453d…

MALICIOUS

PDF

78.4 KB Created: 2021-09-05 18:38:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3a0194ac2cb4954fbaf71838b4a0c122 SHA-1: 431fe1f8efe42fb732d7e17cd7e617815596d127 SHA-256: d2c3f95acc33453d39de05fe06780ee7ce9f732337e1e6a90d3cfc931f3f8117
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external URIs, many pointing to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://philabc.ru/uplcv?utm_term=philip+pullman+clockwork+pdf PDF link annotation
    • https://www.bmo-agencement.fr/ckfinder/userfiles/files/sapibidavaseno.pdfIn PDF document text
    • http://recko.ru/ckfinder/userfiles/files/jafojeteguvezogerilazuxev.pdfIn PDF document text
    • http://classtool.info/upload/files/1134933709.pdfIn PDF document text
    • http://thebankcardservices.com/uploads/files/gemorivebajelefoja.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-5-1/20210501152425447530.pdfIn PDF document text
    • http://sonkertrail.org/clients/9/92/9260a3c387aed4615f72c72c3a1da295/File/sebuli.pdfIn PDF document text
    • http://pressvaluation.net/FCKeditor/editor/filemanager/connectors/userfiles/file/79114866857.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/cd484f2dd8e2e79aaeb1dc644f10e756/gimowo.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608787fd30118---15204630848.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/dce1a1cd53e919e8c3f891254cd176d3/24048622628.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/a54b108d0e63b064c39d69b12d911aed/24888821927.pdfIn PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/81674085205.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/160724a3d7738d---75226917870.pdfIn PDF document text
    • http://aotwresort.org/ckfinder/userfiles/files/70115995135.pdfIn PDF document text
    • https://cavalier-hundezucht.ch/userfiles/file/viwajuxopi.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160962e934b890---5200258028.pdfIn PDF document text
    • http://bukharaatlanta.com/sites/default/files/file/nupezemanusuromenatoga.pdfIn PDF document text
    • http://oxigensupplies.com/shipinc/userfiles/files/94826846466.pdfIn PDF document text
    • http://vimar.ua/userfiles/files/67953711240.pdfIn PDF document text
    • http://absigorta.come/file/jagojawaxo.pdfIn PDF document text
    • https://penal-garazh.ru/files/26051186413.pdfIn PDF document text
    • https://psystat.net/candyticket/uploads/page_images/files/60045561758.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_off0000ce3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE3C 10768 bytes
SHA-256: 5224a1935b3a92594b00b9b13442dec1ae6908323720f5c1631e2b9efcb55936
font_01_sfnt_off0000e6c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C6 17288 bytes
SHA-256: 7f2571d2af201bf14b1326d53a0413ea65529102fe5b36bfad022b47e0f003d7
font_02_sfnt_off000113f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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