Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d6381884f0b954c…

MALICIOUS

PDF

69.8 KB Created: 2021-09-24 14:15:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 291031e5e2104d8784038b692c6c2847 SHA-1: fbe097ce40a87bc843c2823066efa909cd3a0f1c SHA-256: 0d6381884f0b954c930ced83d3e43a848043f4248c7cdb09ccaa6256ab9c9f6d
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, including one pointing to a compromised WordPress upload directory, suggesting it functions as a link farm or phishing lure. The presence of multiple PDF-specific heuristics related to URI and link farms further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://laborke.ru/uplcv?utm_term=naruto+senki+by+doni+alvaro PDF link annotation
    • http://jandenzobv.com/image_uploads/file/bobanow.pdfIn PDF document text
    • https://piauiaqui.com/ckfinder/files/lexatosobakuwim.pdfIn PDF document text
    • http://moda-minulosti.cz/docs/momin/file/6965236187.pdfIn PDF document text
    • https://sindicav.com.br/ckeditor/ckfinder/userfiles/files/67355007177.pdfIn PDF document text
    • http://harekatmemuru.com/images/Media/files/wofixaludolefi.pdfIn PDF document text
    • http://eia-edu.com/userfiles/file/54033618457.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/161453909c4dcc---52001335134.pdfIn PDF document text
    • http://thebrownbag.vn/upload/files/nabazij.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613078aceb573---68360583778.pdfIn PDF document text
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/dulunakigudinibavure.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/eb64447834126fe8fbb380974afe437c/98238429302.pdfIn PDF document text
    • http://verzorgingsindex.nl/images/uploads/gagidudemomavu.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9d667b54e---54686852192.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b227204d1e---6473973772.pdfIn PDF document text
    • http://archi-m.ru/userfiles/file/melisabal.pdfIn PDF document text
    • http://bdpq.hungminhits.com/files/uploaded/files/jemal.pdfIn PDF document text
    • https://pindimana.in/uploads/file/nefeg.pdfIn PDF document text
    • http://spiregene.com/image/files/20210923_234908.pdfIn PDF document text
    • http://robedecreateur.com/img/files/futizupujukejulo.pdfIn PDF document text
    • http://radis-rrl.ru/userfiles/image/66971551530.pdfIn PDF document text
    • http://englandmatchshirts.com/assets/file/50178026575.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/e53335360be4fc7bb11cd169fb180070/xujidos.pdfIn PDF document text
    • http://aroma-es.site/yamituki-n/uploads/files/nojosenixufoguxizebijaj.pdfIn PDF document text
    • http://kortennis.co.kr/B/ck/ckfinder/userfiles/files/xudenilino.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/27760744170.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_off0000b34e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB34E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB65 10732 bytes
SHA-256: daafd168aa694819d1cd2b5bac6407c4c7dd44791a0a63def13e22d71d4d3a47
font_02_sfnt_off0000e436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE436 14688 bytes
SHA-256: c3ea8490b0593ca872462b8bb8e9ddd73486d577b3f871eae16f14ca35ad2b9a

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