Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b497775c7d406dc…

MALICIOUS

PDF

83.2 KB Created: 2021-09-03 20:59:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 10a0494d38759ad193148b06e6cb77eb SHA-1: 33bfdf5fd55aed9d2df4efa8fa947146af9b3389 SHA-256: 0b497775c7d406dc4c11264964e181464c3e9b9aef8f9ee8f5f440dc1faf4953
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to numerous domains, many of which appear to be disposable or compromised, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or delivering a secondary payload. The document body is heavily obfuscated and does not provide clear textual lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://copelandreunionla.com/clients/6/66/66f6f3de7053633686652f51c4c00696/File/kuzamev.pdf In PDF document text
    • https://hondamienbac.vn/userfiles/file/rifilekepajobuvuzix.pdfIn PDF document text
    • https://sealordhotels.com/ckfinder/userfiles/files/34857241666.pdfIn PDF document text
    • http://automotiveenergy.cz/userfiles/file/61238242477.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b38f95a049---mixerovexojekuzekem.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/werepodizur.pdfIn PDF document text
    • http://bscartridge.com/pic/tajijeluvuv.pdfIn PDF document text
    • http://divorcefinance.nl/uploads/file/14076998395.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/7de6858040fb8b17dcbf33ddd98c8d36/bedekutegu.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e54a614cef5---vujuvisibuzakavuxozewuw.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/bemafexavusuvenetofi.pdfIn PDF document text
    • https://charteriraq.ir/basefile/charteriraqir/files/65093210701.pdfIn PDF document text
    • http://trendymamy.pl/userfiles/file/sudidogonedemanul.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f98d61a7ee3---tedejojovofozapofuzeje.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e168713ea35---gerezurekibixufimokusow.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents//files/tewutoj.pdfIn PDF document text
    • http://anandtouristcorporation.com/uploads/lonaduduropemulutafiz.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160d5a20f5a5c9---bukoja.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/40914083422.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/b64f35d645a8285363d9c10b71b7fdee/wofigoxexemezalebegom.pdfIn PDF document text
    • http://jmestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/begekovoxoxo.pdfIn PDF document text
    • http://phuvuongcorp.com/luutru/files/mexunupa.pdfIn PDF document text
    • https://biocoop.legreniervert.fr/ckfinder/userfiles/files/79750525492.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=relatorio+de+auditoria+condominio+pdfPDF 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_off0000dcc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC2 10756 bytes
SHA-256: d35b61850202ba4d845c94f118a42df922b30c104cee2b7a6e2d7739aec5eef9
font_01_sfnt_off0000f565.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF565 19484 bytes
SHA-256: 1091732e964698bb3cd5ad41f7b6175c1851331555980eb46012b6912d013d54
font_02_sfnt_off0001276d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1276D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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