Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4974cfe459e984f…

MALICIOUS

PDF

78.6 KB Created: 2021-09-03 21:22:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 47b31b87fff58c40a1a5aed28508741f SHA-1: ca784c8326b707a02587920773a24e5e8fc53ff7 SHA-256: f4974cfe459e984f61cfff74ac8d12d826eb11c000739a0380ae43c24b025254
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a phishing or malware distribution campaign. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' further supports this, indicating the document is designed to redirect users to potentially harmful content. No scripts were extracted, but the overall structure points to a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://taiyoaquris.cn/upload/userfiles/files/20210814044556.pdf In PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160750abe87395---bekikunukevowifex.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/162866416698906390389.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/b8c0ac638d4091a02fc4b3bb1cf7f94d/xixironixu.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pisaj.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/9guor1m0f47r51891ddcsf1v9v/36893400446.pdfIn PDF document text
    • https://eagle-aviation.com/userfiles/files/51291795654.pdfIn PDF document text
    • http://ellev.fr/upload/files/baveravu.pdfIn PDF document text
    • https://akemi.ro/hirek/file/gorexoliwusopoga.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/7ppt6m1vcelqv8ck6ri5qjcdc0/12158155343.pdfIn PDF document text
    • http://capitalclassof1971.com/clients/4/4c/4c1e4f015ba9b8bec237dc1ca705466d/File/33857641029.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/e412474e8f797efa0f1732b71b2371f3/30184517475.pdfIn PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/84495308496.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609adfee717c7---79991610716.pdfIn PDF document text
    • https://nacionalequipamentos.com/ckeditor/uploads/files/mapof.pdfIn PDF document text
    • https://paymentor.nl/uploads//file/26454115250.pdfIn PDF document text
    • https://network-italia.it/file/8079622477.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16075e31d6427c---kifagetepexosolok.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/53473649877.pdfIn PDF document text
    • http://rencontres-icare.org/userfiles/file/53998955127.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/zalulajerisil.pdfIn PDF document text
    • http://www.heksan.com.pl/file/berisezoxiruzozowi.pdfIn PDF document text
    • http://ags-sib.ru/ckfinder/userfiles/files/jivumevufobonuvesuwiwudif.pdfIn PDF document text
    • https://bilegt.mn/userfiles/files/89134813852.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=nc+studio+manual+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_off0000cf0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF0F 10628 bytes
SHA-256: f81c8595d7eb1aa775407a0425d1da5d2cb946036e33aa75b990ebb19982207f
font_01_sfnt_off0000e75d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE75D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF6F 17396 bytes
SHA-256: 3d27870b46fb77d309619ab3ccc76db21c29ed73b0ceba159c2fc25062e0d321

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