Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c4adf01add0292b…

MALICIOUS

PDF

63.1 KB Created: 2021-06-20 07:57:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bfdbb3a132675f88dc5718a18d135e55 SHA-1: 46fa1ed9b01ef7008707eec9772a911970e32f47 SHA-256: 7c4adf01add0292b81190e0238c0189fc1cdfadf3575dbddc6ae8aee3bc8b4e3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://dabaizhongxue.com/upload_fck/file/2021-6-18/20210618101825246208.pdf
    • http://matstravel.ru/userfiles/file/99792882802.pdf
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ffa45646e8---samorovunoxofep.pdf
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/e2h11610p5msfk4a81ihj3811e/42200770560.pdf
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac20840773f---kugotutadirekij.pdf
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be4e83976f3---rowarazo.pdf
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160ab55849fd5c---filemazotazu.pdf
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/53548a1260a4d884b11123e1829b2730/muverok.pdf
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a5db5aadb81---52799074541.pdf
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/nvmk8e55f98lkj2pf91qi2152d/vemiwitixituripusavajob.pdf
    • http://exmar.it/foto_fck/file/81523794284.pdf
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/n9lu76g7tbr0hb6d07s86lktjl/41951301125.pdf
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cde33e5aa34---refizugifutinopisiwul.pdf
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b29d5536ae5---79852446920.pdf
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a71e648c8ca---96554664357.pdf
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/160738428ab3f7---fusuwisunoxabotaja.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=transformers+2+izle+t%25C3%25BCrk%25C3%25A7e+dublaj+izle
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b695.bin
5e19f2aa5871dfa536d7e769bd04e1ddb2f557f8f7ec96e0fa8cbbf5ffa5a9c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB695 5768 bytes
font_01_sfnt_off0000c9eb.bin
893f1b43dce7e54115da43b350adeb8e21bdab97669249407d98afbbdbdf5172		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC9EB 11300 bytes

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