Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6b37f2dc3a883c2…

MALICIOUS

PDF

111.9 KB Created: 2021-07-15 23:45:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8f7714908f9f119d867cf808d39422e6 SHA-1: 901855c16fe314565ce59e320d6e91bf6ad49bd1 SHA-256: f6b37f2dc3a883c2f1c8702ba2219148d9d235386cfa6f15c30ec263b1f5459e
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1553.005 Security Software Tampering

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains multiple heuristics indicating it's a link farm hosted on compromised CMS uploads, likely designed to lure users. The document explicitly instructs the user to disable security software and install a browser update, a common social engineering tactic for credential theft or malware delivery. No scripts were extracted, but the overall pattern suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9666

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://cructi.ru/uplcv?utm_term=how+to+hack+pubg+kr+version+without+ban
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/d6c1a7bf1cadff1b83f7aa34925e32af/wuzodoro.pdf
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/11fe876a70040f87005933c06a8046a3/97367049872.pdf
    • http://akcjonariusz.com/UserFiles/file/dipuxiperil.pdf
    • http://locnuocvietmy.com/Images_upload/files/95958559077.pdf
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/94kepk8qhdppjtse6t6f79dgl1/96796343462.pdf
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078e1b71b523---37133240345.pdf
    • http://ascensionchina.com/userfiles/file/somidamafif.pdf
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16082ffb32d3bc---fevejikalagiduxog.pdf
    • http://www.toeterloeh44.de/files/sadiwo.pdf
    • http://dichvugiayphep.biz/upload/ck/files/fixapafevavoteraxer.pdf
    • http://fitviewer.de/files/file/fopepowiwido.pdf
    • https://imotrading.com/images/userfiles/mizotisufow.pdf
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/e987mj83jr0cougap7mrfvpvmc/dafutedajidepibu.pdf
    • http://sinproval.it/userfiles/files/62287347292.pdf
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d635ae697---9583998612.pdf
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/ba54f02f8472647df6cd2abc19f385ae/16119303208.pdf
    • https://sy-tech.eu/file/88854111548.pdf
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160903ef96f57e---22221516402.pdf
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160abc409ac891---33056810677.pdf
    • http://hoshitorionline.com/uploads/files/jazerupexexuluzu.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16087a19962f74---34721539539.pdf
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/43d67d3ae318f18c08bbcce4501ff201/febujareji.pdf
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078b98d7fc17---41669872549.pdf
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/8c3d93e3b94e91ff40d77f9611b22477/siwikoj.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160da2ec29b809---lowipefu.pdf
    • http://aiaato.com/FileData/ckfinder/files/20210627_CBC6D0DEC4682D47.pdf
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00017761.bin
1d022a7264946deaf58fa54a55a8340e978855edbb60da7bd44908ecc58bb169		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x17761 18668 bytes
font_00_sfnt_off00012bd3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12BD3 16792 bytes
font_01_sfnt_off000143e5.bin
bd5f8bcb2c6ad0dd6cebc193b49914d23000817b9672550ded5e2eefb5999426		 pdf-font-stream PDF embedded font (sfnt) at offset 0x143E5 19344 bytes
font_03_sfnt_off0001963c.bin
2759e895c1705ca8525e6d4b441687eb4e4bfea95fad48b2a798b1a1397a5c90		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1963C 11084 bytes

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