Malicious PDF — malware analysis report

Static analysis result for SHA-256 5724428a20f45350…

MALICIOUS

PDF

77.1 KB Created: 2021-09-13 13:03:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ecf0744b8e25868152ddf4fd716f736f SHA-1: c1c10c6f8dbd960de3aa2da93a6c9f70b14b5766 SHA-256: 5724428a20f45350a3be395f447e02d389afee5c6118086804fa62b11e2292ea
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to various domains, many of which are associated with compromised CMS uploads or are part of a link farm strategy. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, suggesting an attempt to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://pixomot.ru/uplcv?utm_term=heart+failure+pdf
    • http://glassick.com/userfiles/file/tejifiviruwaxile.pdf
    • http://sipsak.nl/userfiles/file/99216166661.pdf
    • http://tdsns.ru/userfiles/file/wajoxuze.pdf
    • http://jfe.hk/userfiles/94184027317.pdf
    • https://rotitelor.com/contents/files/denobototiliwi.pdf
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/xexekorexogabivuvejiravif.pdf
    • http://moscowballet.ru/userfiles/file/bejajepizomupub.pdf
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1612eab399a991---97572414855.pdf
    • https://efficimm.fr/userfiles/files/bewebaluvuwidu.pdf
    • http://elementsgogreen.com/userfiles/file/22497598736.pdf
    • https://lawina-radom.pl/files/file/94994013365.pdf
    • https://paron-rebondir.com/uploads/files/65835082587.pdf
    • http://tnmetalworks.com/images/files/52675193148.pdf
    • https://aeternoplanning.com/ckfinder/userfiles/files/44097637482.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/65649885547.pdf
    • https://postelezmasivu-zlin.cz/ckfinder/userfiles/files/rogexitules.pdf
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf3e7e6158---89608559707.pdf
    • http://dirpub.org/editor/ckfinder/userfiles/files/rovaso.pdf
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161340e14a2917---jesunufatuwagofiful.pdf
    • http://pijntherapie.be/uploads/files/gogozut.pdf
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16136ca5692ce5---17850528912.pdf
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613040d71beb4---18784445387.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc0a.bin
2c261982909185de5d72a46d2e8dd46ac94f80111f89f549a7f3172a39896a3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC0A 17288 bytes
font_01_sfnt_off0000f805.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF805 16792 bytes
font_02_sfnt_off0001101c.bin
86079b9b8bfad2e7ba4ca7b47c7169b6dd780916d23556cc62129a406d521eae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1101C 10188 bytes

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