Malicious PDF — malware analysis report

Static analysis result for SHA-256 af0d567a36b6811b…

MALICIOUS

PDF

75.1 KB Created: 2021-09-27 13:47:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 34e8a5ffe98ff7da8e223313ba843cf7 SHA-1: 791cccfd989b311b810724f462c5bf4bc4c9d184 SHA-256: af0d567a36b6811b3085772f65e48f1c56515ffbaa652548299ccd8a0d490e8c
164 Risk Score

Malware Insights

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

The PDF contains JavaScript that triggers external URI redirects, as indicated by the 'PDF_JAVASCRIPT' and 'PDF_URI' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs point to various domains, some of which are identified as link farms on disposable hosting, further supporting a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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.
  • JavaScript action low PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://bluecars.pl/userfiles/file/mufijuven.pdf In PDF document text
    • http://huichem.com/ckfinder/userfiles/files/64225600136.pdfIn PDF document text
    • http://fundacjaproartis.pl/javascript/ckfinder/userfiles/files/zazepuxokinosivi.pdfIn PDF document text
    • http://valencia.thepokeluau.com/uploads/files/20538856227.pdfIn PDF document text
    • http://vititanon.com/user_img/files/mupuxokawofejeximak.pdfIn PDF document text
    • http://gddfboiler.com/uploads/files/lamaxomiwut.pdfIn PDF document text
    • http://fitviewer.de/files/file/99308989050.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613acedfa881e---luwisosudenunepobev.pdfIn PDF document text
    • http://gesht.ru/admin/ckfinder/userfiles/files/59113548774.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148897d80fc2---rugumeziwigulapuraduwaber.pdfIn PDF document text
    • http://vlajkylevne.cz/UserFiles/File/98408913285.pdfIn PDF document text
    • https://hometeamcorp.com/images/usr/69782291757.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/40852504422.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/bidufapufisej.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021092701035873499.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/wilixijilovorelutaxez.pdfIn PDF document text
    • https://aaaxxion.info/images/file/95030017958.pdfIn PDF document text
    • https://ceccarmehedinti.ro/userfiles/file/10366548320.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/konilasotosugigu.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/firexutefafabiferelir.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.com/filespath/files/20210911134740.pdfIn PDF document text
    • https://afritransport.com/app/webroot/files/file/vanuniziridowolemabo.pdfIn PDF document text
    • http://teleinwestor.com/userfiles/file/fuwejirerok.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/r43baps18ped7mjk3bq31uqce1/60245674255.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+print+same+page+twice+on+one+sheetPDF 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_off0000bdb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDB5 18600 bytes
SHA-256: 21e6b1013ade62c5e12a27a5a6c837e098805c7544c6136688e4d00e41bc8f4c
font_01_sfnt_off0000edc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC6 10852 bytes
SHA-256: e29f0330a870d66b44ae2ae07d6ffcae1028d90add74c09b5ae5cab5b03d2447
font_02_sfnt_off000106b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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