Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb16541dba94b7ad…

MALICIOUS

PDF

92.3 KB Created: 2021-09-18 16:06:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: eb8eb57a94e94383dc535e67859edfae SHA-1: d13b95b70c77d1d9aacc6be565ea4f5bc503c5e5 SHA-256: fb16541dba94b7ad545e195aa86c4389e27730303dbd1f40e856773f7570df99
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple disposable domains and compromised CMS upload directories, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nage-z.com/ckfinder/userfiles/files/vapupipexotowuwumoli.pdf In PDF document text
    • https://banerjeetourspecial.in/ckfinder/userfiles/files/zejixijad.pdfIn PDF document text
    • http://modero.vn/upload/files/94022192480.pdfIn PDF document text
    • https://calson.garment-pro.com/ckfinder/userfiles/files/66808311355.pdfIn PDF document text
    • https://apexsafetyproducts.com/ckfinder/userfiles/files/1138829154.pdfIn PDF document text
    • http://lamekatus.com/uploads/ckeditor/files/77973111507.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/0c56ae28fe30da31f33c18c532981897/13320547324.pdfIn PDF document text
    • https://jagamimpi.info/contents/files/44579390479.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/34814372571.pdfIn PDF document text
    • https://dellrein.ru/content/file/javuke.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/2b791a1f130b4754fe5d7bba89ac643d/zitoladurobuxuzo.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/59000948958.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/dagadeze.pdfIn PDF document text
    • http://rileyillustration.com/images/agency/files/64267452147.pdfIn PDF document text
    • https://darshanam.com/ckfinder/userfiles/files/12881120926.pdfIn PDF document text
    • http://sushigonewildtogo.com/uploads/files/nabominofagug.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131bab19524f---dotibobeboxemaker.pdfIn PDF document text
    • https://puntodeplacer.com/userfiles/file/kefuvutalotarekobojimal.pdfIn PDF document text
    • http://sbstroy53.ru/img/files/61495233129.pdfIn PDF document text
    • http://debten.net/UserFiles/File/perijugizubebedinoni.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zoxukorew.pdfIn PDF document text
    • https://maria-galland.ru/files/file/2719553320.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=among+us+play+now+onlinePDF 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_off00010266.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10266 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011a78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A78 18828 bytes
SHA-256: bc20102adf05024d6f49a466c0f9619f3a72bd207b8d83e9da6b5bd2671ce18d
font_02_sfnt_off00014b31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B31 10680 bytes
SHA-256: ffdaedafe1c50b2a2694807db7192de0d446b38cc7467b22f77ba7b0a0260a1d