Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f48d982d2de3711…

MALICIOUS

PDF

82.2 KB Created: 2021-09-01 00:38:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3e1614e58e9a0498d3366779c828d685 SHA-1: e21f25be675ae1b9bb78557d741effe0461cde8e SHA-256: 9f48d982d2de3711b7deb0fb9896bc41e174ad70c40db0b1149f341124eefce2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm with numerous URLs pointing to compromised CMS upload directories and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of embedded URLs and the nature of the heuristic firings indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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 https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/73717ddaf2f252212e80ab9f7773df23/31414999572.pdf In PDF document text
    • https://llibreriaha.com/img/events/file/9252756097.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160b354e1820d1---24514199582.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/32435446759.pdfIn PDF document text
    • https://vialivonica.eu/userfiles/files/fariw.pdfIn PDF document text
    • https://nodka.eu/ckeditor/ckfinder/userfiles/files/mubaso.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/xiwaguzasetejuwoxofa.pdfIn PDF document text
    • http://cicm2015.mist.ac.bd/app/webroot/ckfinder/userfiles/files/124825711.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/c94b0e5226bf14bfc4f6ae900e0dd9d3/mobajomedejed.pdfIn PDF document text
    • https://triptoboloyfoundation.org/editorsfiles/files/baveno.pdfIn PDF document text
    • http://sonsuadogo.org/Images_upload/files/69632313811.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/58867400394.pdfIn PDF document text
    • http://quiltingacademy.info/fckeditor/userfiles/file/jotugatupafizamexavurux.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/vigitonozujanurof.pdfIn PDF document text
    • http://vandervalk.reviews/app/webroot/files/userfiles/files/zitizogisewegasedepe.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/d711281dfead7194d951afe6a7261795/vekunewovosamibej.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16098967537748---77071840785.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/setuwunulaxuvojemoli.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/77b254c49b9c7147783ef39882e02db7/55615508047.pdfIn PDF document text
    • https://trsbarriersdirect.com/wp-content/plugins/super-forms/uploads/php/files/v3dt0ab4umi7icoubu3hoildng/91114298263.pdfIn PDF document text
    • http://frigotechreina.com/userfiles/files/wasanuzuforajukova.pdfIn PDF document text
    • http://abc-tel.ru/data/File/senopubebibukojenenojumo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=katie+mcgarry+pushing+the+limits+pdfPDF 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_off0000d87b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD87B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF092 11152 bytes
SHA-256: f7a69c047dc58896c185c7253cb235084a93fae0dabb166898f563b39d0e6028
font_02_sfnt_off00010a3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A3E 18176 bytes
SHA-256: bad3b279bc076b9e868c23cff265fd54e847bf3b19ce39c93c2a090d77481209

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