Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee810323defd00bf…

MALICIOUS

PDF

85.0 KB Created: 2021-09-27 02:47:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f86628e3b181226dce0887e8707a97a0 SHA-1: a4295cd639ee9153b84c84bae610ecdf74fa8963 SHA-256: ee810323defd00bf1bc8c29904e2b1613d729a38a38761e1b7cd377d3e991d59
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS uploads or disposable hosting, indicative of a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the PDF structure itself facilitates the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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 http://xinxinhouseware.com/uploadfile/files/8765500963.pdf In PDF document text
    • http://dedanskecasinoer.dk/userfiles/file/90557455061.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614144058c2c7---rigumuzobilamit.pdfIn PDF document text
    • http://pescepiana.eu/userfiles/files/rupoxogagumal.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021090902162273499.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/zijezew.pdfIn PDF document text
    • http://aroma-es.site/yamituki-n/uploads/files/nukodadesanijalonomi.pdfIn PDF document text
    • http://gianenricofabro.com/userfiles/files/fekukivovidewanixag.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/161490f1d78540---vejofirozisuvif.pdfIn PDF document text
    • http://southerncross-ex.com/images/blog/file/73973879331.pdfIn PDF document text
    • http://parkergeneralcontractors.net/userfiles/file/97486342560.pdfIn PDF document text
    • http://meghdoothsuzuki.com/uploads/74704759930.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e824d76341---86695782979.pdfIn PDF document text
    • https://cleanenergy.mn/uploads/files/48318587843.pdfIn PDF document text
    • http://autokolcsonzoszolnok.hu/admin/fck_upload/file/moxutedudisutabexasonewu.pdfIn PDF document text
    • http://montesantangelo.it/files/files/87556240496.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/55091843588.pdfIn PDF document text
    • http://yacpa.org/yacpafiles/file/xilubadadisujefuxaxatarit.pdfIn PDF document text
    • http://blccy.com/userfiles/files/34130966486.pdfIn PDF document text
    • http://shethof.ch/cgi-bin/dynamisch/file/veroterolapirunegotesejun.pdfIn PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/zolixiwuzokirerujorasej.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/43564277627.pdfIn PDF document text
    • http://lucchetta.net/userfiles/files/belusej.pdfIn PDF document text
    • https://candbco.com/ckfinder/userfiles/files/biwurezuzaperatozotorogef.pdfIn PDF document text
    • https://mygoaltv.org/ipp/images/uploads/files/rokixeba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=naruto+vol+2+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c5c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dddb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDDB 21404 bytes
SHA-256: 637abf804216d8274623e7dda5057f621dfc5d436b0dd3e9a91497616b26a395
font_02_sfnt_off000115d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D1 10260 bytes
SHA-256: 4b75c5a3d4ce1fd074ddbaf51a81a9744fa93ab6ee25f1469bc46145fce7364d
font_03_sfnt_off00012d18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D18 17192 bytes
SHA-256: 736bad5b1f990d62aed4ecf6620ce51020afb900679dca4ee8c145c7c85029fb

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