Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2f6fd3d3b678269…

MALICIOUS

PDF

80.5 KB Created: 2021-09-05 03:45:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: cf1a630e3d30eea72a0346d0be2786a3 SHA-1: 4c567831ca3b929ef1584bf9462fd5e08a3bfe06 SHA-256: b2f6fd3d3b6782695be37fbcd4583fb8898eb6e732952f7957772373a645ac83
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://fujiya-la.com/uploads/files/vatilati.pdf In PDF document text
    • http://mfahk.com/upload/files/mefojinodibidaziwoluvobu.pdfIn PDF document text
    • http://vinhthuan.vn/upload/files/tibekotuwojupuxokupanomum.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/bf5d35f531a3b2e62cdbe60652c10eb5/78443643372.pdfIn PDF document text
    • https://rewaqousha.net/userfiles/files/xiferupovazipogofip.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/27f396b4558d41c51d0814cfc006b5df/97143531437.pdfIn PDF document text
    • http://edallyshop.com/upload/files/42311971547.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160922c010353c---28469120896.pdfIn PDF document text
    • http://byecook.com/ckupload/files/78579767057.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/xefibaxulovozexig.pdfIn PDF document text
    • http://dogoducthien.com/uploads/files/polodesebofa.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/dc2vapulrg4gdnss6l5adqirj4/tumupi.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1c140ec2a8---jefobukujavazixefev.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/60861150929.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/59841613417.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/lewon.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/a8e58989102a91e65950af982a5b9d32/83956782258.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/pewidapika.pdfIn PDF document text
    • http://www.primariasantana.ro/uploads/file/wimimifemopenuj.pdfIn PDF document text
    • http://scouttautomotive.com/editor_uploads/system/files/97507746025.pdfIn PDF document text
    • http://backkwang.com/userData/board/file/ranufedinu.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/10d94bd73b5f2562212332e92cff0aae/duvagevazuzidimizawusujaf.pdfIn PDF document text
    • http://feach.ie/images/uploads/file/9328131854.pdfIn PDF document text
    • https://mavibusiness.it/file/guxamuj.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/89066484647.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=siebel+developer+handbook+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_off0000d849.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD849 10700 bytes
SHA-256: 5916fc41a0869995a793bd17a4fd03635304f2b36b32b3beb99f42444e4d2b01
font_01_sfnt_off0000f081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF081 16948 bytes
SHA-256: 6e5e275da8acc19101fe51651e6831210f4677313c115831794584ada4c1acbd
font_02_sfnt_off00011c49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1