Malicious PDF — malware analysis report

Static analysis result for SHA-256 73729a642f46e9c0…

MALICIOUS

PDF

81.1 KB Created: 2021-09-17 21:26:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e544eb673e88f21098167d33bcf08055 SHA-1: ca7382499188bbf7d0baecafd24ef0409901bd87 SHA-256: 73729a642f46e9c0b80c915c69c55b2fea664a8f38df35a6dde921eff1b921f6
196 Risk Score

Malware Insights

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

This PDF document is classified as malicious and likely a phishing or trojan delivery mechanism. The 'SE_REMOTE_SUPPORT_LURE' heuristic indicates the document instructs the user to install or connect with a remote-support tool, a common tactic for social engineering. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it may exploit vulnerabilities or redirect to malicious content, potentially leading to the download of a second-stage payload. The presence of multiple links to potentially compromised CMS upload storage and disposable hosting further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://maremania.net/img_pagine/file/bewabosimeduvax.pdf In PDF document text
    • https://glamweddingdesign.com/userfiles/file/36551846191.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9dd68f724---27705879109.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/d10jtht0pfcpk4h231p1crj7a3/napukefekeseruregipuv.pdfIn PDF document text
    • http://holland-ex.com/images/blog/file/kiluxirepavekekevanutet.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/48825375531.pdfIn PDF document text
    • http://www.taimaobi.com/admin/ckfinder/userfiles/files/vutawajawewizavuzi.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/medulituvuguxojivipedapij.pdfIn PDF document text
    • http://abnig.friendship-match.com/upload/files/27024446843.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/57153904637.pdfIn PDF document text
    • https://romalasergroup.com/userfiles/files/58756433852.pdfIn PDF document text
    • http://cautrucpalang.vn/webroot/img/files/rusosidopekalulune.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5a7d9a970---61891741686.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/rakudaz.pdfIn PDF document text
    • http://aotwresort.info/ckfinder/userfiles/files/wobekufo.pdfIn PDF document text
    • https://soi.icami.mx/ckfinder/userfiles/files/luxifitolawo.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1613c76c84a348---61227587496.pdfIn PDF document text
    • http://humansharehouse.com/userData/board/file/wedifakujiravorakej.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/95805788197.pdfIn PDF document text
    • https://korankertas.com/contents/files/sawegotuvitodeza.pdfIn PDF document text
    • http://zkmeiqi.com/admin/ckfinder/upfile/files/zujozodofibo.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/29bdd57db4b398aba0e7b45160ad0017/22924490862.pdfIn PDF document text
    • https://ans5680.preneed91.com/upload/files/9380305754.pdfIn PDF document text
    • https://novitas.ro/files/vizakeda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=android+mobile+connect+to+pcPDF 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_off0000dbdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBDB 10464 bytes
SHA-256: a3df7345f8fabe78c69edc301201a5328d7609afa85c7c8c916e632e05a0c67b
font_01_sfnt_off0000f34d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B5F 17012 bytes
SHA-256: 3ccefb13962b8b1109a6d6bbc08645eb2a520139929b77285d3508f3c0c4d453

Open this report in the interactive analyzer, or submit your own file for analysis.