Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d7b98736572b4c9…

MALICIOUS

PDF

74.3 KB Created: 2021-08-29 09:50:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e00aa27096c7f8468937b7f4383d0784 SHA-1: 2b571e530e67494af10c78501b7f6b26805adb7d SHA-256: 4d7b98736572b4c965fe8d981c14be17337609234e28dbf5976a7b0143bbe2b3
196 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it uses a 'Browser extension / update installation lure' to trick users into installing malicious software. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it is designed to lead the user to download and execute a payload, potentially via a compromised website.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://santeh.md/img/files/betuleku.pdf In PDF document text
    • https://etonbio.com/newsLetters/images/file/46418094168.pdfIn PDF document text
    • http://xatrbio.com/userfiles/file/sogupopefu.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/afda242c439abf78714ddfc530701a60/21978874288.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4a3b62aa9---rokimezokofixisalapovo.pdfIn PDF document text
    • http://takeacode.eu/user/d41d8cd98f00b204e9800998ecf8427e/file/66185742583.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607967b75709a---suzupugip.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb802bb04e9---92620031814.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/95199988693.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/63570560065.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609532171ed8f---7968383035.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/8a4aa90b964a477caf37dea1c9242859/fegikugilaxarodesukotej.pdfIn PDF document text
    • http://utopbrake.com/uploadfile/files/30789328539.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///loferimisufovomigel.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/34686048790.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a5974e78566---34594720377.pdfIn PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/45121145066.pdfIn PDF document text
    • http://exima.kr/userData/board/file/lilimakodejujobixu.pdfIn PDF document text
    • http://oaklandscreche.ie/userfiles/files/82613839291.pdfIn PDF document text
    • http://professionalcatererspaul.pageindia.com/resume/cms_files/files/53805292426.pdfIn PDF document text
    • https://imagebuzz.net/ckfinder/userfiles/files/14237375591.pdfIn PDF document text
    • http://backyardreleaf.ca/clients/6/6a/6a4eaaf8452764cb6fc14c9064ed0c71/File/45524935904.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a07241ae79e---poxigapudepade.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=how+to+change+an+image+from+pdf+to+jpgPDF 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_off0000c044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC044 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d856.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD856 16076 bytes
SHA-256: 44011fe6e3d9cdf12ea263ad2d5f0c2fc36e9fc297b3c377ed03574de634b615
font_02_sfnt_off00010136.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10136 11060 bytes
SHA-256: 10f5822e422b07b230cfd3818a055f30957d95eb5636a110f1fd4591deace9be

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