Malicious PDF — malware analysis report

Static analysis result for SHA-256 d02d5227a617858b…

MALICIOUS

PDF

73.7 KB Created: 2021-09-19 12:46:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 07dd37c019f846f1c42141f6c216481c SHA-1: 02daa12230acadf982cb16ee096e123494e11d65 SHA-256: d02d5227a617858b9566a964a22759c06a8644221b0eabddb561c535c8bfe7f3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external links, some pointing to compromised CMS upload directories and disposable hosting, suggesting a phishing or malware distribution attempt. The presence of embedded JavaScript indicates an attempt to execute malicious code within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://rivucota.com/upload/files/90013569402.pdf In PDF document text
    • https://digicpictures.com/downloads/dobadubuteziworiz.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161413cd4ecfbe---17382918748.pdfIn PDF document text
    • http://ministerium.pt/files/2705217420.pdfIn PDF document text
    • http://kfgame.snailgame.ru/upload/files/20210901181826.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/nomikixudorubuvi.pdfIn PDF document text
    • https://marblobathware.com/app/webroot/img/files/wonaxadetafemamixoraw.pdfIn PDF document text
    • http://i-p-p-c.com/ckfinder/userfiles/files/vusifodixi.pdfIn PDF document text
    • https://www.leasing.net.in/ckfinder/userfiles/files/jozetabotomelifexupuxiwi.pdfIn PDF document text
    • https://www.uflo.edu.ar/ckfinder/archivos/documentos/28198846964.pdfIn PDF document text
    • https://sunrise-photon.com/upfiles/editor/files/31064761006.pdfIn PDF document text
    • http://linkipt.com/_UploadEditor/files/69428601054.pdfIn PDF document text
    • http://maxbrio.kr/files/files/xamojopunoxakisevu.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139549aee74f---gimud.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/elt7fmlagrmr3milolhm23im60/sadetaxuwo.pdfIn PDF document text
    • http://iviltra.lt/images/files/gisanov.pdfIn PDF document text
    • https://diedacorporation.net/freesiafiles/file/gojunigujaburugopetabu.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/6962715279.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/jamutumevipukuxasoxuk.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/34607639807.pdfIn PDF document text
    • https://nhatngudongkinh.phapluatvietnam.com/upload/ckupload/files/saruvenusuvuxubobilif.pdfIn PDF document text
    • http://ekorepetycje.eu/Upload/file/kawuzobewew.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/1895265223.pdfIn PDF document text
    • http://health-bridge.in/upload/file/bukafavaxidagekovefidides.pdfIn PDF document text
    • http://eatoceanic.iorderfoods.com/uploads/files/nijuvokonetonamoru.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a73606f723---87378839446.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=guitar+pro+app+free+downloadPDF 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_off0000bec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d6dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6DD 10548 bytes
SHA-256: 259ffa1f9bc8f41c76d3814b8cc34a291634902e94a20d2418e4387a91d1d70e
font_02_sfnt_off0000ef12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF12 16388 bytes
SHA-256: c9cfe4229d7d8e914b64abf74ac06d894f9a2cd7f098ea032cb51d1692647f44