Malicious PDF — malware analysis report

Static analysis result for SHA-256 8152fc3d72e577ad…

MALICIOUS

PDF

80.8 KB Created: 2021-09-06 10:35:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9a54596368220861e23e01262fd0e94c SHA-1: f3bb89542c70ee7b05816b5098b6dac881aa2ec9 SHA-256: 8152fc3d72e577adbc1ff0ec18d93b8476abec0b3b887010ca1c7fd1334aca91
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to numerous PDF files hosted on compromised WordPress sites and other domains, suggesting an attempt to distribute malicious content or phish for information. The presence of external URIs and link farms indicates a likely spearphishing attachment vector, aiming to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • 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.
  • 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 https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/67bd66a4ed5c0368a15e857cb9d8c941/71573075314.pdf In PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160853f629c1f4---69309445671.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202105110656475934.pdfIn PDF document text
    • https://qian-ho.com/upfiles/editor/files/lodavorej.pdfIn PDF document text
    • http://sksound.com/userfiles/file/74619085887.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a547096c8---57034873235.pdfIn PDF document text
    • http://hrzservices.com/uploadfiles/file/vupiku.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b24d51b268c---sukokemolibevedawozag.pdfIn PDF document text
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/81742367736.pdfIn PDF document text
    • https://lifesmart.ro/ckfinder/userfiles/files/51463879520.pdfIn PDF document text
    • http://erulingua.hu/uploads/content_files/files/fadafigunexejujule.pdfIn PDF document text
    • https://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/lurukejifowubomigo.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/zodow.pdfIn PDF document text
    • http://gemmacapitalgroup.com/foto/file/37638960462.pdfIn PDF document text
    • http://www.kotolantopeni.cz/files/53831847909.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d2b63b7d9bd---fabun.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/1e3650968f910eb0a7ce6a72ae81827b/madilijovojavefatevupuna.pdfIn PDF document text
    • https://amblamy.ee/upload/file/61308157405.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad9b2b8428---55400251874.pdfIn PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/jarozijoziberewa.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071a722b77b7---woxorenuxo.pdfIn PDF document text
    • http://wonderpanel.com/app/webroot/img/file/tumamuzajukowine.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097076ae6c7d---88952430611.pdfIn PDF document text
    • https://ntc-container.com/upload/files/sajupumojofupogeza.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609a5d7a360d0---90276452826.pdfIn PDF document text
    • https://gabinetpro.pl/kosmetyczka/krakow/files/nonodomodezexa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=uk+map+pdf+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_off0000d99d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD99D 10484 bytes
SHA-256: 9bb4355418ef30a6fad4c3f584a173dc56d095dc56a38831986993089c94d407
font_01_sfnt_off0000f165.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF165 17368 bytes
SHA-256: a381b802198b342499b0e398f2edc11ac63b5c49b884f71347a1db2815649e14
font_02_sfnt_off00011dbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1