Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd72523996d55d79…

MALICIOUS

PDF

82.6 KB Created: 2021-09-01 23:17:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c01de6b07805cbbab7e0d8897ad1e902 SHA-1: efbd4741c66fde9e10b7a476852f6e8bdc7f008a SHA-256: bd72523996d55d797d095ddf62cf26fb0b677a4c6c0e828b9e7c464abecf9ec8
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload storage locations and other potentially malicious sites. The PDF structure and embedded URLs suggest it is used to distribute phishing content or second-stage malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

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 http://aimic.com/userfiles/file/10279016479.pdf In PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/7cafbaff6e7bb70dca5ba9fd7f4b5d02/mipotigabiwugazubev.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/pijisomewatetife.pdfIn PDF document text
    • https://www.ksmt.edu.np/assets/ckfinder/userfiles/files/tumatuvobenir.pdfIn PDF document text
    • http://a1climbing.com/userfiles/files/vezemezib.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/84ca275149cc787df61b997dd83c2cd5/duwumesipigadesi.pdfIn PDF document text
    • http://dallapietamarchisio.it/userfiles/files/wisitosedif.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/73pn24t2ufvgm3rkp6ifcc6d24/24583308058.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/sojivatijax.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/92e020c62c8bfb1da67475cf6fe7214f/43111164059.pdfIn PDF document text
    • http://www.sname.org.tw/sname/ckfinder/userfiles/files/34349236277.pdfIn PDF document text
    • http://radtel-sport.pl/userfiles/file/nabudikura.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612ebd7e7381c---dixif.pdfIn PDF document text
    • https://vestol.bg/files/file/81806326544.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/lufodawafifufilivor.pdfIn PDF document text
    • http://s2ipower.com/survey/userfiles/files/51362056806.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/rogirizetilamogalikigivub.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3bbb162a6---wukewupumeza.pdfIn PDF document text
    • https://mbbs.hr/files/tisiva.pdfIn PDF document text
    • http://instalater-macecek.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/seselewinanopirif.pdfIn PDF document text
    • http://campcolefamilyreunion.com/clients/82065/File/vorazisigogejokilemevaka.pdfIn PDF document text
    • http://fatfailogistics.com/fckeditor/files/file/gemame.pdfIn PDF document text
    • http://yuli-china.ru/d/files/86447963189.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/rlrh0jqtae9q77ji9p4f7ccbgg/wuvemujulonejari.pdfIn PDF document text
    • https://ventadeterrenosagricolas.com/userfiles/file/zikotosipififaxajuv.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a7bab364c19---nikowekaguroza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=is+a+seahorse+a+herbivorePDF 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_off0000e048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE048 10116 bytes
SHA-256: 189cab0a729f9429a8cfa405853f3380a54d265ba12b051bea0fea0d16e3c37b
font_01_sfnt_off0000f6fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010f10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F10 17216 bytes
SHA-256: 4f6ae3eede68fc097e73db0707a9def3e1d3216266feffa265073165ff27811a

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