Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b139e990d4834c7…

MALICIOUS

PDF

86.9 KB Created: 2021-07-31 14:41:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4603daaaf74b3d5c86d12ddb29b24fce SHA-1: 989a618200343f11ddea89c413d2d91fd311a95d SHA-256: 2b139e990d4834c70450f16982ce0b6705fe7963c10ec711da36ca00f5f9195f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as a link farm pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature. Although no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to lure users to malicious content, likely via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/2me5d7j7nah3h9tt1r865gsaat/28906579514.pdf In PDF document text
    • http://hoangduy.vn/vn/files/fevalaboxuposonoxedijosi.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a2415928432---54687847816.pdfIn PDF document text
    • http://floridadressyourhome.com/uploaded_files/userfiles/files/fedeg.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/48856458020.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609f211bf348a---50870909609.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160e91dc2e0a23---42860912921.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/72cfca9ed47fcef95ed47538b2cda717/tigesajafawuvanabefibemok.pdfIn PDF document text
    • http://byty-pardubice.eu/UserFiles/File/96295043495.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/8ce5888aae694606d2b51d44394a0b82/retuwisepirofozevavojen.pdfIn PDF document text
    • http://kepco-group.com/uploaded_files/userfiles/files/91182784540.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608f30aa0b1b3---40724849070.pdfIn PDF document text
    • http://assistance.uz/images/shared/file/66584122446.pdfIn PDF document text
    • https://dichvuketoanvn.org/uploads/files/34053526756.pdfIn PDF document text
    • http://a-mega.ua/images/uploads/file/31111847288.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/f07409e531d1f533c24ee33df325a205/8443397365.pdfIn PDF document text
    • https://viboot.com/ckfinder/userfiles/files/xapiru.pdfIn PDF document text
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/24283683636.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/059a59d2fa43c9ce31f9f89bc35c77d4/pemoguxaj.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/59528490694.pdfIn PDF document text
    • https://iskoruma.com/upload/ckfinder/files/39045137527.pdfIn PDF document text
    • http://dorp.pl/userfiles/files/fuxive.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bd28624b8af---fimedasovogixawotedodepe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=filmywap+2019+bollywood+movie+war+hindiPDF 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_off0000ef42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10759 11236 bytes
SHA-256: 6c699526793687ca0729abdeb99fb6b79b6c5b4898e20d7b5a4948a481e2f787
font_02_sfnt_off00012147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12147 16872 bytes
SHA-256: dd1b56237c09a7f8ac990efbfece93bb2c5a7ce2e3d4b77f9ca6e17d9cf15fea

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