Malicious PDF — malware analysis report

Static analysis result for SHA-256 65b276e8584c779f…

MALICIOUS

PDF

77.4 KB Created: 2021-09-07 07:01:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 77fdae949c9748265c90e8653777fe39 SHA-1: 84630142287fc8e8b3ceb2601ea8e9e8ab8c2bde SHA-256: 65b276e8584c779f9bd0a5366c009bb44bd63255a56e8d49d406e5aa2ea1793d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://laborke.ru/uplcv?utm_term=volume+of+spheres+cones+and+pyramids+worksheet PDF link annotation
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9bcb06b19---39406464001.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/mmfu5dljd322ms7l9aei5prv0i/686722989.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f2ed4a9f4---13855517742.pdfIn PDF document text
    • http://kruengrangthai.com/files/files/82487643063.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/22018558470.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/02e07e19b31068d418f9fc07b9b18237/23587890733.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/43475719889.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160acd68729b34---93334505215.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/93612531376.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/160913a1702b81---5404660759.pdfIn PDF document text
    • http://sanders-scottfamily.com/clients/26926/File/28960576252.pdfIn PDF document text
    • http://floral-design-lindgens.de/userfiles/file/jemuz.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/13aaa6c25c06e43cada1bfbdca972278/vuwodakareradilufakofoj.pdfIn PDF document text
    • http://100gastro.cz/soubory/files/16367367400.pdfIn PDF document text
    • https://samarpanbharat.org/trila/userfiles/file/30774657006.pdfIn PDF document text
    • http://tehnicgaz.eu/files/file/pujig.pdfIn PDF document text
    • https://eprobatdz.com/ckfinder/userfiles/files/jizikos.pdfIn PDF document text
    • http://xindeshiye.com/uploadfile/file///2021080604295127.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/16119b2dbd9149---vilepebabakokavonisu.pdfIn PDF document text
    • http://dmhu.eu/uploads/uplib/file/30829812576.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/jelisizikukot.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609f80944589b---wovuzadolilatuve.pdfIn PDF document text
    • http://polesprogettazioni.com/userfiles/files/61034126988.pdfIn PDF document text
    • http://tsyrulnikov.ru/upload/file/voxemuziwizepo.pdfIn PDF document text
    • 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_off0000c8ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8CE 11248 bytes
SHA-256: 3f8b285b7d4f748253149e53d42ed3066897ebc6f9fd0bcb0d62e074e5878c84
font_01_sfnt_off0000e31b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE31B 17068 bytes
SHA-256: fc404a4ed2b15dbd18df6ae69cf0fb38d5100ccd35a4917010c084abfc86d7b0
font_02_sfnt_off00010f5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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