Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebc4d6fc0dc24e8d…

MALICIOUS

PDF

83.8 KB Created: 2021-09-02 18:46:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b290a403415b55896d0ab784cb6cb57d SHA-1: da8526834d0ce208b14490cdc8c8aa2d05141fd2 SHA-256: ebc4d6fc0dc24e8d2afb1f47d11a28778f42486b6e51471b6f8fff388c1b7953
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to other PDFs hosted on compromised websites, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a multi-stage attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/1539900c9c65680422e9bc49d3d3ae19/29470198726.pdf In PDF document text
    • https://vnnc.vn/img-hdmedia/files/vinonatobitilanikotibari.pdfIn PDF document text
    • http://cortabellanews.com/userimages/padofukuwemivivamukof.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/nojokubisafotizuzawobope.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16100c41548e64---sajefubirususuxuruza.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/viduxugodutosixij.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/16095afd7df77a---36407503122.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160762926cc8bd---32590133887.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/766f27588bfe0bddc9c0269c4fa432b5/gomavezexodup.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/paskc4sitfd4bcc4888qlespkr/totebusi.pdfIn PDF document text
    • https://thietbivesinhsonhoa.com/webroot/img/files/32121454147.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/jamogewepipo.pdfIn PDF document text
    • http://amdind.com/userfiles/file/vibuf.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d6cb27d1b---bijasube.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d69441ad55d---68770870858.pdfIn PDF document text
    • https://festacontinua.it/public/file/45580575381.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/h3cqnro3qkpkhm2kecq6m24i0h/gufolubo.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/2fe737ed9360539406dbdc61ed535dda/7603377825.pdfIn PDF document text
    • https://acornschoolcharleston.org/wp-content/plugins/super-forms/uploads/php/files/69e3b5a7ff1aa6ae16bcea531f371625/11298051915.pdfIn PDF document text
    • https://dla-pracownika.pl/pliki_user/File/rewisijumozad.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/ffba863c5314e8087740c49dfa25d0f3/8730413398.pdfIn PDF document text
    • http://vilocom.net/webroot/img/files/93486635016.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=face+expression+drawing+pdfPDF 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_off0000e1ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1AE 10816 bytes
SHA-256: 6f7ddc22ea281caa155d26181d559c9fb06ce1404e7b2fc3908a0f92e6522e46
font_01_sfnt_off0000fa9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9B 18160 bytes
SHA-256: 66b8f1f825751c8ed2fb8b09773ea1c27df57ac5e98a6c9fb4d2ee490a6b4ac3
font_02_sfnt_off00012972.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12972 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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