Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ebb3ac74121ce0c…

MALICIOUS

PDF

97.8 KB Created: 2021-06-09 05:33:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 2722c6eaae252cbbfaa2deaa1c2d39f9 SHA-1: 9cdf44b672bf3dfe6c0c67c5dd94a0c4565e4965 SHA-256: 2ebb3ac74121ce0c3e42f681595c9b26c97fbcc67ca9e32db512b92fbf6bc453
164 Risk Score

Malware Insights

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

This PDF document is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to various compromised WordPress sites and disposable hosting domains, likely to facilitate the download of a second-stage payload. The document's content is presented as a physics book to deceive the user into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://coretry.ru/uplcv?utm_term=bsc+physics+mechanics+book+pdf PDF link annotation
    • https://performanceltg.com/wp-content/plugins/super-forms/uploads/php/files/47f96ceb87271dcbd960cd95020c4741/vaxavimoxot.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bff4555c049---lifivefuzugafijefixekiwu.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/p0sefidj8r88lu0saek8ev538n/puxoxosuduzibed.pdfIn PDF document text
    • https://mfdesign.hu/files/file/fupavupes.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/44504965760.pdfIn PDF document text
    • http://aite-materials.com/upfiles/file/fukupumotufitorexutu.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/a5063f7e48244f13267f86f224e03101/78298900710.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/543520b4e3c92b0e68bffd32734ef5e6/robetifuxigowaruzizapas.pdfIn PDF document text
    • https://marosme.ro/hirek/file/pozuxopiwilegerulajutako.pdfIn PDF document text
    • http://www.makattakasinti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083546914189---3060333892.pdfIn PDF document text
    • http://erdivigado.hu/userkepek/file/64611974376.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d5a0c411a99aa91c68ba23fb29781acd/sexapenamej.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/3487514740.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/tekofobukoguzokovo.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00012b28.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x12B28 22584 bytes
SHA-256: 39610673e337d56f4e2482528d54e1c754d7df9f3602d04baa0a6edca3d8dd5a
stream_006_off00015140.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x15140 12672 bytes
SHA-256: 9166fd604c5d8c649223c1d604feb46bd22754ee1b5f9c14bbab68bddad6c6c0
font_00_sfnt_off0000f25f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25F 5620 bytes
SHA-256: 7e79394eb48f35e0c346d7bc55508252602dde8ecd9592bcaa356ba814f17be0
font_01_sfnt_off00010563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10563 11016 bytes
SHA-256: 075b6f5e15155f9ba67060c878fd676b5e2e203022ea2f2fafd3fbf666b6c6aa

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