Malicious PDF — malware analysis report

Static analysis result for SHA-256 0570a78f2d099d36…

MALICIOUS

PDF

83.6 KB Created: 2021-08-17 12:52:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 95cdea074a6301b43cab23172fd22386 SHA-1: 34e952f4450d051c55869db28443c5cc6e323896 SHA-256: 0570a78f2d099d36b69421f61fcdbcb53fa79baf62d7535b6971f6992e81825f
156 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. It functions as a link farm, directing users to multiple compromised WordPress sites, likely to host further malicious content or facilitate phishing attempts. The presence of numerous external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5730b3d34---zesusigozubimizoronix.pdf In PDF document text
    • http://charivne.info/images/file/guxepugusisizugitetetoj.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071ee65c3645---90343864521.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/d07e6db18020d96eac672b7880cd4f1c/xekurutas.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/21880511308.pdfIn PDF document text
    • https://jackyrouxmethode.com/userfiles/file/66693399503.pdfIn PDF document text
    • http://tano-cable.com/d/files/rilizisesiso.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/lulumezixokewujomed.pdfIn PDF document text
    • http://theartofdesign.nl/ckfinder/userfiles/files/wepejavititevopobebeb.pdfIn PDF document text
    • http://aranysolyomfeszke.hu/editor_up/53124383447.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/nideparewasu.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/rf7uruvg23llb85k7355goafgq/85510818791.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/63575107469.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a9c18826dcd---28631394981.pdfIn PDF document text
    • https://hotelmitrutarija.com/uploaded/files/zusakifotunusogigokekefu.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/25346100676.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608599c71dce7---99067039668.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/wejewagememozesot.pdfIn PDF document text
    • http://csc0535.com/userfiles/file/20210716121727_hjzfc7.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/6e8fb55d79dee0b9c9e7dc7f9ca24733/bufujizepibevaxenokupiw.pdfIn PDF document text
    • http://citywideok.com/clients/75789/File/tifatiduxutaxolifum.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160895320076b4---rofalapajifadi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=dimensiones+de+una+cancha+de+baloncesto+fibaPDF 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_off0000e26e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE26E 17388 bytes
SHA-256: e2932c316fd8b25f10aaa0e6ceb0b7ec03b18da2c2be09f142e81e9cf3155db2
font_01_sfnt_off00010ea6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA6 10884 bytes
SHA-256: 1cce742ba2cc6a558729ccf7387c8ce58ca0048c3df07a47f767d46ed6e1531a
font_02_sfnt_off00012798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12798 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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