Malicious PDF — malware analysis report

Static analysis result for SHA-256 530950921b7e2dbb…

MALICIOUS

PDF

70.6 KB Created: 2021-09-19 04:56:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 5f14f82d628b439035568fc87b5c6a36 SHA-1: 8ef2eaf308830a9282e4189d37d47905cef2dd42 SHA-256: 530950921b7e2dbb012b51f9e529eaf858ea6cf3f46dd8a9b49e317ff35354fa
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains a link farm pointing to multiple domains, several of which are associated with compromised CMS uploads or disposable hosting. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure suggests it is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://mabuksusu2.com/contents/files/24000662268.pdf In PDF document text
    • https://ozora.schaffsen.com/contents/file/fidiferuwikutolemo.pdfIn PDF document text
    • http://wwm-quanta.com/upload/files/67812661476.pdfIn PDF document text
    • http://theprojectmanagement.guru/cote_dor_import/admin/ckfinder/userfiles/files/14151378770.pdfIn PDF document text
    • http://anbao.vn/uploads/userfiles/file/gijut.pdfIn PDF document text
    • http://elektrostroy.kz/ckfinder/userfiles/files/sanivisexumotixijifab.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/161309f49070dd---47037548410.pdfIn PDF document text
    • http://groupkaishan.com/d/files/79809412145.pdfIn PDF document text
    • http://savalis.ru/userfiles/file/28193729486.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/zagateropekig.pdfIn PDF document text
    • http://dezmaster.com/userfiles/file/96907039125.pdfIn PDF document text
    • http://netichikawaya.com/userfiles/file/bomemisulasipid.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/mitixuwasevax.pdfIn PDF document text
    • http://shendaoguoji.com/data/attachment/file/zaxezavi.pdfIn PDF document text
    • http://tischlerei-schlusche.de/sites/default/files/file/57979617327.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142f00128c3e---pewazulaguloj.pdfIn PDF document text
    • https://nicklason.se/ckfinder/userfiles/files/kepoxuwumi.pdfIn PDF document text
    • https://topupdana.com/contents/files/denamobiregezoduba.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16130205925c9d---35272287774.pdfIn PDF document text
    • http://restaurant-lyons.fr/userfiles/file/72480076992.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021090513114869.pdfIn PDF document text
    • http://fourfoods.com/images/files/gakesaxufubuxewavedaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=gears+of+war+3+co+opPDF link annotation
    • http://louisiana-arts.org.s150269.gridserver.com/siteuploads/editorimg/file/54982851400.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_off0000b43b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB43B 10428 bytes
SHA-256: a543b1ab3a574bac71cd8d070d6887074267f38440df76506c2d82b9707d0ddb
font_01_sfnt_off0000cc1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC1E 16040 bytes
SHA-256: 55ff4b172c1d8153db5db19f5400c345de51329a844ba2fbb6cf4a0ffab1dad7
font_02_sfnt_off0000f578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF578 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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