Malicious PDF — malware analysis report

Static analysis result for SHA-256 ead732df82fac1cc…

MALICIOUS

PDF

70.2 KB Created: 2021-09-05 23:27:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3438f553f106b25db6d655b321e7cac1 SHA-1: 98c58d58b4714d0e2786e37aa43afa4a9265376d SHA-256: ead732df82fac1cc4bd571d46eb056da5cf833b94d332880863e2d8b017179a2
156 Risk Score

Malware Insights

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

This PDF was flagged by ML and ClamAV as malicious, indicating it likely serves as a phishing lure or a distribution point for malware. The heuristics reveal it functions as a link farm, pointing to numerous compromised WordPress sites and disposable hosting domains. The embedded URLs suggest an attempt to redirect users to malicious content, potentially exploiting vulnerabilities or tricking them into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 http://zonazero.es/userfiles/file/zonewowosojajozawolujed.pdf In PDF document text
    • http://bet-balance.com/userfiles/file/mexuvijegibopuparipefigu.pdfIn PDF document text
    • https://sanxuattrucauthangkinh.com/Images_upload/files/wugavalovarow.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/cc5758757408c0544299d27f5d52bf5b/66766691185.pdfIn PDF document text
    • http://thecountryclub32055.com/userimages/60875598509.pdfIn PDF document text
    • http://yao-cheng.com/uploadfiles/20210819125230.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/wuximoratajefirar.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b20e9018bf8---raxulajire.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c85d1d43e79---91855068166.pdfIn PDF document text
    • http://christopherspubandgrille.com/userfiles/files/6411107049.pdfIn PDF document text
    • https://mattress-leader.com/media/77727578186.pdfIn PDF document text
    • http://iberryhomemade.com/userfiles/files/77675629533.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160dfb63c96a2f---zuxowaparosuxetop.pdfIn PDF document text
    • http://cosmickino.ru/sadm_files/47299291021.pdfIn PDF document text
    • https://fiberglasssupplydepot.com/userfiles/file/pevupurage.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/2094788575.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/76619957868.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/41573594551.pdfIn PDF document text
    • https://shunnasato.com/72301416812.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9c6bf098e8---48274575328.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9ee46d967---21344210756.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/1610709d2602a1---dizol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=basic+interview+questions+on+java+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_off0000b338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB338 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB4A 15208 bytes
SHA-256: c1eda23aebd473a3d445fddc325a65fb1dd0e8282a907c701c81656a7b1cdd2b
font_02_sfnt_off0000f16c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16C 11148 bytes
SHA-256: b74f07be89df124b25362dc6ff8e91abb28f04407ac009954d581f8f935b7028

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