Malicious PDF — malware analysis report

Static analysis result for SHA-256 54907f3edb43a73d…

MALICIOUS

PDF

84.7 KB Created: 2021-09-15 20:29:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e0229bf00ba371a1327988e55a2df194 SHA-1: 3eff9c58008ea46f697a22fc3d33641fab7ef353 SHA-256: 54907f3edb43a73d42c26d128829d27e77f6c4a80834e003ac09344f6df25740
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links pointing to various domains, many of which appear to be compromised or disposable hosting. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to open a password-protected archive, a common tactic to evade static analysis. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://oniceh.ru/uplcv?utm_term=como+ocultar+aplicativo+no+android PDF link annotation
    • http://chi-kara.net/userfiles/file/wugukalebulezo.pdfIn PDF document text
    • http://wenfengsi.com/wfs/WebFiles/file///2021091522124310.pdfIn PDF document text
    • http://kaizenlife.com/ckfinder/userfiles/files/fobemogomip.pdfIn PDF document text
    • http://fornacedelia.it/userfiles/files/lipujumoxobifibup.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f49839669e---1848437481.pdfIn PDF document text
    • http://arabstina.com/ckfinder/userfiles/files/26178085603.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/buzolumagetalojepavibor.pdfIn PDF document text
    • https://erdenet.mn/userfiles/file/30020492921.pdfIn PDF document text
    • https://gtnet-engine.com/ckfinder/userfiles/files/76723528964.pdfIn PDF document text
    • https://berbagiangka.com/contents/files/jisesejagugixarufe.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/1d63e92f4ca3f74f1097b31360a261a3/24993141645.pdfIn PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/94000846163.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1613d83798e693---nebopin.pdfIn PDF document text
    • https://idea-web.ro/app/webroot/files/userfiles/files/22312627989.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/kumemenov.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/82512275784.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/duzininigudez.pdfIn PDF document text
    • http://cedule-plachty.cz/files/file/65931821296.pdfIn PDF document text
    • http://15881588.com/ckupload/files/87927276097.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/8f4b1b7f7c5f9c25c90c1bf987a2c4b6/2305367446.pdfIn PDF document text
    • https://drosamahetta.com/userfiles/file/vefilivopo.pdfIn PDF document text
    • http://i-harmonics.com/upload/files/73784624428.pdfIn PDF document text
    • http://luijkzonwering.nl/image/file/64951529381.pdfIn PDF document text
    • http://mamam.by/upload/File/file/zeliburavinamemepitetuko.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161413f11c2e67---78375720451.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_off0000e5ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5AC 18664 bytes
SHA-256: b9c6ff7b0a25b91e6789d166ab91ddd1faa7fb4d7359824148cb4e067127e481
font_01_sfnt_off000114d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012cea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CEA 10572 bytes
SHA-256: 8f2df13e427526c8f9d7b10610ac2bca9422f39796a35f0e3e8ff1947f6f227f

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