Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0f9d62358daecf9…

MALICIOUS

PDF

84.3 KB Created: 2021-09-15 08:58:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 066dc2098dc702ae6abce8dab8d2b32d SHA-1: 82a8435f8fd262117553116ba42b3bd6c65ae709 SHA-256: e0f9d62358daecf962ade74a5678b81eb456ad6402c9de44cdd3e8b9521af901
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to potentially malicious content. The presence of multiple PDF link farm heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ecosdaliberdade.com/ckfinder/userfiles/files/juvosumidogojebaliguxa.pdf In PDF document text
    • http://boonfagrandhome.com/user_img/files/bibezudasa.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/568577a980e75f13ff1f2419ed986200/26622702677.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/venalowijomoso.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16131723c74f3f---5108556280.pdfIn PDF document text
    • http://zhouzhuank.com/v15/Upload/file/20219111116556444.pdfIn PDF document text
    • http://whuntex.info/userfiles/file/zatoluzosazu.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/591fc2f5afa7fa468b6c88574936cb7a/10838043536.pdfIn PDF document text
    • https://grandiosieventinuziali.it/filesUploads/file/38771247254.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/99666287209.pdfIn PDF document text
    • https://4wheelchile.cl/admin/uploads/file/77105208621.pdfIn PDF document text
    • http://lyzjkgm.com/d/files/woxutatetobunadolidirowi.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1614138172d87c---zatewup.pdfIn PDF document text
    • https://artcorner-fiberglass.com/userfiles/files/wubixewisiwibupozodizajaw.pdfIn PDF document text
    • https://promise-land.com/upload/file/kipiwiretatig.pdfIn PDF document text
    • http://sakulchaiplace.com/Uploads/file/67409143288.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/gajerupofeteruvipewisura.pdfIn PDF document text
    • http://kavtas.com/images_upload/files/26744218670.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/974ndege8gdb7l66bbj0lnkpc3/56679439376.pdfIn PDF document text
    • http://evrokomplekt.ru/userfiles/file/dixamoxo.pdfIn PDF document text
    • https://marblo.ph/app/webroot/img/files/39305650486.pdfIn PDF document text
    • http://krr-nfe.com/suratnfe/UserFiles/File/bedesuvabunibopaxiwuduta.pdfIn PDF document text
    • http://rivucota.com/upload/files/niwibe.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161309cf525db0---fenutififaxilo.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/fdc88f17a528339993a9071c0c58316a/mezeporiwopitu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=deep+linking+android+samplePDF 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_off0000e3f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F3 17796 bytes
SHA-256: 1b401eae0be07d569171902eec2128accf6421fe92cbbbf43f7a8e073747678d
font_01_sfnt_off0001129d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1129D 10732 bytes
SHA-256: 1415abed7aa13c85779498d42f8c2c7a847ae734be8b22ae596620b51ebbb2d5
font_02_sfnt_off00012aff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1