Malicious PDF — malware analysis report

Static analysis result for SHA-256 53d4a279100eefdc…

MALICIOUS

PDF

101.9 KB Created: 2021-09-02 14:03:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 455fba4e2c76a290962cc5d0fe80e3c0 SHA-1: 2a9164a6d89312a5fcfa2c910a866b2c75cddb35 SHA-256: 53d4a279100eefdc5e7a0676cb442acef14933bf5e5ad0204bac68471c5c1b08
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links, many pointing to compromised WordPress upload directories or disposable hosting. These elements suggest the document is designed to lure users to external sites, likely for phishing or to download further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://dadrarad.ro/userfiles/file/73621615102.pdf In PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/39243065173.pdfIn PDF document text
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/2e19pqrcdrvehoar3gonqn9kb6/35730318117.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/41111004562.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607ceccda6d68---32422763122.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/korokuwu.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/c3ade82650c05b66f26c652e3339a447/62973848596.pdfIn PDF document text
    • http://1970lions.com/clients/5/57/57eb30a5877ba0c7834658d164206012/File/56846514673.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/kunodadimun.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608806b6b8bea---fakaxidixixojumigibup.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/86fb0ed562471765cd012113ef35191d/podezotepotejirurabepe.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9fac775cf6---rizuvunimov.pdfIn PDF document text
    • http://jeansresource.com/js/ckfinder/userfiles/files/gofopira.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/jefiriwofosajimojalofo.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/161197f60537ec---kibufun.pdfIn PDF document text
    • http://mopi.eu/ckfinder/userfiles/files/ragewujirezakokisezad.pdfIn PDF document text
    • http://whs1963.com/clients/7/75/758a827d59fb1c2827eec60421ffdc22/File/lesazoxelazu.pdfIn PDF document text
    • http://deauville.ru/files/file/tudapatusak.pdfIn PDF document text
    • https://heider.ru/wp-content/plugins/super-forms/uploads/php/files/b02e2bb0fc049226def6b0e43e465aa8/kusuruv.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/fedavijaguwaremaloja.pdfIn PDF document text
    • https://smartstone.ca/userfiles/files/nolalanefatowumibosi.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/viwatesevabofirupote.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160ad0e9f3dcc7---vipakevalujebosaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=modal+verb+examples+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_off000120e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E7 10668 bytes
SHA-256: e48c5a6d175d65ecb267cfb3f01e8ec2bf7b77b7fce5dc8f8f41d5c362522085
font_01_sfnt_off00013929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13929 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001513b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1513B 21756 bytes
SHA-256: 81aeb5042f9fae5bfe4661e3ab848b4fcd68109349ca2a0c0c7a2e5cedba4a52

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