Malicious PDF — malware analysis report

Static analysis result for SHA-256 b51f020fe72df1eb…

MALICIOUS

PDF

126.0 KB Created: 2021-06-08 22:09:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 94e021c680a3e8c5d097745933b5f191 SHA-1: 499e8eeb5a98e04143fba826537e79e083005036 SHA-256: b51f020fe72df1eb58f35cd1b936f50ed673f2387114d1056876712173958c1c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://philabc.ru/uplcv?utm_term=go+math+3rd+grade+chapter+1+answer+key PDF link annotation
    • http://boxethai38.comupload/file/lokiluzivoxuvupe.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/7765457642.pdfIn PDF document text
    • http://geose.ru/userfiles/file/88725485479.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/nenuvizobobazikizadogep.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/ich2ja2pdgpeugbkrjcmkf3493/15705363213.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/1790a61bd6cff1733311f29221e3ac35/wunuvuxuxi.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/zaxikusoxomaroderit.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/a8cc0db4630405a46c4f028b056cab2d/foxonarivegaliwekukitajev.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/e19ec99ed9212baeded051dd281d0275/21455037419.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609aa3f78c1fd---25995715252.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606cce5ae685f---53534512774.pdfIn PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160712d42c1b45---sevoto.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/1fe6ea8cf9955422191eb87562f15a9c/lunujerinas.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/db5eb8ce77bdaad1293b84bbc12e5dcd/mewagafokug.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7378ec6c21---jufibiragewe.pdfIn PDF document text
    • http://asfus.net/virgsurv/userfiles/file/60044534078.pdfIn PDF document text
    • https://gyn-koe70.de/obrazky/file/60688656241.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070bd92b09f1---69429041540.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00019748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19748 5960 bytes
SHA-256: 804b5e527d20ae3edec47fc78baa9fbb3c1e335cb650f33576a282a886070fdc
font_01_sfnt_off0001ab8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AB8A 11668 bytes
SHA-256: c18b543955474c4abbeb6593cd35f3d97f85ec28d1bd2966758d21d1f5dc8702
font_02_sfnt_off0001d2ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D2EC 16148 bytes
SHA-256: 9024db90cb194daeb4500aa8c1c85c9d66accab49bdde2d4a43fe9020f6c09dd

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