Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7cd30195b54858e…

MALICIOUS

PDF

70.1 KB Created: 2021-09-25 06:08:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e9aa67189464c0dcb0f7d8984512d231 SHA-1: 2a4eb7733e9b92ad42ff469ab177ac0c76a33b70 SHA-256: d7cd30195b54858e4ccaf1e42c199362653dc26e1223323eadb078c321ee602f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://smidgel.ru/uplcv?utm_term=delphi+10.4+android PDF link annotation
    • http://agriturismocorteerbatici.it/userfiles/files/gadamemila.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.com/ckfinder/userfiles/files/42784320866.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/99160169703.pdfIn PDF document text
    • https://lapakunited.com/contents/files/19886836256.pdfIn PDF document text
    • https://shian-jin.com/UserFiles/files/nubedoxavomelo.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410f1c24b76---tizin.pdfIn PDF document text
    • http://hkxhjfc.ltd/uploads/files/20210921173129.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/9c1bbb6696ce4b3df79b5f7ac07adf75/mazitidovidibin.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/bezifamubidujekavovis.pdfIn PDF document text
    • http://parcroyale.hk/userfiles/504517319.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/debewanarilesibozij.pdfIn PDF document text
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/040330036044.pdfIn PDF document text
    • https://ptogel1.com/contents/files/88290058087.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/77343565743.pdfIn PDF document text
    • http://eaas-journal.org/survey/userfiles/files/lotezixesafumatirefudo.pdfIn PDF document text
    • http://artepcb.com/upload/files/69916970562.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16132cf4ced918---83713866822.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614473663c329---98584034706.pdfIn PDF document text
    • https://mimpidia2.com/contents/files/liwupesawakelozutefab.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ed53444bbc---32933263439.pdfIn PDF document text
    • https://ibericadearmerias.com/file/soxekemidoxixaxivok.pdfIn PDF document text
    • https://coherence.cz/userfiles/file/vijizezaxonoladofulo.pdfIn PDF document text
    • https://www.adom.biz.pl/ckfinder/userfiles/files/diroveseturoxip.pdfIn PDF document text
    • http://tonioloclaudio.it/userfiles/files/74898677887.pdfIn PDF document text
    • http://mapect.com/upload/fckeditor/file/28041248197.pdfIn PDF document text
    • http://www.globalnautique.nl/upload/files/zetolo.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_off0000b253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB253 10540 bytes
SHA-256: fa4da544497c41e4708c9543f2cd3e12f1181660c78205a2eadae8cc339369c4
font_01_sfnt_off0000ca35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA35 16116 bytes
SHA-256: 764597d15d6e4e99d4d6e25c5e2a84fe7f4d8faa9d6ad31fe881044d4bd021dc
font_02_sfnt_off0000f2e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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