Malicious PDF — malware analysis report

Static analysis result for SHA-256 94353071750fef0c…

MALICIOUS

PDF

87.7 KB Created: 2021-06-29 07:45:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 119ba0e9e3aea5e278ecefc9dd0a452a SHA-1: 94d128c0dc8d06c2faeaa4e52a3f980e35f57ff5 SHA-256: 94353071750fef0cb737a8f3422b394e749120f095c38c23c1c770173886e0ca
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the heuristics (link farm, compromised CMS upload) strongly suggest the PDF's primary function is to redirect users to malicious external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://coretry.ru/uplcv?utm_term=drama+queen+download+mp3+song PDF link annotation
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/c76525db252ee5becce291a99eeb4f05/nikozabixeta.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a8acfd9748d---wugasabip.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/h1hd20nd69kb867no0u8n5v1u1/70339279564.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16090410b49163---48224345153.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/3b23cbfaf65c1b5f8dec66722fbcbdb1/62339881570.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/6r2evggrq5ppjgpnk6t641j6ts/4161697061.pdfIn PDF document text
    • https://www.bakirkoytemsilcisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607344ad17f5e---pajowobosamedexore.pdfIn PDF document text
    • http://mdsalon.ru/img/lib/file/55449180651.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b9f9c955df1---leren.pdfIn PDF document text
    • https://mabuksusu.com/contents//files/58304882408.pdfIn PDF document text
    • http://utopiasacramento.org/clients/0/07/071cdeedc048305be324eb10ab8031d4/File/sipadazabo.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6b4f1df4e---natasezotasitulazavev.pdfIn PDF document text
    • http://kath-kiga-bw.de/bilder/berichte/file/logazeze.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/vafijagapivetobi.pdfIn PDF document text
    • http://magooferta.pl/uploads/fck/file/nosepip.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5c5863cb1---tolet.pdfIn PDF document text
    • http://asianaccounting.com/admin/fckeditor/userfiles/file/82050674964.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2f3a3b87f---wajiwewinibelujaguxetuw.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/3nakre3bqldupk99hiuug3sgv9/47015204835.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16083a9c4cffd2---40351291366.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/ni5g9skb0cb1sdcscrk6kgvf16/33249709215.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/bekozeka.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4dae335dfb---90823453812.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbaa3cbe016---37258512505.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_off0000f34d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34D 17096 bytes
SHA-256: 16defe116230d4b320283d0349af67e3e9d8041303b45c50d0d74fd777c18074
font_01_sfnt_off00012022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12022 11052 bytes
SHA-256: 8f8bd5b6756a9196bf63511d898b57621f0c3c8a820a35166e6368e4528ef31b
font_02_sfnt_off00013965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13965 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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