Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fb83b20f1081603…

MALICIOUS

PDF

90.8 KB Created: 2021-09-04 07:00:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e298d14e1f59d75fc3beee93ed9eec3e SHA-1: 9923357ad45338d346efa01d86804532ac93cd1a SHA-256: 5fb83b20f1081603dece16699e5d22d9cd033952edd5a18155078613b502d762
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the structure and URL patterns suggest an attempt to lure users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

Heuristics 5

  • 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://drafthe.ru/uplcv?utm_term=curso+de+apologetica+cristiana+pdf PDF link annotation
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/ee911c55251dfbfda35d9c1f1a8b4477/bogevi.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/21024044783.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/606cf4f4e93b0fbf2968628dfed6b4c0/defobatow.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5bf8e2f2c2---vexujefamunogededizukudel.pdfIn PDF document text
    • https://yasacompany.com/upload/files/8769033912.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073f81f11b8c---87974347694.pdfIn PDF document text
    • http://adice-area.com/pictures/files/35509087699.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096fe5cb3e23---zizosaberuxumubujeka.pdfIn PDF document text
    • http://soyaksiesta3.com/userfiles/file/jowinafibanenidimolojeku.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607440e860cf6---worimopezegorupasofajinov.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f054f01473---87265144033.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc1f0219813---28886031272.pdfIn PDF document text
    • http://ilyxrace.com/userfiles/files/sizubebumebedavopuwosul.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa301bd243---molekujavu.pdfIn PDF document text
    • http://qiuyutv.com/userfiles/files/20210813011650.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/17836389195.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/gasuwolex.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/xikutebogowu.pdfIn PDF document text
    • https://iamtimeshare.com/userfiles/file/59048612988.pdfIn PDF document text
    • http://petrduchek.com/files/72468201267.pdfIn PDF document text
    • http://ovodatar.hu/userfiles/file/17939865176.pdfIn PDF document text
    • http://ozhelalikram.de/resimler/files/fuvage.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/cdfe4d49be55156b71ac51ca8bb4ace4/87688581002.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/btslpogu6thk2carptcmlck724/dunijuxaworepevetexe.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_off0000f794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF794 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010fab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FAB 10928 bytes
SHA-256: 8a540684aac78354ece539b4ec62c9e0209ae316622e9e7e083ff5bc9ad24d28
font_02_sfnt_off000128e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128E8 20068 bytes
SHA-256: 7690a0a0034e1b98a36ee1db779015054d9a7fc582fce2f98af1669d35db585d