Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c8a67e434e4f293…

MALICIOUS

PDF

76.0 KB Created: 2021-09-17 06:53:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: aae065e55b4c3e8ed9be1c1256eb0173 SHA-1: 8c0b09d1cdd5b34d778b8c120449ab9c39a064a2 SHA-256: 6c8a67e434e4f293db7f207265e5f15fb4bb3dfd5d5989df1534666d491a480c
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS uploads or disposable hosting. The ML classifier strongly indicates maliciousness. While no scripts were extracted, the structure and embedded URLs suggest the document is designed to lure users to external sites, potentially for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://ckmusicdesign.nl/userfiles/file/fukokanugiborefog.pdf In PDF document text
    • https://akapacha.com/userfiles/file/28540872548.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613582e970b8b---ramapagaruvuxepupepupoliv.pdfIn PDF document text
    • https://ptogel2.com/contents/files/29190695163.pdfIn PDF document text
    • http://ryukatsu.com/userData/board/file/pivokimedapag.pdfIn PDF document text
    • http://namlinhchisapa.com/userfiles/image/file/gebesudekufabuzegejeve.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/n8rpapkg463u19nl8chqpffgg6/vikawewire.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a08b8239c---pigurunotosodasulerapen.pdfIn PDF document text
    • http://astprom.ru/sites/default/files/file/38320618300.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/2b4ea36087f2da6c464d2faddf52bf25/87870190131.pdfIn PDF document text
    • https://sieuthigo.vn/upload/ck/files/54159525187.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/xosoputonemuzadivami.pdfIn PDF document text
    • https://ibliberia.com/ckfinder/userfiles/files/zajeb.pdfIn PDF document text
    • http://sgrappresentanze.eu/userfiles/files/77855333307.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/lurujokopowulufudakiv.pdfIn PDF document text
    • http://eldorautomaticgates.com/UserFiles/file/34754168843.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/25204733188.pdfIn PDF document text
    • https://5ky13lu3-1251.com/contents/files/likize.pdfIn PDF document text
    • https://korovin.org/site/img_ufiles/soladevuvudud.pdfIn PDF document text
    • http://anbao.vn/uploads/userfiles/file/34506738738.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/1613be024badb3---52754287486.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=prime+video+mod+appPDF 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_off0000c4a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dcba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCBA 17996 bytes
SHA-256: 37ea47afeb2c5b849bf455bcf68014c8bbbd33c656f1d40cef113f5397dae0ed
font_02_sfnt_off00010bcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BCB 10204 bytes
SHA-256: 98e0097c774871a2701dc9b9bfea693abaa98de419e7159f0b5f6327bfd30939