Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbd7d4c7e837b182…

MALICIOUS

PDF

91.0 KB Created: 2021-09-04 01:13:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c563f3e30987ba82adf909db0fa68240 SHA-1: 65f6bd8d2c352f851190735d4b4a6b14d912f0a1 SHA-256: fbd7d4c7e837b18270cc962be004afe6093fb01c58fabbd8a5caadf883a45482
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs, many of which point to potentially compromised websites or disposable hosting. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate this file is likely part of a link farm, possibly for SEO manipulation or to distribute malicious content. No scripts were extracted, but the structure suggests a malicious intent to redirect users to other potentially harmful resources.

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 http://jshtextile.com/UserFiles/file///59010444577.pdf In PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/jobefasitifepaxudinu.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/cba316c9cf31ba971294e6f7ce91199c/16106986768.pdfIn PDF document text
    • https://snqrsl.quebec/upload/editor/file/73459629184.pdfIn PDF document text
    • https://srmhomes.com/images/bulk_images/files/43411122935.pdfIn PDF document text
    • https://auditorescr.com/ckfinder/userfiles/files/62307855063.pdfIn PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/62309583020.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/60221960415.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/varupugemajupotar.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/9qcmvuo57nstu4l62riiil3jjq/79702057002.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/zixiwor.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202108282053222741.pdfIn PDF document text
    • http://www.badischer-kunstverein.de/ckfinder/userfiles/files/32437535655.pdfIn PDF document text
    • http://d4scanada.com/clients/8/81/81a8d3ecf29e0a7d9042e8364394d873/File/73559285484.pdfIn PDF document text
    • http://abnicum.com/files/file/mipefap.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abfd5930187---28747546979.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/d995cf43f3670ace7447a2ba4961f16f/nejenovi.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3b7724722---35376313756.pdfIn PDF document text
    • https://amgaa.org/temp/files/51376814537.pdfIn PDF document text
    • http://ziguratex.com/helpdesk/app/webroot/img/userfiles/files/16034406395.pdfIn PDF document text
    • http://dighakanchaninternational.com/FCKeditor/file/nosuduturuvetowe.pdfIn PDF document text
    • http://ahsaipu.com/v15/Upload/file/202157125546985.pdfIn PDF document text
    • https://kingdomdatesuae.com/userfiles/files/xikerakalupenazofupar.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/1951855069.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=konsep+etika+moral+dan+akhlak+pdfPDF 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_off0000ff03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001171a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1171A 10848 bytes
SHA-256: 616fa26c494efa5ed2ac0f0a9a7b10bca5e6823c962c0d123069b4518d0117b9
font_02_sfnt_off00012fe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FE6 17904 bytes
SHA-256: 78a2ade52d1fbe155c8c49fee01118691879ecc6df488015f8bff34cff1fc03c