Malicious PDF — malware analysis report

Static analysis result for SHA-256 1de94e6bedb22e3b…

MALICIOUS

PDF

84.7 KB Created: 2021-07-13 22:03:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6522a9f0ad23c935367f1a4da73c155f SHA-1: 204ce48da1d3b043128b4e900780db842deda494 SHA-256: 1de94e6bedb22e3b82d3c8c4968e8c721b2e589612ed46bb9edb020f9b773600
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting it functions as a link farm. The presence of these links and the overall structure point towards a phishing or SEO manipulation attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://southtours.com/wp-content/plugins/super-forms/uploads/php/files/qt5hb0itks8tladqh72c0p8n81/29219475506.pdf In PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/c52776bc4c93b9d1fbc9265b71e5fdd6/34881085637.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/a76917fc119af8f086e6d8741ab9aa24/228902504.pdfIn PDF document text
    • https://directorvincentchow.com/fck_filemanager_upload/file/mupujezi.pdfIn PDF document text
    • https://micsys.in/userfiles/file/94626006732.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/2323cc8b64b8ced62bad640024ce04b9/52894196844.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16073759139a4c---12536964191.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8f9c401e3c---wenoruzu.pdfIn PDF document text
    • https://newtop-eg.com/userfiles/file/naporozamaxufavafefaw.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/aceb30c515c46fa7b7e6b5e67ec1ec0b/38683042476.pdfIn PDF document text
    • http://joewhitefamilysite.com/clients/59967/File/45669677686.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/nufiz.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/wafekajisibuxoxixonij.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b367043ff8c---55925295985.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b084649b27d---jevajafi.pdfIn PDF document text
    • https://koltoztetes-szallitas-lomtalanitas.com/ckfinder/userfiles/files/70872860542.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/80454465212.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/2143dca2aa757d48ab94bb3721fa66c2/24113772308.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/ali0bljrmjivruar1g0363t4ms/diroxomemezapuxekudaxozo.pdfIn PDF document text
    • https://renesens21.com/ressources/upload/files/25616448518.pdfIn PDF document text
    • http://dancedynamicsla.com/clients/38740/File/35224695335.pdfIn PDF document text
    • http://studiofantino.it/userfiles/files/mufavo.pdfIn PDF document text
    • http://ruresept.ru/files/file/64402699646.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2484dd82e4---katezaradexupakajiratix.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/uop03kev8k1v6cfmq2r6ghpgq9/ritiv.pdfIn PDF document text
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/n4bsu2685jaaa9bluid9saghhr/99423799276.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=thoracic+aortic+aneurysm+ctPDF 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_off0000e7c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C6 16848 bytes
SHA-256: 2e1b4f99f30129a2726076a462f409a8476541267abb2cc3b88943066813ea62
font_01_sfnt_off000113ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113AC 10628 bytes
SHA-256: 2af1031c9c583dcbeb8f93b27915b365ddc14a253b3f807d51e026a1bd72a63b
font_02_sfnt_off00012be2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1