Malicious PDF — malware analysis report

Static analysis result for SHA-256 66aa1eea3efa287a…

MALICIOUS

PDF

77.2 KB Created: 2021-09-19 04:53:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 8ede49da4e6a9151e068227efd6b6a94 SHA-1: 3ecc55919344186094e5d0d311720cd5304616ae SHA-256: 66aa1eea3efa287a74c4cc91856ee4d54e195745fb89115e6acc44ef3a8b73f4
172 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a link farm pointing to multiple distinct hosts, many of which appear to be compromised or disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious content or facilitate downloads. The presence of embedded JavaScript suggests it may be used to execute further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://rama-sp.com/rama/webroot/js/ckfinder/userfiles/files/76270192896.pdf In PDF document text
    • http://dierenwinkelindex.nl/images/uploads/xebexosatavezazopife.pdfIn PDF document text
    • https://asztromiskolc.hu/ckfinder/userfiles/files/40064533192.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/cbfb2ba15849fc3c58dda1c3926f2e94/fovevasugoxutoxezoziluven.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613707b039892---1344579853.pdfIn PDF document text
    • https://kirmatas.com/userfiles/file/88931954449.pdfIn PDF document text
    • http://azizavacanze.com/userfiles/files/61125855324.pdfIn PDF document text
    • https://creativitagh.com/pevron/www/img/file/34111604686.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/e05afb140aed291da9b830719a84bbfa/99991020919.pdfIn PDF document text
    • https://equalitas.es/userfiles/file/tibasoxevapuwufurimafowe.pdfIn PDF document text
    • http://marmaraisg.com/images_upload/files/guwulatoxasi.pdfIn PDF document text
    • https://fitness-sport.it/userfiles/file/zomedijezufumowib.pdfIn PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/38358276855.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/57345831674.pdfIn PDF document text
    • http://vinhthuan.vn/upload/files/11446475534.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/boloje.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///46537689557.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/5645tll28p7bcg5lq5l4d3hs54/37195756804.pdfIn PDF document text
    • http://industra.sk/userfiles/file/mubotelijudovemapetevav.pdfIn PDF document text
    • http://gerastar.com/userfiles/file/73290244666.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/95246631721.pdfIn PDF document text
    • http://fisioterapiasuzzara.it/userfiles/files/titarowi.pdfIn PDF document text
    • http://xutricolor.com/uploadfile/files/46343246721.pdfIn PDF document text
    • https://dailyiat.com/html_upload/file/robajovepom.pdfIn PDF document text
    • https://sikanderajam.com/Robinson/ckfinder/userfiles/files/10012499340.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=ghost+of+sparta+cheatsPDF 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_off0000c817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC817 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e02e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE02E 10372 bytes
SHA-256: d1989c2d0e154a3713ea94db5542bb2ef0952363062e64f189d39f8de85d1590
font_02_sfnt_off0000f7dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DD 18112 bytes
SHA-256: f4a2c93b21f7b18e656cff3df03e5cbdcea3d285f846f7d1567e5b3248d8ce63