Malicious PDF — malware analysis report

Static analysis result for SHA-256 df1c56019a7d2c58…

MALICIOUS

PDF

71.6 KB Created: 2021-09-05 19:20:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 730bda205ac7e8b07069123e485a7001 SHA-1: a0458ab4c2bc88cafd7bc05d5c7c001d6317426f SHA-256: df1c56019a7d2c58362dc8b7df051e572e0b239ea0a8884c7bdc62605bbd21f5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. The heuristics indicate that the PDF acts as a link farm, directing users to various external URLs, many of which are hosted on compromised WordPress sites. These URLs likely serve as landing pages for phishing attempts or further malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • 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://garglob.ru/uplcv?utm_term=fases+o+etapas+de+un+proyecto+pdf PDF link annotation
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ecd8811304---18307029385.pdfIn PDF document text
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/382a72c3e777a85d0a85547b88704d41/68078674887.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ae3915b4fda---29208276608.pdfIn PDF document text
    • https://casalindasbakery.com/ckfinder/userfiles/files/lanorawafak.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16129362a7271f---69048063826.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/63648829889.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/loa39git7pan6r17jhqreegvb0/1699289921.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/sgbqn252nt22nj57bmd9799im3/figebamadufuludalel.pdfIn PDF document text
    • http://greenld.com/userfiles/gutuwe.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/gufanuzog.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/lvf8rc1pgro2aur0mkv9ugnfdm/kafidolatami.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/ddee0d0859924d4062e36198bb8415c4/zenapakogigetatoj.pdfIn PDF document text
    • http://jr-bang.com/uploadfiles/20210624113751.pdfIn PDF document text
    • http://springgalleryng.com/Images_upload/files/xeruwapivekomuvenewidegok.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160986a2b88023---87926737914.pdfIn PDF document text
    • http://girc.ncue.edu.tw/ckfinder/ckfiles/files/tevepunowuvozidovimififet.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608609cd8a439---sixogexabixufabufasatufen.pdfIn PDF document text
    • http://vdavloeren.be/userfiles/files/solotopaketanuf.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/rimozufipi.pdfIn PDF document text
    • https://airbays.com/userfiles/file/mewagoxepirivebutoduxo.pdfIn PDF document text
    • http://cansuyu.org/resimler/files/nuvuxoxaginosisopi.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/939145468abb0afc0a366baa23fc717b/kawitusemupuzevi.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/vuxiwalukozonavuv.pdfIn PDF document text
    • http://idolyokocho.com/js/ckfinder/userfiles/files/naramofaxuratumesira.pdfIn PDF document text
    • https://cnn-logistics.com/asset/files/55868997340.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_off0000b578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB578 10668 bytes
SHA-256: 91abe2abf8d7ac35c2c62e6108cee6608a6a6e5cd5c02e02b6b9d8430ef2edc2
font_01_sfnt_off0000ce1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE631 17660 bytes
SHA-256: 0c1001533c3485a6cb6093f9f3517146281b0867591175f0522ed4f68e26a1eb