Malicious PDF — malware analysis report

Static analysis result for SHA-256 3afafb5ebe987ac3…

MALICIOUS

PDF

119.8 KB Created: 2021-09-07 16:58:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b7b845eab3e7887cb05191a7e91000da SHA-1: 15eab0f5ea1e5ede5381a7b96eb4a9660622aa16 SHA-256: 3afafb5ebe987ac305b1fc52aba36d4375ce71abb96513b0a7a2185e19d1c424
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is often used to download and execute further malicious content. The presence of a 'Password-protected archive handoff' heuristic, combined with numerous external URLs pointing to PDF files, suggests a phishing or malware distribution scheme. The embedded JavaScript likely facilitates the download of a second-stage payload from one of the provided URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://cructi.ru/uplcv?utm_term=tabela+periodica+pdf+completa+2019 PDF link annotation
    • http://www.tamtrebinhminh.com/public/files/rufiwo.pdfIn PDF document text
    • https://xpress2.eu/ckfinder/userfiles/files/28933686110.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/zukuzitezidesudat.pdfIn PDF document text
    • http://doggystylzgrooming.com/admin/photos/file/favipaxebatukabevowo.pdfIn PDF document text
    • https://lwim-ouargla.dz/ar/files/79889399905.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbe5fd5d4a4---15973810698.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/71225202827.pdfIn PDF document text
    • https://rajakedua.com/contents//files/80318299307.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/73588654736.pdfIn PDF document text
    • http://slsnn.ru/content/files/sunubezewuvipodevivuxe.pdfIn PDF document text
    • http://netpost.vn/upload/userfiles/files/57824621999.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dcf8fcdaab---96351555383.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dc9644862e---rofemesusizunawavabij.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/kozozuro.pdfIn PDF document text
    • https://www.latentoac.com/portal/wp-content/plugins/super-forms/uploads/php/files/ag4sh5t1tfhq2f12qdq0qrhujg/radugewavovadeg.pdfIn PDF document text
    • https://wodgluch-projekt.pl/userfiles/wisodiwogabunaxomukeve.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/ee3ac3185139115b500e7bf4559c3716/fuvanipimawurofum.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/xorivumupanileridezesisu.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1611476c69d151---53341924558.pdfIn PDF document text
    • http://avon-bratislava.com/files/files/zogokeligo.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/38846238052.pdfIn PDF document text
    • http://startent.ru/SITE/files/editor/file/bokolubeketapizabugipovu.pdfIn PDF document text
    • http://wsp.pl/userfiles/file/92918950494.pdfIn PDF document text
    • https://vocembalo.ch/userfiles/file/zonakiwuzabuwadufexora.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_off00016a0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00018224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18224 11076 bytes
SHA-256: 75d67ea8999e019278af41a0565c70fc01b2c035f35c14a038103f34feee51d8
font_02_sfnt_off00019bcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19BCD 21304 bytes
SHA-256: 7d0b1d7b0e348e5e10d45e68dcae037190b70fcbd6e4371808fb18e52ff63081

Open this report in the interactive analyzer, or submit your own file for analysis.