Malicious PDF — malware analysis report

Static analysis result for SHA-256 9be69dd9a931d64e…

MALICIOUS

PDF

70.3 KB Created: 2021-09-09 02:09:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b04991a59dc36fdfe7b6c165ae5c3569 SHA-1: 168baf7eb98a52f27f33429ac2876e7b34a39c72 SHA-256: 9be69dd9a931d64eb56f52647be23c18476799e7c6216c6e182290664665f34c
164 Risk Score

Malware Insights

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

This PDF sample was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains embedded JavaScript and a link farm pointing to numerous disposable domains, suggesting an attempt to redirect users to malicious sites. The presence of external URIs and compromised CMS upload links indicates a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://medvor.ru/uplcv?utm_term=how+to+enable+3rd+party+apps+on+android PDF link annotation
    • http://stickerbarcode.com/file_media/file_image/file/durexunule.pdfIn PDF document text
    • http://cassotech.nl/site/data/ws/files/dibimabimedotebewijume.pdfIn PDF document text
    • https://bevasilicones.in/userfiles/file/xiwisi.pdfIn PDF document text
    • http://burchiellati.com/file_fck/file/liwenusivibovusutat.pdfIn PDF document text
    • http://kaizousha.com/js/upload/files/kiruxoda.pdfIn PDF document text
    • http://archi-m.ru/userfiles/file/60420647208.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613328afe3316---jojibipov.pdfIn PDF document text
    • https://akemi.ro/hirek/file/43099332022.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/sogivowebose.pdfIn PDF document text
    • http://1-champagne.com/blog_images/blog_/file/16671289080.pdfIn PDF document text
    • http://airmon.hu/images/files/sixevopigadivaxis.pdfIn PDF document text
    • http://alfonsoguiggiarchitetto.it/userfiles/files/23386824814.pdfIn PDF document text
    • http://kirakuramen.com/uploads/files/93162738670.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021090316533673.pdfIn PDF document text
    • http://fastcredit.ge/userfiles/file/83799270804.pdfIn PDF document text
    • http://revistaspontan.ro/assets/ckfinder/core/connector/php/uploads/files/68048767307.pdfIn PDF document text
    • https://classoft.ro/userfiles/file/27737740277.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f527546e54---gijuxowipawivanubomejiw.pdfIn PDF document text
    • http://highendschmiede.de/highendfiles/file/75685201054.pdfIn PDF document text
    • http://sarljarry.com/userfiles/file/32479178869.pdfIn PDF document text
    • http://technoauto.jp/js/upload/files/visinavo.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/xifijepalok.pdfIn PDF document text
    • https://ksi-system.pl/editorfiles/file/wavinome.pdfIn PDF document text
    • http://amongelite.com/ci/userfiles/files/kudawitenexukapuwanu.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612f96296fb7f---60836487003.pdfIn PDF document text
    • http://geofer.eu/userfiles/files/sewasal.pdfIn PDF document text
    • https://olboihorgaszto.hu/editor_up2/72332209261.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_off0000b44f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB44F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC61 14980 bytes
SHA-256: 4a0c6067a71f789be600059ad90907f01461b3d79032018bf48021271c46e0f0
font_02_sfnt_off0000f255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF255 10888 bytes
SHA-256: e6e417b78dc449b052f6be60e5687cc3bbd094ef1da658e4f214fe0b4c2e4de7

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