Malicious PDF — malware analysis report

Static analysis result for SHA-256 8491eff5c92bd780…

MALICIOUS

PDF

70.8 KB Created: 2021-09-03 12:43:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 29b441f10c142fdd8780da0c26c61a59 SHA-1: 383555da3e52da033886db415f56fe64f0105f34 SHA-256: 8491eff5c92bd7801ae191c44cd24b09a943faf1e1b2d475d79bda699f6872f8
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of link farms and compromised CMS upload links suggests an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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://archism.ru/uplcv?utm_term=abbyy+pdf+transformer+plus+keygen PDF link annotation
    • http://www.heksan.com.pl/file/fegakodupazokisugib.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/cdi9gg1lgkngtkfqoslrbottu0/megejawe.pdfIn PDF document text
    • https://mandarinusa.com/userfiles/file/1630526692.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606e20d508be2---budinaluzid.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0315a94c42---wojipewurasukuzi.pdfIn PDF document text
    • http://detaycopymatbaa.com/userfiles/file/korowedinufu.pdfIn PDF document text
    • https://bulendengin.com/upload/ckfinder/files/radokodediwuriwaj.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16082bc6099c4c---rilovujexaragewetodut.pdfIn PDF document text
    • http://yanartextil.com/firma/files/pamas.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/7143c714185208d98d39050ea3fc6d35/vosus.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/fe77998d3c48c6195f8fd7e53eb0f2b5/12860353948.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/nofewotipakaxoparezewej.pdfIn PDF document text
    • http://nakakinpump.kr/fckeditor/upload/file/jegepedo.pdfIn PDF document text
    • http://ensky-chemical.com/upload/files/dobulubunifa.pdfIn PDF document text
    • http://maasmartcity.com/userfiles/file/rawod.pdfIn PDF document text
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/4f849ee5ab65f2632f223c26b250cb9a/92675230543.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160909dd722c79---10140242989.pdfIn PDF document text
    • http://akvatoria.by/UserFiles/files/bufigutofuradanufopulu.pdfIn PDF document text
    • http://www.doctor-carpet.com/wp-content/plugins/super-forms/uploads/php/files/duajbcmj7brlotg4r1b262v9e6/30522197648.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/bafobalepetolupukixid.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1f828e52a8---25553618881.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_off0000b0b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0B3 11176 bytes
SHA-256: ae72fcf6be4a6cafc0a6e1c913dff4e9c0ea882b88023021a9351d85c915cc6b
font_01_sfnt_off0000ca75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA75 16080 bytes
SHA-256: 9f4607cb38660ded6ce635c3ad27aca38960a163d40c7db812753c25764e204a
font_02_sfnt_off0000f3d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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