Malicious PDF — malware analysis report

Static analysis result for SHA-256 824f56d7efab89c7…

MALICIOUS

PDF

84.6 KB Created: 2021-09-04 15:35:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0396822c4e2eecbf572ac1bd93bc5890 SHA-1: f0d6038a0a094dff2c565b493d33c10200415577 SHA-256: 824f56d7efab89c791e6b2212fedae643f1fb0b729992011b4914f1966ff0122
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links and the heuristic 'SE_DOWNLOAD_BUTTON' indicate a likely attempt to trick the user into downloading a secondary payload or visiting a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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 https://crewmak.ru/uplcv?utm_term=delhi+polytechnic+syllabus+2019+pdf PDF link annotation
    • http://www.valaisconsulting.ch/file/redogosol.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa248080b35---rapigajajosasobosu.pdfIn PDF document text
    • http://lex.tj/img/file/87857185399.pdfIn PDF document text
    • http://atya.eu/files/file/wozosunuzus.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/6b1f8e894e81d668517a5e188c2bd617/budekobopujivogalasege.pdfIn PDF document text
    • http://bielwod.com/userfiles/file/silow.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/54309932013.pdfIn PDF document text
    • http://computerdoki.hu/user/file/74901672094.pdfIn PDF document text
    • http://life-worldwide.org/assets/uploads/files/1067998302.pdfIn PDF document text
    • http://mabo-meccanica.eu/userfiles/files/59259581913.pdfIn PDF document text
    • http://lindseyderence.com/userfiles/files/mugawizevorewafelofulot.pdfIn PDF document text
    • http://agrion.org/upload/fichier/35457813867.pdfIn PDF document text
    • http://emanuelarombiarchitetto.eu/userfiles/files/farawawasuvakinebe.pdfIn PDF document text
    • http://banghetretruc.com/media/ftp/file/74711268631.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/976e5679b9d66b2c4df7e0d7e852ba2b/darokuwofipazivojejenin.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/amker57dgj8r6fd7hc719p6kj8/siputivolageku.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/molixotujemepetazud.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d680360842---46272344428.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/k56rbuevcfrj3u715phas798g1/16463136970.pdfIn PDF document text
    • https://www.prestigeautobody.com.au/wp-content/plugins/super-forms/uploads/php/files/e2d60300ce06152d9e0acedcbd3a818e/bubawitidoni.pdfIn PDF document text
    • http://pusheng168.com/uploadfiles/20210701121134.pdfIn PDF document text
    • http://usaoxin.com/userfiles/2021-6/file/rumutuwapem.pdfIn PDF document text
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/tsb1ntshdt7u67gnbcik3grgm8/32516121015.pdfIn PDF document text
    • http://waetsukai.jp/system/ckfinder/userfiles/files/gimovakar.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_off0000e0e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f8f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F7 18964 bytes
SHA-256: 234c349523d24aa2644331b5fa76135f29fb3e9495332aba54185d29e5cafa31
font_02_sfnt_off000129ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129CA 11432 bytes
SHA-256: 72e3c8ff221bb3aeb076816fe7edf3955931b3a0cf4a3508a1eaa991cc9c167f

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