Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a643eb58155292f…

MALICIOUS

PDF

80.4 KB Created: 2021-09-15 01:53:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8567b73c88057db1239393e3edfbbe34 SHA-1: 3bfbc43f0976eda32f0f737ec65781adba1e2eba SHA-256: 8a643eb58155292fed519c7623bb1c6194b7c6f84a6fc0f85544010d0dfd9606
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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.
  • 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://crysiq.ru/uplcv?utm_term=how+to+hide+screenshot+on+snapchat PDF link annotation
    • http://quimis.net/js/ckfinder/userfiles/files/bipedapetipapunaro.pdfIn PDF document text
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/iklraa8buub0so0htsikiha0r1/41490519846.pdfIn PDF document text
    • http://srcchaika.ru/files/uploads/files/moratiduvawudonewuvafawu.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/161411c3357560---gexaniwatekizisabid.pdfIn PDF document text
    • http://ned.ru/uploads/files/latujejilefolufo.pdfIn PDF document text
    • http://actlogistic.vn/upload/editor/files/93509850902.pdfIn PDF document text
    • http://begues.mobi/userfiles/file/kobidup.pdfIn PDF document text
    • https://ms1oke.com/contents/files/govavapofuvavejofumubugu.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/domeledonuz.pdfIn PDF document text
    • http://nhagiatxanh.com/public/default/ckeditor/files/50631636718.pdfIn PDF document text
    • https://thingstodobahrain.net/ckfinder/userfiles/files/44727575258.pdfIn PDF document text
    • http://lynxitservices.com/ckfinder/userfiles/files/giwisalirofuxefabu.pdfIn PDF document text
    • https://comobrew.com/newsite/images/user_uploads/file/xajujisaxapubo.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210906044217.pdfIn PDF document text
    • https://cyberbirddog.com/userfiles/files/44292314118.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1612eaba6dbb6c---gomujulosujog.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/90207120169.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/161411bf518fd6---90444710320.pdfIn PDF document text
    • http://seasonsblinds.com/uploads/ckfinder/userfiles/files/borelutivalisamelere.pdfIn PDF document text
    • https://hediyelikhanem.com/calisma2/files/uploads/94240166054.pdfIn PDF document text
    • https://frigosztufi.ro/ckfinder/userfiles/files/guwavebu.pdfIn PDF document text
    • http://www.insight-assessment.com/ckfinder/userfiles/files/22920865331.pdfIn PDF document text
    • http://vinczeandlaszlo.com/upload/34565319812.pdfIn PDF document text
    • https://wildnaturetravel.com/File/5792298540.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_off0000d70d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD70D 17272 bytes
SHA-256: 3e363842fd8032e8f19000f0ae6c73f043715b866cb07eb08ec5852dc63d2c72
font_01_sfnt_off000103a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BBA 10644 bytes
SHA-256: 46d5567dd732ca3ef47deff550ea2dad5027a2b4f8880ad3128c3b9b3266c5af

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