Malicious PDF — malware analysis report

Static analysis result for SHA-256 86b026a6799724ef…

MALICIOUS

PDF

88.8 KB Created: 2021-09-14 08:50:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 42987f31f0056ef9fd1163c56e5b52b5 SHA-1: a906a653b0d5de108f768fec4cae1757d6fe1b68 SHA-256: 86b026a6799724ef74e6f4f991b1db381cb451bcfd770cc751e68bac297b9848
204 Risk Score

Malware Insights

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

The sample is a PDF document that contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates the document's content is designed to trick users into installing malicious software by posing as a necessary update or extension. The presence of multiple links to potentially compromised or disposable hosting further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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 http://hourinkan.net/js/upload/files/22808230523.pdf In PDF document text
    • http://curvesncontours.com/userfiles/file/dijagofavefalazedurimabus.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613046387695f---roturulobi.pdfIn PDF document text
    • https://petala.gr/userfiles/file/jafasiburemurejugo.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-9-1/20210901112905140397.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/84529212256.pdfIn PDF document text
    • http://shangyi-pump.com/uploads/file/071559048275.pdfIn PDF document text
    • http://stonebreaker.at/2864377394.pdfIn PDF document text
    • https://ms2gacor.com/contents/files/kejagiterarigaroko.pdfIn PDF document text
    • http://secretinvitation.net/images/files/xasaw.pdfIn PDF document text
    • http://boxshop.mn/userfiles/files/nusefubojovigujanoleximek.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/a45d4fb69f761172813fb32e3edcbe88/wazexiro.pdfIn PDF document text
    • http://usmleworkout.com/files/file/xubagexitule.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130061723c71---rinuz.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613866d1a48b2---kajepelafutulojowomozu.pdfIn PDF document text
    • http://blccy.com/userfiles/files/garosawelives.pdfIn PDF document text
    • http://ingpoggi.eu/userfiles/files/jafogoxotiz.pdfIn PDF document text
    • http://miyozenemeryville.com/uploads/files/80703114346.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-6/20210906055107757264.pdfIn PDF document text
    • http://alwaditrading.com/userfiles/files/86055634441.pdfIn PDF document text
    • https://intersensor.ro/v2011/Files/fck_upload/file/64638571747.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16138566fc053e---rasajimajererosovimekuwi.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/naratulu.pdfIn PDF document text
    • http://videotour24.com/data/fckupload/file/beganolasozalipitevasa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=chrome+not+loading+on+androidPDF link annotation
    • 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_off0000f735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF735 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F47 17960 bytes
SHA-256: 4f0d8332ff9b83e8e8079f66018df5916ceb3857cac77b0b1a3cdb25f7117259
font_02_sfnt_off00013dde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DDE 10556 bytes
SHA-256: d2f5609a136a9605d56baa05b5c0884211f6394bb85f52aa3b3995e75ccbc17d

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