Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fa0190fc42669a1…

MALICIOUS

PDF

87.2 KB Created: 2021-09-14 11:21:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2dcbe32fcabeee4c54b870252e86ef7b SHA-1: c34be4fc7e93d8c72452839a29264e2035b22c1a SHA-256: 5fa0190fc42669a1adcc629c366ba3b98ff448ba920d25b4398f701d8bc90586
204 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external links, some pointing to compromised CMS uploads. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document's content is designed to trick users into installing software, a common tactic for malware delivery. ClamAV detection further confirms its malicious nature, identifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://maytinhdalat.vn/images/uploads/files/94220627135.pdf In PDF document text
    • http://unityproductions.com/upload/files/devonugibewuk.pdfIn PDF document text
    • https://hoangvan.vn/wp-content/uploads/files/90929009867.pdfIn PDF document text
    • https://wcfkenzi.com/ckfinder/userfiles/files/84691230472.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131721e7a013---nizigatipugibuvagifunuwi.pdfIn PDF document text
    • http://m-styleauto.com/js/upload/files/11064640543.pdfIn PDF document text
    • https://www.adoz.cz/ckfinder/userfiles/files/fexivolejaxeve.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/15988040468.pdfIn PDF document text
    • http://campfirewtx.org/userfiles/file/jomobapejeme.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/vagokaxelazufuzikamonax.pdfIn PDF document text
    • http://aotwresort.info/ckfinder/userfiles/files/pafitikataranejizek.pdfIn PDF document text
    • http://plafondchauffant.fr/img/user/file/19418189272.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16131cec767423---56925988846.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/gupetaboraso.pdfIn PDF document text
    • https://rotitelor.com/contents/files/65898803318.pdfIn PDF document text
    • http://kozhencherrymtc.org/userfiles/file/45694196531.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/zitalefopunelas.pdfIn PDF document text
    • https://toolsatool.com/userfiles/files/86152813996.pdfIn PDF document text
    • http://winterwonderlandzundert.nl/uploadimages/files/99397005340.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/82155845919.pdfIn PDF document text
    • http://joomlacode.org/fckeditor/editor/filemanager/img.php?file=file/98054134330.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161390081979d3---jisifodene.pdfIn PDF document text
    • https://bostoncake888.com/UserFiles/files/getelupuwiwivu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=can+i+run+android+apps+on+linuxPDF 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_off0000f02b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02B 10388 bytes
SHA-256: f51e8fc4757fb6aa7be7a98d33c594f8ad0fcec6791e69d5917e812e1cd894c8
font_01_sfnt_off000107b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011fcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FCB 17996 bytes
SHA-256: 56edd3953366526683c9d679b3b5f57b7d6f172d6a815ec16439e69af01ba977

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