Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4013190ed8449f2…

MALICIOUS

PDF

86.6 KB Created: 2021-09-18 11:49:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 463216c40eb9298d66f10e72aeb23d52 SHA-1: 7d18c6cc08d3248e347c219b6daa51d645556aa0 SHA-256: b4013190ed8449f21cd383c7938352f978f8a38936578166e55afacfe4207e59
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

This PDF file contains embedded JavaScript and multiple external links, some pointing to compromised websites. The 'Clipboard command execution lure' heuristic indicates the document instructs the user to copy and paste content into a shell, a common tactic for executing downloaded payloads. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://canvangdientu.com/images/file/gemesexugotapizuze.pdf In PDF document text
    • http://d-a-s.cn/userfiles/file/fomajoxerijini.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613f13684007a---tomerasi.pdfIn PDF document text
    • http://www.tlo.ntou.edu.tw/ckfinder/userfiles/files/gakoxizasozojekutu.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/tenibupabobuminusika.pdfIn PDF document text
    • https://www.alitec.es/js/ckfinder/userfiles/files/xuxuborozenunezivigazowup.pdfIn PDF document text
    • http://ccsilver.kr/files/fckeditor/file/5113189656143c08167d6e.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/161317ead07b78---9148674325.pdfIn PDF document text
    • https://mytshirtcreator.com/app/webroot/files/file/wobafowovidedoweluf.pdfIn PDF document text
    • https://astoriareiki.com/wp-content/plugins/super-forms/uploads/php/files/0a6c6cf774bb93536083cba8089ac05e/1455199275.pdfIn PDF document text
    • http://ssaisarang.com/ckfinder/userfiles/files/zikuwifurejiwejanapevi.pdfIn PDF document text
    • http://hacoauto.vn/upload/files/jifitejimetibiwenagoso.pdfIn PDF document text
    • http://geometramaurotozzi.it/userfiles/files/5777387461.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/38670419192.pdfIn PDF document text
    • https://vinocastillo.hu/editor_up/timodemobarexiriguka.pdfIn PDF document text
    • http://ducthai.vn/userfiles/file/guboxibi.pdfIn PDF document text
    • http://opuspointpartner.com/ckfinder/userfiles/files/44840766881.pdfIn PDF document text
    • http://adec-interiors.net/Uploads/file/jojeregofarobokimagoxes.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/00106a4e1dbbf44ea9f2944d8307b631/bafemixewaxavalosifudilu.pdfIn PDF document text
    • https://hongdung.vn/ckeditor/images/files/25213940703.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=dockerfile+arg+envPDF link annotation
    • https://tes-sys.com/uploads/ckfinder/files/20210917/16318350857581.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE357 10404 bytes
SHA-256: 39e74e62e14e82353e1f663e3d8fecff86564349613ab41b32b9af1fad81fc1a
font_01_sfnt_off0000faf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF7 1924 bytes
SHA-256: 1c9e714e8689aff8cfaaa860f23decbbfa3c20a4712b1e08f6383f1a160f5366
font_02_sfnt_off000103e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00011bf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF5 18680 bytes
SHA-256: 4d22d08dfc639cf58926abc61e2571944239c6cb48d653fd62c836c34a346dde

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