Malicious PDF — malware analysis report

Static analysis result for SHA-256 879e40be1c103194…

MALICIOUS

PDF

80.4 KB Created: 2021-09-13 18:46:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: aa35139aad450f47ad2825e88a06aca6 SHA-1: 259add5931c2dd7db3ecedfe6af54180b77516ca SHA-256: 879e40be1c103194f219482b1cf11d8ba581ffcf053fb4e483cf492a1e835516
196 Risk Score

Malware Insights

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

This PDF document employs a social-engineering tactic by presenting a lure to install a browser extension or update, a common method for credential theft or malware installation. The ML classifier strongly flagged this PDF as malicious, and ClamAV detected it as a phishing trojan. While no scripts were directly extracted, the document's structure and embedded URLs suggest it is designed to redirect users to malicious sites, potentially for further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • 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://szsahsh.com/uploads/files/87427400055.pdf In PDF document text
    • https://duhocblueocean.vn/ckfinder/userfiles/files/lixawez.pdfIn PDF document text
    • https://ensegun2.com/ckfinder/userfiles/files/55233739763.pdfIn PDF document text
    • http://espwireless.net/uploads/file/35821749116.pdfIn PDF document text
    • http://levakov132.ru/userfiles/file/kowipanenifagadibenezukit.pdfIn PDF document text
    • http://hyunbulsa.org/~ewedd2/userfiles/file/88819502081.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/89995194461.pdfIn PDF document text
    • http://starfishdowney.com/uploads/files/82551718896.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/4bfcb426aadd1752519308ac1f457138/derin.pdfIn PDF document text
    • http://xedaphcm.com/luutru/files/regopideguvaxipakapusim.pdfIn PDF document text
    • http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/ruzunafil.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613df7fa70f28---tupogakekekogoxu.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021090615143488.pdfIn PDF document text
    • https://sistemagestiondpr.com/userfiles/file/27189657649.pdfIn PDF document text
    • https://hse.tw/upload/file/68777843281.pdfIn PDF document text
    • https://ceccarmaramures.ro/userfiles/file/22228889296.pdfIn PDF document text
    • http://sungwoo-n.com/userfiles/file/41535357551.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/45340c310c8425fb84afbf45e58b7e00/43984475577.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d18b61bae5---61609204130.pdfIn PDF document text
    • http://www.village-gaulois.org/gestion/ckfinder/userfiles/files/pakivifigijadonozojexegom.pdfIn PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/zijidotobojudomotuk.pdfIn PDF document text
    • https://melz-feu.ru/upload/zalewitakikabibifibugu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=grid+layout+chrome+androidPDF link annotation
    • http://louisiana-arts.org.s150269.gridserver.com/siteuploads/editorimg/file/pusokubaji.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_off0000d6d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE9 10720 bytes
SHA-256: a5b4b9f1b16cbadc4876055459d6313ed6c90bb53d6fce8758c54e87e714d1ce
font_02_sfnt_off0001075a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1075A 17572 bytes
SHA-256: 4e1eab4f57ca609790afbb75ec3f2362d240b079babb31ea3b2415c199790be7

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