Malicious PDF — malware analysis report

Static analysis result for SHA-256 feb3fe099231a68b…

MALICIOUS

PDF

80.0 KB Created: 2021-09-12 06:28:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3a68419e30ac3c17a0782c5e02c57ff5 SHA-1: 89854d9548af41d17778122cae288f9de84c57b5 SHA-256: feb3fe099231a68b4e8d9f4bdded5f46a8273622f7bbfdfebff41c6356a8a88a
204 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. The 'SE_BROWSER_INSTALL_LURE' heuristic suggests the document's content is designed to trick users into installing malicious browser extensions or updates. Embedded JavaScript streams and external URIs pointing to potentially compromised or disposable hosting further support this, indicating the document likely serves as a lure to download and execute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://khambenhxahoi115.com/images/files/jogavat.pdf In PDF document text
    • http://www.hgekc.com/media/userfiles/file/10838931079.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/katoliganobabosizib.pdfIn PDF document text
    • http://pantanalmsnews.com.br/ckfinder/userfiles/files/15698110601.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/47dfa296cdbf93e7989f6a3d9ff772ad/47027899170.pdfIn PDF document text
    • http://mfcpavpos.ru/file/59073507457.pdfIn PDF document text
    • http://sprinter-lab.ru/content/File/76548077380.pdfIn PDF document text
    • https://cobrawire.com/userfiles/files/lozofubulizuw.pdfIn PDF document text
    • http://fruitvita.com/files/files/49631313845.pdfIn PDF document text
    • http://swissies.lt/ckfinder/userfiles/files/79181992688.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/xunosazumanizazipazu.pdfIn PDF document text
    • https://imahima.xyz/js/ckfinder/userfiles/files/kekodalurubovafofirebid.pdfIn PDF document text
    • https://tramtron.vn/uploads/files/files/19541141076.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/161323e950e4ae---36192043672.pdfIn PDF document text
    • http://studiotecnicofrisoli.com/userfiles/files/63088888059.pdfIn PDF document text
    • http://liqaa-lb.com/files/userfiles/files/jisubu.pdfIn PDF document text
    • https://polresseluma.com/assets/ckfinder/core/connector/php/uploads/files/98063065113.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613553dcc7f97---99586761330.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/pusuxesod.pdfIn PDF document text
    • http://355353.ru/userfiles/file/dibejova.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210907_110356.pdfIn PDF document text
    • http://donovaly-ubytovanie-safran.sk/web/userfiles/file/gelagunemuwukemidegifulug.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/wezaburezurugat.pdfIn PDF document text
    • https://basisangka.com/contents/files/21020481581.pdfIn PDF document text
    • http://4998horo.gmmwireless.com/contents/files/49666525815.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=edit+this+cookie+chrome+web+storePDF 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_off0000d374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD374 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB86 17720 bytes
SHA-256: 398860d939f4186e1b07dbb0ec3d809f521b168d1e8ba2d35afd297cae928cea
font_02_sfnt_off000119fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119FA 10624 bytes
SHA-256: abfd6f7a809d365916a28829c7bdd9d6fe647a31375293269ffbac15bc1810d5

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