Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2ed6d7ff1805e11…

MALICIOUS

PDF

70.3 KB Created: 2021-09-27 19:24:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 7a2d78c9282f0f29323507f408ba507c SHA-1: 2cadc5b6e364d144da369c7e102b6f52ff3b8937 SHA-256: f2ed6d7ff1805e11dc556aaa8df8dff2381d1046945fed27094d33f6e9063d92
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external URIs, many pointing to compromised or disposable hosting, suggests the document is designed to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates a link farm on disposable hosting, further supporting a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://medvor.ru/uplcv?utm_term=download+app+movie+free PDF link annotation
    • http://bavlas.lt/ckfinder/userfiles/files/xokotuxiru.pdfIn PDF document text
    • http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/41987547225.pdfIn PDF document text
    • https://groupunsur3.com/contents/files/winuwifavorur.pdfIn PDF document text
    • http://maskaevlawyer.ru/userfiles/file/15352388121.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/03e9c115c710adfe106417f37e3b368c/42659864472.pdfIn PDF document text
    • http://infosierra.es/images/editor/sipofopewididukix.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/09/file/98127362753.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/40bdf293cdb2ebf2cff06851919f344d/nifagutadibiba.pdfIn PDF document text
    • http://dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/paxukodorim.pdfIn PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/14234291411.pdfIn PDF document text
    • http://hejia-ele.net/upload/3050088076.pdfIn PDF document text
    • http://vlaamspatientenplatform.be/_plugin/ckfinder/userfiles/files/wapufukagewebuvovo.pdfIn PDF document text
    • http://bigbulkbags.ahmadpackages.com/survey/userfiles/files/wexidi.pdfIn PDF document text
    • http://redactron.com/userfiles/file/63357554954.pdfIn PDF document text
    • http://stonebreaker.at/64610340887.pdfIn PDF document text
    • http://pho32shabu.com/uploads/files/29451414077.pdfIn PDF document text
    • http://kxxbs.com/uploadfiles/file/a/venabulugifu.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/3db287462914cfbb245a50b37d1f8f50/7726180876.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613a702a2da97---41711663430.pdfIn PDF document text
    • http://qataminational.com/uploaded_files/userfiles/files/35184600063.pdfIn PDF document text
    • http://manu-transport.com/documents/file/fuketitabekubejigulid.pdfIn PDF document text
    • https://iwanbim.iwan.co/userfiles/files/romutetarozefigetuxelupo.pdfIn PDF document text
    • http://stsmcc.org/www/js/ckfinder/userfiles/files/31607207004.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_off0000b1f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1F9 10548 bytes
SHA-256: 7cc62ee7dc33397c85b3c884d31a05785fea456d58962b709281d9689ad10258
font_01_sfnt_off0000c9ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9ED 16472 bytes
SHA-256: a7d2c403fc53d7a8bfec760eda489e0ca43f51d628f6e2d909fe203dbf573e5d
font_02_sfnt_off0000f3a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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