Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a2f543fc0ce53b3…

MALICIOUS

PDF

78.9 KB Created: 2021-09-19 01:42:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 99c9ca6885ef3f5b710b59752d3dfed2 SHA-1: be9751e384c67d38d07f22e4314e3027dd5efc9a SHA-256: 4a2f543fc0ce53b301f2c99677b662437f866052173320c2cba32812d72f09dc
204 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ClamAV as a phishing trojan. Heuristics indicate it contains embedded JavaScript and presents a lure to install browser extensions or updates. This suggests a social engineering attack aimed at compromising the user's system or stealing credentials. The presence of numerous external links, many pointing to compromised WordPress sites or disposable hosting, further supports a malicious intent to redirect users to harmful content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://strandedtattoo.info/file/77918054979.pdf In PDF document text
    • https://www.pharmawell.eu/ckfinder/userfiles/files/21936937164.pdfIn PDF document text
    • https://elger.cz/fckphotos/file/41560722440.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614663786db4f---11602832126.pdfIn PDF document text
    • http://plenerowe.kbo.pl/ckfinder/userfiles/files/voxoxamuposalawemefebuve.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613291ccb35a1---xetulizuzi.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/af9683c9f55da017f76e27a528ccfae2/koseju.pdfIn PDF document text
    • https://oreopay57.com/ckfinder/userfiles/files/82479292777.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/aqs2o6j4jhid9qa9vfq7oaj9bc/nolofanipokasima.pdfIn PDF document text
    • https://ekoelprom.pl/public/images/editor/file/remuroganulijavemodom.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16143533ef2dd3---pelojuwufanugafufovotin.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/dc2e719799404e549b54883a7ba219bf/zifazizorefefezibixo.pdfIn PDF document text
    • http://gerocuki.hu/user/file/80854794044.pdfIn PDF document text
    • http://rs-entp.com/upload/file/94330085263.pdfIn PDF document text
    • http://stsmcc.org/www/js/ckfinder/userfiles/files/9148617948.pdfIn PDF document text
    • http://park-seversk.ru/other/js/ckfinder/userfiles/files/78595739572.pdfIn PDF document text
    • https://www.premiumtrade.ro/ckfinder/userfiles/files/93767824282.pdfIn PDF document text
    • http://panhongbo.com/ckfinder/userfiles/site_eachfun_com/files/wigume.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/83779888773.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/29pf4inqeqem8e2aj7j07vfpi1/20159936446.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/fosoke.pdfIn PDF document text
    • http://recrute.fr/files/files/5400207229.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/tapekabezowanotinux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=things+fall+apart+research+paper+pdfPDF 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_off0000d3ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3AB 16104 bytes
SHA-256: 52057c2ef4f775b1fe5ed4229734dd965968c2d8a07878a1265c4fe222fdb5a5
font_01_sfnt_off0000fd2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2B 10740 bytes
SHA-256: f7ff23bd6d5478a8c35390ef79a574157a3bc3dbe4f1cd5c226c615084276105
font_02_sfnt_off00011590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11590 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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