Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5391e903a562e6d…

MALICIOUS

PDF

83.3 KB Created: 2021-09-20 08:52:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: edd238ab5f8ea0571cd5c9ee5760601c SHA-1: f71c38f8bdb8aca0491c4845e4583615f2eacfc5 SHA-256: f5391e903a562e6d6dd28cb674177aaca56bea89e1b5af7636ff471569199dc1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to compromised CMS uploads. The embedded JavaScript likely facilitates the redirection to external URLs, which are part of a link farm designed to obscure the ultimate destination. These URLs are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/161343ea515f56---vunanezamesilow.pdf In PDF document text
    • https://www.wroclawmodelshow.pl/ckfinder/userfiles/files/29662054813.pdfIn PDF document text
    • http://miet-boot.ch/images/uploadedimages/file/17122615685.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/xegegixolelijugi.pdfIn PDF document text
    • http://newbusan.net/FileData/ckfinder/files/20210908_A5D7C5189225DB2E.pdfIn PDF document text
    • https://macroedunet.com/userfiles/file/53971759859.pdfIn PDF document text
    • http://csc-021.com/userfiles/file/20210910152430_pjyj8g.pdfIn PDF document text
    • https://xn--90aoja6ahg5ds.xn--p1ai/uploads/files/zuwotikorurodimalenaled.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/62786349221.pdfIn PDF document text
    • http://affordableadobe.com/ckfinder/userfiles/files/4292347932.pdfIn PDF document text
    • http://royalleasingny.com/admin/images/file/lekekisuzelefide.pdfIn PDF document text
    • http://ladyvenus.it/userfiles/files/53230398736.pdfIn PDF document text
    • http://taiwan-tsai.com/upload/files/88586906722.pdfIn PDF document text
    • https://tvmreza.tv/ckfinder/userfiles/files/fojosadel.pdfIn PDF document text
    • http://www.ezmoving.com/file/zetuwukujelisirexakaxited.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614451c05d5fb---30588274804.pdfIn PDF document text
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/68957978671.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613d28c851279---60117359062.pdfIn PDF document text
    • http://findmecakes.com/userfiles/files/77538759098.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/japijetafamudoto.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/22829325418.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/15961006568.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=the+love+of+a+good+woman+by+alice+munro+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_off0000df35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f74c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF74C 11272 bytes
SHA-256: cfc8c63970b62c0cf3fa3fa421b5e6ceb71e1d3ddf29667e9a5b98cb55a3feb2
font_02_sfnt_off0001112b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1112B 18196 bytes
SHA-256: 2f4b055250666e7f5ca3f81c271258d3d26d4975adb60198f9cfd5bb90698b2c

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