Malicious PDF — malware analysis report

Static analysis result for SHA-256 72940e57b1b76589…

MALICIOUS

PDF

81.9 KB Created: 2021-09-06 09:36:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 6d632e406ac6920a29b1c61a9047f307 SHA-1: a5b0cf7020a1dbc2aa1c00f7c738dc4b73641f9e SHA-256: 72940e57b1b76589b0fd70226a7399abb0695838ce2e8974634b7c66134f23aa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm hosted on disposable domains, a common tactic for phishing and malware distribution. The heuristic firings indicate the presence of external URIs and a link farm pointing to compromised CMS uploads, suggesting an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://artpolinakuzina.ru/pict/file/niwesobe.pdf In PDF document text
    • http://krishikhabar.net/assets/ckfinder/core/connector/php/uploads/files/tewatijirifexade.pdfIn PDF document text
    • http://cbestdesign.com/ckfinder/images_store/files/xipuwunixexaganupesab.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/b431b2b8518cc18351ec24854268122c/xepofona.pdfIn PDF document text
    • http://www.kindytennis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc1337c8dff---dipije.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/35494308577.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d6fb36ca9---94634552818.pdfIn PDF document text
    • http://protok.pro/upload/files/viridijezowogabalep.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/jubkg52gtvshv8grvq0dc94qs7/gujuzuforet.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160809628e7f73---49370912091.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/buxokekefewadajof.pdfIn PDF document text
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/300349593322.pdfIn PDF document text
    • http://waterreducer.cn/d/files/83154598351.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/c401986108b8deefd1138be811cb4a74/rawakisobeka.pdfIn PDF document text
    • http://curtisfamilyfun.net/clients/e/e0/e02f67ab5b6879a7eb6c21a3163f7106/File/83313575306.pdfIn PDF document text
    • http://sprostredkovanieuverov.sk/res/file/96149695146.pdfIn PDF document text
    • https://traiteur-troyes-mariage-buffet-aube-10.blaisot-traiteur.fr/ckfinder/userfiles/files/zudolefegofurudonuwotipom.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/656b8b64bc6fe83a9d77615fc527942e/5652327116.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/makobuxawivokasudinu.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611327face8a1---14980580915.pdfIn PDF document text
    • http://tourgrodno.by/images/content/file/64677252559.pdfIn PDF document text
    • http://lg-palette.com/upload/files/gowasizusiru.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160895c12ac69e---2239679562.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/b3b2d082086359c21faa1f8ab8d7ff80/vikifizolejusizazu.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/95546200698.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=aptitude+test+download+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_off0000dc4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF464 10560 bytes
SHA-256: a43774e5493779c5b36aaa32f5dc7e193f8a0aeff4f2a76ed1f6106a582e7146
font_02_sfnt_off00010cb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB0 17368 bytes
SHA-256: 38c6e7d2500abc53782aa34fb1887a80fea4997dd9bbba90f109ff9625e66642