Malicious PDF — malware analysis report

Static analysis result for SHA-256 9020a543ccc86071…

MALICIOUS

PDF

83.3 KB Created: 2021-09-07 15:57:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 18dc1b6398d2ca5ab47bef7ca2da57f5 SHA-1: 68d341df52c7a090337b288198882b5b3b5d81c6 SHA-256: 9020a543ccc860710a4c0d651bd9753565bc9eb724253c71930d1a5c9e0f562a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://smidgel.ru/uplcv?utm_term=ncert+class+10+english+communicative+book+pdf PDF link annotation
    • http://www.contectrade.hu/fckfiles/file/36324913546.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/bc106c008d243cf95ba16c76f2d55ba9/bobolox.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16071b01a3eafe---lesetikenavomafot.pdfIn PDF document text
    • http://edwardlankin.com/clients/86087/File/34762800317.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/a8fd0534edeed15439a4fd9630d55c2f/29609698311.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/59c1c9c802bc56a36b63c86c24cacfea/rogoxegilebuzilekepa.pdfIn PDF document text
    • https://specialgarden.ro/userfiles/file/likizoril.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/eab3farkrn68c0g81fkh4fi9p2/43684079131.pdfIn PDF document text
    • http://whatifitspossible.com/ckfinder/userfiles/files/wibemegav.pdfIn PDF document text
    • http://chromatographvials.com/d/files/xagutisux.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/39610a268f7294d2bb7f79b69d5d7390/dotalewojaxoselibamu.pdfIn PDF document text
    • http://itcck.org/upload/editor/file/8788890687.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/bapiwetodowa.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/13760251141.pdfIn PDF document text
    • http://vector-mebel.ru/uploads/files/34270247959.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/biwiz.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16071c1e009a70---87011572438.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/34959cf6f367f75b6bbb70e2e85b225a/75226842201.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/70bcce4ba6dbb3e01eaeb130442042eb/7806076133.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/84dertvdntcq2vtas9cbif6i05/nutidabalewi.pdfIn PDF document text
    • https://erdenetpost.mn/userfiles/files/98888230879.pdfIn PDF document text
    • http://misterholidaysanprisco.it/userfiles/files/97692636934.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/a7ep1r9bf6qjvlugot6lvavji9/90646239337.pdfIn PDF document text
    • http://marsalanoleggio.it/userfiles/files/39652370462.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/46563896779.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_off0000de1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1D 11616 bytes
SHA-256: 79bdd9530cb693a904041e1e537d541c4aecc0d10e0cef3204380e243c1b075c
font_01_sfnt_off0000f929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF929 17884 bytes
SHA-256: 8485d069cdfee8107b635b72ac6e421548d9e9976ce5c2e13e3a16a364fa959d
font_02_sfnt_off00012760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12760 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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