Malicious PDF — malware analysis report

Static analysis result for SHA-256 7935f04d0324e540…

MALICIOUS

PDF

89.9 KB Created: 2021-09-02 02:13:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8306f70d0e232403efb3d570d44f1b44 SHA-1: 936a060987ca51b189c949873640ad26fdf2767f SHA-256: 7935f04d0324e540909d1bd5ad1db5a7320ff23bb84490093025a542c52fa1b4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious document, possibly leveraging embedded JavaScript for redirection or exploitation.

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://muzeumostrowiec.pl/obrazy/file/74630590415.pdf In PDF document text
    • http://stavebnevyrobky.sk/www/upload/files/mupekevoganapugo.pdfIn PDF document text
    • https://oykufestivali.com/ckfinder/userfiles/files/varoro.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/59f63d7df0baa8f975dad734364bff56/kojujigevadewa.pdfIn PDF document text
    • http://chothuexehochiminh.com/userfiles/file/62599356094.pdfIn PDF document text
    • https://stopserv.ru/files/file/96951802714.pdfIn PDF document text
    • http://louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/46013104341.pdfIn PDF document text
    • http://izeninfo.net/admin/upload/files/93009239648.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/trt9psjmmu7qv5dcfig6rntpnn/4912832265.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/10911537449.pdfIn PDF document text
    • http://packagingandfoodmachinary.com/userfiles/file/kiroponifakus.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf5404e0ac---tidiwobapapodupu.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/sclneab2e2hul2fijaen7rhn7s/57258657978.pdfIn PDF document text
    • http://protok.pro/upload/files/gikevexanilobubofum.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/8b85966126410b06e6eb359d6d308b8e/91392442704.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/40b73d9de1b2964ff429cc5ba6cacf8a/91495184450.pdfIn PDF document text
    • http://szintai.hu/ckfinder/userfiles/files/lafosezuri.pdfIn PDF document text
    • http://danies.ru/ckfinder/userfiles/files/wovejilofe.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093ceaa21e70---98229031587.pdfIn PDF document text
    • http://lulanjina.net/upload/files/52305498487.pdfIn PDF document text
    • http://hoangnampte.vn/quangbasanpham/app/webroot/upload/image/files/zerudetolowozogirewis.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/11360983407.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad40dc1894---89885132309.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=new+movie+download+in+isaiminiPDF 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_off0000f8f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F1 18600 bytes
SHA-256: d667c3fe04e87214e16960218b1b8c29cb1171d991902dd74213bc73ed16e642
font_01_sfnt_off00012970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12970 10340 bytes
SHA-256: ad609bc92513014cc8cd368fbef97a98b0b2c9620f52be60ea42421d8dda462e
font_02_sfnt_off000140c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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