Malicious PDF — malware analysis report

Static analysis result for SHA-256 923c64f8f8dcaf96…

MALICIOUS

PDF

86.6 KB Created: 2021-09-02 03:46:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a650103514f164f101beb13554d6bc44 SHA-1: c53596a2935005f33525c2f91a0f92fc08619381 SHA-256: 923c64f8f8dcaf96b7d133d8bedc0f2a476bee56c445658c9e0de9dd81f0386b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm directing to multiple compromised CMS upload directories, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure and numerous external links point towards an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • 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.
  • 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://hanmih.com/userfiles/file/20210812180223.pdf In PDF document text
    • http://dtpokebar.com/uploads/files/69773330526.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/4d66a44eb17b2d132701a08188273d9a/75571604867.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/5tvr4e39e9vcp8agu2ovg6qim6/41609785992.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/pjcqg72phcjb4khg27p0f5o2mq/zujafi.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160946d2db3f83---7523219308.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2f94e77a4---57375134276.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/29880494139.pdfIn PDF document text
    • http://abwgulfport.com/uploads/files/62045272752.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef9871ce31---19672179321.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/e270da2ee5169bd27aa9691284338d4b/93924685423.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b9922b6a2e6---fibagojulokitovakefav.pdfIn PDF document text
    • http://herbwaterthailand.com/userfiles/files/37218207229.pdfIn PDF document text
    • http://flagrant-desir.com/userfiles/file/zefanepotenibip.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/80356197330.pdfIn PDF document text
    • http://qualityspices.in/ckuploads/files/40143640849.pdfIn PDF document text
    • https://www.tunnel.de/files/uploaded/file/fonamafegedumini.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/puvaxikujozumirajub.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c15de8559f6---17876818472.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160c06b528e9a3---37603880512.pdfIn PDF document text
    • http://drivingtesttips.ie/fckeditor/userfiles/file/borerosivagatoxumus.pdfIn PDF document text
    • http://tecniagua.es/uploads/ckfinder/files/retufanelewiruligunapid.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/jaduxitokixuni.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/24833271507.pdfIn PDF document text
    • http://philboyd.com/99575066926.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=blackberry+cobbler+with+canned+biscuitsPDF 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_off0000eb6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001037f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1037F 17804 bytes
SHA-256: 18c7252b7c76bd54b4ea3bbb584ee1cfefeec2eb569307c2ebcc9e952b14a917
font_02_sfnt_off000131be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131BE 11052 bytes
SHA-256: 6eb5dd09057513e7d419fead43c3777796ae7be66e26db95f45b0d7d1290000f

Open this report in the interactive analyzer, or submit your own file for analysis.