Malicious PDF — malware analysis report

Static analysis result for SHA-256 c71535fbbdfa700a…

MALICIOUS

PDF

72.6 KB Created: 2021-07-12 17:22:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 41798719a61532a387e76e18b1fdf2b6 SHA-1: f567876bcd709c015d7a685f96e22c39ce2759fc SHA-256: c71535fbbdfa700a987a8555fa7e865e670b68aa7a858fd62bdf4f966df2eda9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various websites, many of which appear to be compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to lure users to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://chcial.ru/uplcv?utm_term=the+palgrave+handbook+of+critical+social+psychology PDF link annotation
    • http://cachnhietcacham.vn/Images_upload/files/bovezefubonofapumuxexexos.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/7595265f68aafddbba48045b237a3f98/23355832271.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e036e10b083---nuzogumopagevuzaxisa.pdfIn PDF document text
    • http://taniaandjohn.com/clients/874109/File/rujuzofomiz.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/ae1ccba552022673e5b8dc710457036a/mumoximiwodijabepod.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/8ab2d14df7f65069ab0f9f94ace5f105/juresaselisufabitareduneg.pdfIn PDF document text
    • https://www.finestkindcharter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1aa5c87d7---rekosupozomivoriwagi.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/fuwitox.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160ac20d8b67de---tizadofemeb.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/cmjifq98435ts0hm40ji623fn1/solidemanatofubo.pdfIn PDF document text
    • https://apinero.com/wp-content/plugins/formcraft/file-upload/server/content/files/160718e51b141d---75319038511.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e49c0192caf---46232695761.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/eusi5p5ms1d3kpif3uptskp41k/mulojitumutezoxuxipasar.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086c9b17f7a8---11036161186.pdfIn PDF document text
    • https://langumeistras.lt/i/File/tinaralasomupefezev.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/jagadaritewe.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/160705c9e83801---rifesoma.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160bd709dee04f---24407748326.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160842371f011f---zuworugalegakomowob.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/901cbdc39c09ce3d27bc1ba6fb879d3b/kemenixiguxapipoxale.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/8a616a087dffc5dcf4a78f5468efccb6/69324015480.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_off0000bacd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBACD 15640 bytes
SHA-256: ea6d7f65727109d9e21434dd4fb810f527887d47e963e8226248482aee5bbacb
font_01_sfnt_off0000e2fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2FC 11276 bytes
SHA-256: dfcb1455657c8665a8f8cc70228eee2632a610e51708fa7411d3981b3c54509c
font_02_sfnt_off0000fd05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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