Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7573dcdbfbfa27d…

MALICIOUS

PDF

88.7 KB Created: 2021-08-14 08:50:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 70fac322a9aed82b898de7a8e5695f63 SHA-1: 84398936cb916b22f94906e61f680bab67d504a8 SHA-256: c7573dcdbfbfa27d241824f7f684c46c3efb90ff0c1d00c8b42cc2f77490f8f4
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to multiple disposable hosting sites, suggesting an attempt to deliver a malicious payload or phish the user. The presence of a 'Password-protected archive handoff' heuristic indicates a common tactic to bypass security gateways by instructing the user to open a password-protected file, which likely contains the actual malware. The ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://auto-rujo.com/images-editor/file/roxekipawegunozuxobif.pdf In PDF document text
    • https://samavetpharm.com/userfiles/files/mababoz.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/164a7874dda0095ed36210c1bdae3e73/22203994335.pdfIn PDF document text
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/gikavojut.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/g17a1grgmudk1vq3qsou38s042/gijewikiwiveguko.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/fevokuporalekeloxoli.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/ae5507a059fbfa2e6e528348455c6591/rixovurivujaxir.pdfIn PDF document text
    • http://mariondhuique-mayer.com/data/file/72531798629.pdfIn PDF document text
    • http://zlato-stribro-investice.com/upload/files/pawelamirisaveladumigud.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4b1e3a162---norasurerojilotafimi.pdfIn PDF document text
    • http://tsrmmessina.it/userfiles/files/53840992023.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1683c1427---livaxunadosinake.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a106c9ddf33---2609522786.pdfIn PDF document text
    • https://ekaplast.site/admin/ckfinder/userfiles/files/wesasubojonopotujofibav.pdfIn PDF document text
    • https://srmhomes.com/images/bulk_images/files/sikin.pdfIn PDF document text
    • https://nbtele.com/en/cache/fck_files/file/sokojiw.pdfIn PDF document text
    • https://prokoncept.hu/admin/blogfck/image/file/poperogujuze.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/nabofebugibax.pdfIn PDF document text
    • https://ncsccalgary.com/userfiles/files/76829327376.pdfIn PDF document text
    • http://temple.mo/userfiles/file/90701909902.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160700b8ae0524---gurubunuwuvonofego.pdfIn PDF document text
    • http://mail-ex.net/userfiles/file/68435577821.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085ecf40ec30---kazomevenuwuxuxi.pdfIn PDF document text
    • https://andana.us/files/files/81510763486.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/jotowopitowizedogibirex.pdfIn PDF document text
    • http://bjeclinic.com/ckfinder/userfiles/files/wezuviduwokojusilefisemo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=construir+arvore+genealogica+excelPDF 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_off0000f2e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E5 10704 bytes
SHA-256: 87bc37ebe27f71aa14c757413f56c8b8ef9e364070695fac0adf01dc48c81522
font_01_sfnt_off00010bad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BAD 18976 bytes
SHA-256: adb5d94c99db6c2bad4b18510b0195336a1e9ca4d3f7364b5647b8803338b300
font_02_sfnt_off00013a46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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