Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fa663e125f66c30…

MALICIOUS

PDF

98.1 KB Created: 2021-07-01 00:01:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 05041b8bf7ea448c2462b429ae754696 SHA-1: e8704b7b3bc4024f3c758ff6a445bbfc679d73d5 SHA-256: 2fa663e125f66c30ea62b44c2c9073ea139779bcc8bbddc4ec2e7bec46253d63
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many of which point to compromised WordPress sites. These links appear to be part of a link farm designed to host or redirect to malicious content, likely for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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.
  • 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://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/ing1bh15l48l2u7gb8su3fc1ug/fufexipekaturalipapaxezop.pdf In PDF document text
    • https://wildarium.com/ckfinder/userfiles/files/64832211621.pdfIn PDF document text
    • https://red-adlay.com/upload/files/66805150042.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/nivuv.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16094c9c0b4aeb---5615684166.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160d3c0d45b0a4---latutowofibavejet.pdfIn PDF document text
    • http://nhs71.com/clients/d/d9/d9c6bfbc4bbdd207836d30c01fe5869c/File/gixugigibede.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/tneptesoimqq9cm32kd1rf0ikj/taposupudibo.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d499c9bc4e6---jujawuliv.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160dca43d71b9a---jipufegikupavojimilunat.pdfIn PDF document text
    • http://serextion2006.com/js/upload/files/dogogelen.pdfIn PDF document text
    • http://hyperasp.net/userfiles/file/35965466301.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/d2d915218f2f8476ceb013e5e35c4651/zeduxewesifetufaduvutibi.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/181cdeffc65740de54909e37cab3a35a/33992138886.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608c01da3edfc---77736668352.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/96476190570.pdfIn PDF document text
    • http://scheidenschiedam.nl/uploads//file/gategafokisusat.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160ad80c56ee97---11749029158.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160716f7396065---mowegazalizatosi.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c610a35af4a---xisapuzi.pdfIn PDF document text
    • http://jaatkinson.com/userimages/radutize.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d1cce4452---25177805353.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/dazukudifuriwef.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609d57c4a241d---6282112581.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=what+is+the+role+of+decomposition+in+the+ecosystemPDF 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_off00011a8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A8C 17788 bytes
SHA-256: de8f3c9832e375d317847f3a1815ecaf9aea9890a355fe5afd444806adc3860d
font_01_sfnt_off00014965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14965 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001617c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1617C 10992 bytes
SHA-256: e0365a80d0f360c2eecc93b8edbca372c82e69e36185470748425887d72246ef

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