Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ef3aabd7945f2e0…

MALICIOUS

PDF

82.6 KB Created: 2021-09-04 04:01:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0841d5a3afc0d2f4571d229d39b06eb6 SHA-1: 36fd84d728fba0253f13f4353fb7c98eabe3754c SHA-256: 5ef3aabd7945f2e076ae81d81531a3f86adc0a22947d1a363126b74aabdb0bde
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised websites, many of which are hosted on disposable domains or use WordPress upload vulnerabilities. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct user-facing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c22a7b0b71f---4166633253.pdf In PDF document text
    • http://bizbecho.com/pa/trainstation/uploads/image/file/movolepiripixonaju.pdfIn PDF document text
    • https://muacash.com/webroot/img/files/39127395556.pdfIn PDF document text
    • https://beatmuellerfoto.ch/userfiles/files/13558266354.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/c8022b0f61495139a48ece9d67e19253/konorewu.pdfIn PDF document text
    • https://nulifeus.com/~nulife/userfiles/file/38883115235.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/rafebodivaloxa.pdfIn PDF document text
    • http://lex-ter.ru/admin/ckfinder/userfiles/files/16683589515.pdfIn PDF document text
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607376aa56d13---70228944651.pdfIn PDF document text
    • http://nnkcreations.com/userfiles/file/47912233448.pdfIn PDF document text
    • http://ansonseatery.com/uploads/files/xikixov.pdfIn PDF document text
    • http://dichvuketoansg.com/luutru/files/13008971759.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ecb268362---14668446118.pdfIn PDF document text
    • https://nicklason.se/ckfinder/userfiles/files/rivigawu.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160aa257f7b0ef---vujukova.pdfIn PDF document text
    • http://mineraux-et-lithotherapie.fr/ckeditor/upload/files/rumanokeveguvupofes.pdfIn PDF document text
    • http://geerhannutpourreussir.be/docs/upload/files/17977696561.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/rmu48p4n02rdf4u3o4u4m46c69/31255722536.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609255c66a65e---76464636580.pdfIn PDF document text
    • http://www.polni.si/Images/files/vurubi.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/42ef8f0b5206cc0c172537ae3e623f24/nejubiwigegitumozuro.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/difutalawuruxelakeguwofif.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/a8dddd50f69d427074f2bd30754745e9/xusuxesuvagolubugatowog.pdfIn PDF document text
    • http://xatrbio.com/userfiles/file/87506959244.pdfIn PDF document text
    • http://bud-drog.pl/userfiles/file/55323942162.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160979c4abded2---fezinomimigigewere.pdfIn PDF document text
    • https://actorconseil.com/files/file/disosanozimiwivazuvi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=play+winning+chess+book+pdfPDF 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_off0000dde9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDE9 11136 bytes
SHA-256: 3319b50611d763eb50ef223cc53d874d741ff5045dbb7a9400140a87ac1aa69d
font_01_sfnt_off0000f775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF775 17404 bytes
SHA-256: 8afec97d2587aaff1f808d23fcce08a3ba0398659f37084ecacd073b6d5d60d5
font_02_sfnt_off00012498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12498 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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