Malicious PDF — malware analysis report

Static analysis result for SHA-256 821269682d0ff6dc…

MALICIOUS

PDF

98.2 KB Created: 2021-07-29 15:58:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: c687fdb02e04d3b142363d36c4769376 SHA-1: 48376cb83a703b163d14c2aac30752fe6fe203a6 SHA-256: 821269682d0ff6dcc3e559df266a97470d99593e0af770d836be1b4573013e6b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to other PDF files hosted on compromised WordPress sites. This behavior is characteristic of a link farm used to distribute phishing content or redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • 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://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/9043876c383ed324b42d3ea751b44321/nixulofutolepovaper.pdf In PDF document text
    • http://supermarketdv.ru/files/file/sulenumevozudaxepijagan.pdfIn PDF document text
    • http://wenxuezj.com/images/File/68924879328.pdfIn PDF document text
    • http://yao-cheng.com/uploadfiles/20210620032545.pdfIn PDF document text
    • http://softtox.com/new/userfiles/file/22909680082.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/6d74ef3ce9735e8b45be02f020896e12/90132301263.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/najamiruwusudunan.pdfIn PDF document text
    • http://wonsakai.com/uploads/files/viselofe.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e97c18a0e---53133279005.pdfIn PDF document text
    • https://gilbertems.com/videos/file/nikofikakenewesilavijotal.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb9d87ebf8e---30945716601.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/lrm925smk23j7r5k29676ikuv6/42947877373.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/74504267857.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160755e7b3630f---30992597124.pdfIn PDF document text
    • http://www.taimaobi.com/admin/ckfinder/userfiles/files/94150785626.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/tavilasufedeba.pdfIn PDF document text
    • http://tischlerei-schlusche.de/sites/default/files/file/rovidejepiledoberigilaxo.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/ad540e2a1665362643b5c88b9650fdaf/nasosujapokobaz.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160cd97c88b1be---22623894257.pdfIn PDF document text
    • http://basumati.com/app/webroot/ckfinder/userfiles/files/94331142917.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=classical+oration+formatPDF 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_off00011cc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000134d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134D9 17304 bytes
SHA-256: 5eecdce795a108582c8b63e83392d7232c834bea2b0e0cccb9ae555d1e71eae4
font_02_sfnt_off00016197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16197 10396 bytes
SHA-256: 06d4395eb212dc768f3b0909d5c4f2dfdf356c84887e3116a6606958753640b1