Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa03ceacbf86ddd7…

MALICIOUS

PDF

81.5 KB Created: 2021-09-10 15:17:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 7ebe5212c72f14f21a8cc06cf40dc8ac SHA-1: 2f80a6fe75bb1dc15b497e6c5db651456bf2ed89 SHA-256: aa03ceacbf86ddd73eaebb4685bee99b21ed8af444686cc9c4c5438e3a998817
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, some pointing to compromised CMS upload storage and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to malicious sites or the download of further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://www.dereformasenalicante.com/archivos/files/16613030719.pdf In PDF document text
    • https://pellevah.com/upload/files/18200282992.pdfIn PDF document text
    • http://inteko-tula.ru/f/file/sinizabopipubilozo.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/zosif.pdfIn PDF document text
    • http://fnathservices.com/upload/file/tisob.pdfIn PDF document text
    • https://luxesystem.site/js/ckfinder/userfiles/files/84405332866.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/pexefuvifatuku.pdfIn PDF document text
    • https://gentrilieu.vn/userfiles/file/39540353941.pdfIn PDF document text
    • http://tahi.hu/ckfinder/userfiles/files/87194887348.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/8f49rsq2u0o1r8snlpj31qpp71/56494300878.pdfIn PDF document text
    • https://gaziemirkentkonseyi.com/upload/files/13270849089.pdfIn PDF document text
    • http://hiro-seiko.com/upload/files/74003549501.pdfIn PDF document text
    • http://cuacuonbinhduong.com/upload/files/85739370293.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/1sg6q4dgjgkte7l95b71s0ok53/sefuvedijijawikiganof.pdfIn PDF document text
    • http://selidbe-beograd.info/files/xemofomusamo.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/161338e035ffe2---wawuvazusoses.pdfIn PDF document text
    • http://niszczeniewaw.pl/userfiles/file/sugiguvusalekukemupud.pdfIn PDF document text
    • http://deforma.it/userfiles/files/55935684709.pdfIn PDF document text
    • https://fallahi-sch.com/userfiles/file/43581777955.pdfIn PDF document text
    • http://climtech.com/files/files/zozonuvotesizepuximem.pdfIn PDF document text
    • http://simsvizag.com/admin/uploadedfiles/file///85507394620.pdfIn PDF document text
    • http://aedjtjdshbf.pretty-match.com/upload/files/mumutoramedifusarekiwa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=haruki+murakami+1q84+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_off0000db84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f39b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39B 10660 bytes
SHA-256: 3eaee3e303df41d8e378e3a8b30a456515699c0536ed2fa3e607bdc6036066f0
font_02_sfnt_off00010bcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BCD 17344 bytes
SHA-256: 2593ec47250b6cbd7b8d88d6acbbc8f8b198e76f9d1c0b74a8675241400b7f9c