Malicious PDF — malware analysis report

Static analysis result for SHA-256 d061de4fdda1764b…

MALICIOUS

PDF

80.9 KB Created: 2021-08-09 13:04:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: dd2bb1fa5bfacab6d9f415056f329f3d SHA-1: 3e4f805441d77b9995a78735c2c046cd113c4fa1 SHA-256: d061de4fdda1764b4bb2c74e3c71975fbe483ee5b37b6788818ca4abe04a114c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, with high confidence. It contains a link farm pointing to multiple compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a deliberate effort to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://www.nuyew.academy/wp-content/plugins/super-forms/uploads/php/files/b2eeb2ea556cbf92a052e9719900fd36/32320399178.pdf In PDF document text
    • https://tootooair.com/FileData/ckfinder/files/20210622_D5B44F22259B84F3.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160737f23813b7---58452753201.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/mvnlsoe4d5otgrut7ccdretj57/mabizokeredotadunupok.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/zenosegegalotuvabo.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/j9fjl61l3frsl98okik14784dh/resodigeg.pdfIn PDF document text
    • https://jxloanchien.com/style/postimage/file/bipibigatexozesigasi.pdfIn PDF document text
    • http://cerezolorente.com/files/cerezolorente/_repo/file/2822638626.pdfIn PDF document text
    • http://www.derbysignandgraphics.com/uploads/file/marakoximozon.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/funosa.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a39c1cc1c9f---42882015688.pdfIn PDF document text
    • http://ssaisarang.com/ckfinder/userfiles/files/tavetugamokozametomosa.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/57555078560.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/lm7kr7cs40r1dm95k1qpmgt1vc/15147129890.pdfIn PDF document text
    • http://www.alcera.ca/userfiles/file/bexijoxuderas.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/tevinibodabedajepoboxiraw.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/xobudafexavuvimemimusi.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081c637c88bd---tixopuwux.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e620259f00f---vatusaz.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/16082e4ee5289f---24991538124.pdfIn PDF document text
    • http://universalgroupautos.com/files/others/wetolamuvozejasebuzaxoz.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/zowipebukupunabiwupimi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=fill+in+the+missing+number+calculatorPDF 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_off0000d770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD770 17208 bytes
SHA-256: 981fc7b38412671c42392eb662871a51533127e22855fca3ff14cf3454a0d09a
font_01_sfnt_off00010481.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10481 10896 bytes
SHA-256: fc7f0da22674766f83a160e51fb473c76741e124d261951ea90b42b5d5ec3ec6
font_02_sfnt_off00011d77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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