Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b5f8c072857b510…

MALICIOUS

PDF

69.3 KB Created: 2021-09-06 02:52:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5636dfa4e7ed7190e4e96a645624c3e6 SHA-1: 12b6878a5ac1edba4cd11f50756cd5f30a2e2cdc SHA-256: 8b5f8c072857b5102f6830cd4900dcd2fc3a77613c57662c6ac1f61196b12762
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to redirect users to malicious websites or download further payloads. Several heuristics indicate the PDF is part of a link farm hosted on compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f9cd42d571---14689733899.pdf In PDF document text
    • http://childhood-matters.com/clients/49507/File/xodisak.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a3b7472d19e---72638265307.pdfIn PDF document text
    • http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/kiregemomavigoxibater.pdfIn PDF document text
    • https://nhahangthanghuong.com/uploads/files/74512857124.pdfIn PDF document text
    • https://speculatio.in/ci/userfiles/files/29871435537.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6bdd022e7---lusefumorufibukalinute.pdfIn PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/39885612697.pdfIn PDF document text
    • http://soft-pro.hr/upload/datoteke/tavogemutevapexosazulawi.pdfIn PDF document text
    • http://octapus.vn/images/uploads/files/vafor.pdfIn PDF document text
    • http://accomplishtheimpossible.com/userfiles_ati/file/nojap.pdfIn PDF document text
    • http://ecogestval.com/userfiles/file/mifufovulog.pdfIn PDF document text
    • http://www.srijonihealinghome.com/fckimages/file/36890022929.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c51340e4ad0---5856422009.pdfIn PDF document text
    • https://bataretak.com/img/files/file/41466308202.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b796098b05e---17720295589.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087f2d153759---rinelugeterulejexu.pdfIn PDF document text
    • https://nguyenhungstone.com/uploads/image/files/fikiwelikada.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/75834015390.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/vuwerigonuzajesosufotufis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=verbos+en+pasado+perfecto+en+ingles+pdfPDF link annotation
    • http://zs.tom.ru/jsplugins/ckfinder/userfiles/files/vemafujogesogosewujur.pdfIn PDF document text
    • 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_off0000af1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF1D 10904 bytes
SHA-256: c0f24a9dfe0ac346e154b0936fffc30c9c67b10aff9d1e9ad51d352532597b66
font_01_sfnt_off0000c80a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC80A 15388 bytes
SHA-256: 8ff0e31c7cc148624521b1796f18f75b942c6fb77661bfdc0f21d6a7c297b669
font_02_sfnt_off0000ee3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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