Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f0610db12f444b3…

MALICIOUS

PDF

77.7 KB Created: 2021-09-12 00:24:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 29ee65e81b23ef515f0df05a8b03c6e7 SHA-1: 09c3a5c9ccba4d765a525234194452ec5f4f55a6 SHA-256: 9f0610db12f444b30dd16bb67a38b6d54186b8bfce94714e87873889d219b194
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is often used to exploit PDF reader vulnerabilities or redirect users to malicious sites. The presence of multiple links to various domains, some of which appear to be compromised upload storage, indicates a link farm designed to distribute or host malicious content. The embedded JavaScript and link farm structure strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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://tc-antey.ru/uploads/files/pitamasit.pdf In PDF document text
    • http://ronaldtan.nl/images/photo/gunotupuwereguduves.pdfIn PDF document text
    • http://k12kos.com/ckfinder/userfiles/files/10696840160.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/161386ab39f700---65134765877.pdfIn PDF document text
    • http://eichler-kammerer.de/wixozogovawixijezu.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/renexopez.pdfIn PDF document text
    • http://bayanairag.com/uploads/userfiles/files/52082538721.pdfIn PDF document text
    • http://dominopark.pl/public/upload/ckfinder/userfiles/files/xegesitimujifolonipiteza.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0d71a44f1---pipileberub.pdfIn PDF document text
    • http://palazzodiaz.com/userfiles/files/tasativevegomowa.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/sevedadesisotinuwurugokir.pdfIn PDF document text
    • https://gruntbudowa.pl/files/file/vexemurotagijagewemutela.pdfIn PDF document text
    • http://sun-marche.com/app/webroot/js/ckfinder/userfiles/files/pamesip.pdfIn PDF document text
    • https://myclubowners.com/userfiles/files/31133168467.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613138d9160a7---jopiwefiweripupaxutiv.pdfIn PDF document text
    • http://dsagco.com/Upload/file/nuxasikifelix.pdfIn PDF document text
    • http://jumpinfit.it/userfiles/files/mixigodo.pdfIn PDF document text
    • http://promenade-perpignan.com/userfiles/file/18850386231.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/nafoxojavolabotowat.pdfIn PDF document text
    • http://snbedu.com/uploadfile/file///2021091100174146.pdfIn PDF document text
    • https://manorhair.com/uploads/files/202109022019559855.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/8c6b26d985c681949a440f5e95a84bdf/fanoturimizokitiwu.pdfIn PDF document text
    • http://aotwresort.info/ckfinder/userfiles/files/30967270135.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/79997921970.pdfIn PDF document text
    • http://j1ent.com/userfiles/file/20210912062240.pdfIn PDF document text
    • http://jaluzipro.ru/public/userfiles/file/kasabivikituxegom.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/83224721898.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=taxi+driver+ep+8+eng+subPDF 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_off0000cd87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD87 16400 bytes
SHA-256: e43ebde47a83c7052e8590e7ae4b7930e3daee6e2d9bd6294e8b1bd63f9f7be6
font_01_sfnt_off0000f80a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11021 10880 bytes
SHA-256: 0e2cc5067e98838a9a77704f56a1650013093e9a45a682c2a08ea5d58cf38c01

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