Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ab5a3737e067ad6…

MALICIOUS

PDF

79.0 KB Created: 2021-09-06 17:57:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e1f422320fc0c5b5cbc6a0f8464445eb SHA-1: d0b931d11dfdda12ea5dd18bee9c33245423bae4 SHA-256: 9ab5a3737e067ad64fd2c5cedff26b334e34869ee7c29775e48f1aaf1332de89
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6a24d8f66b---jebubelifinu.pdf In PDF document text
    • http://www.casasemio.com.br/ckfinder/userfiles/files/46531619340.pdfIn PDF document text
    • http://mariondhuique-mayer.com/data/file/33296847857.pdfIn PDF document text
    • https://solucionaesp.com/ckfinder/userfiles/files/mazotitotoleluxa.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/79106788389.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/jeximikologuduvovuxulo.pdfIn PDF document text
    • https://anna-bel.com/app/webroot/files/userfiles/files/pozajezokibonuranig.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/fubazilusunemixubonev.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/sugabixisagepuxusifefese.pdfIn PDF document text
    • http://zezoalza.com/ckupload/files/bafera.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba1a3ed9e05---gapifararonozapek.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4531ab265---pebolinugaxogof.pdfIn PDF document text
    • http://aedelsur.com/contenido/files/12016694586.pdfIn PDF document text
    • http://liveranigioielli.it/userfiles/files/lujafudeditas.pdfIn PDF document text
    • http://finalstage.biz/js/upload/files/60940833506.pdfIn PDF document text
    • http://lesen-und-schenken.de/userfiles/files/72003798044.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/smt0pr12v0bh1rs4cfl3pdjqib/68803525995.pdfIn PDF document text
    • http://ccsup.co.th/uploads/ckfinder/files/42348757991.pdfIn PDF document text
    • https://lawrenceyezersky.com/userfiles/file/jebifafexusafasado.pdfIn PDF document text
    • https://ibeguiristain.com/userfiles/files/1417841096.pdfIn PDF document text
    • http://ecole.ru/text/images/file/xasedokupusameferobakeko.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/ukkblfbca3l20lahoam0lg28s2/49186111364.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1237875919---juwemeni.pdfIn PDF document text
    • https://mandarinusa.com/userfiles/file/1627295280.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=self+awareness+essay+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_off0000d4de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF5 10456 bytes
SHA-256: 6792d23dcc93902a30e8be86ff7130f9de315f4e025cb5dc681d48ea436f7e4d
font_02_sfnt_off000104e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E2 16492 bytes
SHA-256: 4e74d330c782c63a7bd057480c8efec1af4ab4e9901de08726d73f269cad9347

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