Malicious PDF — malware analysis report

Static analysis result for SHA-256 39203a0cdfd75fa7…

MALICIOUS

PDF

72.4 KB Created: 2021-09-14 05:27:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7fee058e4a980a6e86a39554af311500 SHA-1: 79d03f24746f79f944d1a6e8bfee39edcc12cc9e SHA-256: 39203a0cdfd75fa763a5683059e56d20d24fc1b5be69e61d6a7f1b53b028f109
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a malicious intent to redirect users. The embedded JavaScript stream, combined with the ClamAV detection of 'Pdf.Phishing.Trojan', strongly suggests this PDF is designed to facilitate phishing or malware delivery. The document body is heavily obfuscated and unreadable, providing no further context.

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://coretry.ru/uplcv?utm_term=is+cannot+a+word PDF link annotation
    • http://aumnat2car.com/ckfinder/core/connector/php/upload/files/sikulugisigolinokefu.pdfIn PDF document text
    • https://gadesign52.com/uploads/files/202109121153059897.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/wiwujanuxazije.pdfIn PDF document text
    • http://kmsenior.org/file/files/senupaxukifo.pdfIn PDF document text
    • http://vipacademy.org/userfiles/file/zepukalisarezuzotogudol.pdfIn PDF document text
    • https://ntc-container.com/upload/files/xidofamibixeni.pdfIn PDF document text
    • http://kerama.altrodesign.eu/ckfinder/userfiles/files/79811132482.pdfIn PDF document text
    • https://oolong-dining-co.com/webroot/editor-uploads/files/98981844297.pdfIn PDF document text
    • http://plenaseguroseprevidencia.com/fotosempresa/files/padim.pdfIn PDF document text
    • http://vinhthuanvietnam.com/upload/files/92487013697.pdfIn PDF document text
    • http://thaisomboonautopart.com/userfiles/files/14562165398.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1613b181880cdc---woriranomitaxufetega.pdfIn PDF document text
    • http://friend5190.xyz/js/ckfinder/userfiles/files/4431174292.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/volepolewasufemoxajusof.pdfIn PDF document text
    • http://alcantara.cz/data/file/bapexoratiresagisaxusu.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/7d7feb0890946ea6c9f96f4ca5758d22/nalikujujilif.pdfIn PDF document text
    • https://ratosatu.com/contents/files/19356865644.pdfIn PDF document text
    • https://bike-accessories.supersites.gr/content/ckfinder/files/61844614769.pdfIn PDF document text
    • http://shanghaiqingchen.com/upload/files/rasurekomepefoda.pdfIn PDF document text
    • http://grupposcorcia.it/userfiles/files/42937944186.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-9-3/20210903031406841675.pdfIn PDF document text
    • http://giaodantanthaison.com/Images_upload/files/60786273878.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/161319c9bec5ef---90299307405.pdfIn PDF document text
    • http://novastal.pl/userfiles/file/92129441891.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_off0000bc3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC3B 16100 bytes
SHA-256: b8deb9157424ecaf4399951f1c222b4909840fb612327b72929bed3bb8f2b738
font_01_sfnt_off0000e53b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE53B 10132 bytes
SHA-256: 8cf6074f52b29cba8bd822da510af0bb4eeed895d7ec87fc3d33b3731e167313
font_02_sfnt_off0000fc15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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