Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca20333f748d946f…

MALICIOUS

PDF

101.9 KB Created: 2021-08-14 05:50:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 7fb55e5c3e5ccb82558c4dec9a8e0009 SHA-1: ea79b15b14285c39c8a802b9d227a40b5dd2f12e SHA-256: ca20333f748d946f3e320a60d5a2f706bf1e776dbad44c05b4bd2a62b67a63fb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. It also features a link farm pointing to multiple external URLs, many hosted on compromised CMS uploads, suggesting an attempt to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://huntic.ru/uplcv?utm_term=age+of+empires+2+conquerors+para+android PDF link annotation
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/u1mnirrm7epj3qul8ocj72hqa1/nujekuz.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/09649655d38712963ee1791ad0adc485/ridis.pdfIn PDF document text
    • http://due.pt/js/ckfinder/userfiles/files/rujakekizisaxamap.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1606d9a9467935---meroferijukakonapevave.pdfIn PDF document text
    • https://www.sibirprokat.ru/ckfinder/userfiles/files/52553825593.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///20210530271_325548493.pdfIn PDF document text
    • http://bkht.vn/userfiles/file/5132371979.pdfIn PDF document text
    • http://xn--80aaaaaikdebj9ccf1ayja1b5a3q.xn--p1ai/ckfinder/userfiles/files/75645925659.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/mewulovox.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f844425f83c---sesimalipuwadofizirufeje.pdfIn PDF document text
    • https://maturana.cl/upload/file/duduzokakor.pdfIn PDF document text
    • http://3asoft.vn/img/files/94168091506.pdfIn PDF document text
    • http://cfh2.com/clients/d/d2/d2a7b52150a7a947468b52e9b7560e3c/File/14773728142.pdfIn PDF document text
    • http://yejida.com/userfiles/file/tivawisiwe.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/10185446227.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607defd17094e---11954222654.pdfIn PDF document text
    • http://deborahbrown.us/clients/860103/File/48259512175.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161135ad2bb8ba---9236990814.pdfIn PDF document text
    • https://nepalonetours.com/userfiles/files/55739314046.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/8kf5v7hbn73l9hrcbp5geio89e/57776696710.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5c0ca49ae4b39c7362a71d37d70ab7ee/5682242452.pdfIn PDF document text
    • https://vkgnassociates.com/dayafter/uploadimages/newsimages/file/benonefokixaxososeji.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/34827809715.pdfIn PDF document text
    • http://ithaca1962.com/clients/41687/File/wimofofavugux.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/33ac309730d7db7e20f607e1c8bc061a/5418216201.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_off00012207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12207 11164 bytes
SHA-256: 48aafdf59940ccf1a6c7816706930caae1673997c08c4ac1f9e8ba182225018e
font_01_sfnt_off00013ba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000153b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153B9 19872 bytes
SHA-256: 46ce958238a412ea382e1768dc63e6448503b752ed49d58ffd235f996b213348