Malicious PDF — malware analysis report

Static analysis result for SHA-256 a76ecad4218dad23…

MALICIOUS

PDF

83.4 KB Created: 2021-09-04 21:58:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9d14f306466e5a76014c45c0dda0a15c SHA-1: e7e3014dcef8966ee7030e7d27593b9f1c5b45d2 SHA-256: a76ecad4218dad2301e8030bb4fc676ce8947ffdd7f54cfb5eb33a81cfe0c46a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and a link farm pointing to compromised WordPress sites, suggesting an attempt to distribute further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely responsible for executing malicious actions or redirecting the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b977ca30e08---28113829147.pdf In PDF document text
    • http://szsahsh.com/uploads/files/bezizudinebawovewur.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/mitekis.pdfIn PDF document text
    • https://tucarrorentacar.co/ckfinder/userfiles/files/fubulu.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160e079722277d---dolabevezujejafe.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608a8bdeace3d---nagipulidonabazuladopuko.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/67662065340.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/98692692270.pdfIn PDF document text
    • https://namlongadc.vn/uploads/news/files/63853279186.pdfIn PDF document text
    • http://writtenmail.com/upload_images/file/sumukezexiwagabige.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16085d18b6d4d7---17922221774.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/69d67d0cbde513bf2e097176d8373972/navojujinajuxukabuto.pdfIn PDF document text
    • http://v-lukomorie.com/uploader/files/96441814159.pdfIn PDF document text
    • http://faithleader.org/js/ckfinder/userfiles/files/giniwelasawusagekebora.pdfIn PDF document text
    • http://sintellect.ru/Repository/file/33304186041.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/seketif.pdfIn PDF document text
    • https://www.alapan.org/fckimages/file/87017780197.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9fcb3d3785---razexowagopuwi.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/76900836715.pdfIn PDF document text
    • http://gps-tw.com/CKEdit/upload/files/97572865548.pdfIn PDF document text
    • http://katour.ru/admin/ckfinder/userfiles/files/masep.pdfIn PDF document text
    • http://noithattamphuong.com/upload/files/66146309641.pdfIn PDF document text
    • http://quocteanviet.com/img-chamthi/files/99550917851.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7724a0673---najajij.pdfIn PDF document text
    • http://xdata.pl/app/webroot/img/ckf/files/kopolan.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/70020517056.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/28155437961.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=honda+civic+2005+manual+transmission+fluidPDF 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_off0000dfc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC3 17892 bytes
SHA-256: b7a3839c9a6e32b3269fbc69dc18a6457b2c6edcd979040e151f590ea10ff1e8
font_01_sfnt_off00010e21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E21 11040 bytes
SHA-256: ca18e2d6ada3ebacfba655c68d6e1dc83cfdf58c3f77845a491fba99c84b0046
font_02_sfnt_off000127e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1