Malicious PDF — malware analysis report

Static analysis result for SHA-256 d99630aa6c5731a0…

MALICIOUS

PDF

88.8 KB Created: 2021-10-07 09:10:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7b4573e6b48a2a9097a52226518f6aad SHA-1: 190b9d1f6edd79236cfa82bd7f84db7baf7282d5 SHA-256: d99630aa6c5731a0782b96e6bc9cd31e0565ebfc415210c3b2dcfd2c1c2d3d35
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, which is a common technique for delivering malicious payloads or redirecting users to phishing sites. The heuristic 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate that the PDF is designed to leverage compromised websites and disposable hosting for hosting malicious content. The embedded JavaScript likely facilitates the download and execution of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://gfwofficial.com/ck_imgs/files/vurilewiri.pdf In PDF document text
    • http://conganbacgiang.vn/app/webroot/uploads/files/3766448304.pdfIn PDF document text
    • https://www.l-games.jp/js/ckfinder/userfiles/files/84553779712.pdfIn PDF document text
    • http://villacappuccina.com/userfiles/files/kipikexarorika.pdfIn PDF document text
    • https://mimpishio1bet.net/contents/files/penobixokaj.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/10c8e03cdef73374eaa36e79e998fe6e/bewanugelu.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/9ad0q4u0dfta7uv953juskle9g/ravogoxobitane.pdfIn PDF document text
    • https://novsport.com/content/File/65065704529.pdfIn PDF document text
    • http://morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e902c408a0---39453973104.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/wezifemarege.pdfIn PDF document text
    • http://soeurs-scjboran.fr/soeurs/upload/files/5602041911.pdfIn PDF document text
    • http://hardiebase.com/uploads/assets/filefile/melalosudepatizinedo.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/f13290a4bbda84e67d38cb53444e312d/rejatibofonarez.pdfIn PDF document text
    • https://client-sms.com/ckfinder/userfiles/files/71794020697.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/161583f2f31b25---vekigom.pdfIn PDF document text
    • http://garant-fond.ru/ckeditor/ckfinder/userfiles/Images/files/mefevim.pdfIn PDF document text
    • http://www.slappedtogether.com/editoruploadfiles/file/vadex.pdfIn PDF document text
    • http://bctlorraine.org/userfiles/file/wupevelibemogu.pdfIn PDF document text
    • http://vegman-kzn.com/ckfinder/userfiles/files/laruk.pdfIn PDF document text
    • http://romanasulcikova.cz/userfiles/4769116910.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/161475eec98e53---kogigelowiguzunol.pdfIn PDF document text
    • http://weorderfood.com/uploads/files/soxodelidinuxo.pdfIn PDF document text
    • http://doubles301.jp/files/ckeditor/files/jebulaxumopabarafe.pdfIn PDF document text
    • https://kratky.eu/files/file/daxinitega.pdfIn PDF document text
    • https://supportsystemsvainc.com/home/ssvi/public_html/ckfinder/userfiles/files/97217529885.pdfIn PDF document text
    • http://drumlockingclamp.com/FCK_Editor_Images/files/jovukizutu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=emoji+quiz+for+kids+with+answersPDF 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_off0000f288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF288 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A9F 11168 bytes
SHA-256: a3eec3bb87206a834a9ef9485e1b72961cd6b1059bf5ac8c888c4ff485886177
font_02_sfnt_off0001245d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1245D 19060 bytes
SHA-256: 1092d4b3f32406f67e26156bb8aaca7086638fab7bbb287e090d402ce7909ba3