Malicious PDF — malware analysis report

Static analysis result for SHA-256 cad8b55fd4628f09…

MALICIOUS

PDF

97.5 KB Created: 2021-09-11 08:04:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c70bf253e2343db5c3dd97632846040f SHA-1: d0381152338753727cb9c0718be57483e8c75350 SHA-256: cad8b55fd4628f09e667b6f65ff9b0eef82d7d01431a54912210f2bbd4582889
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous URLs, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://lidiyageorgieva.com/ckfinder/userfiles/files/pawebomolapa.pdf In PDF document text
    • https://sanruouvang.net/images/uploaded/file/33980188865.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/25112522711.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/8e6da61c46088e438f9d1eb2a2177f0f/xusokurozojedogozelabogad.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021090823573476.pdfIn PDF document text
    • http://tayles.com/uploaded/39792702192.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613acb1f851f6---bewudedopukuz.pdfIn PDF document text
    • http://langmoon.jp/js/upload/files/xejamesixokarimifepap.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b13434ce74---nugezitesifewir.pdfIn PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/nuxejejokoxomapesaxuteg.pdfIn PDF document text
    • http://tabbanbros.com/admin/fckeditor/editor/filemanager/connectors/upload/file/7560130942.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/ginavezawonidonizaxilusiz.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/e61afc4c7de0b3cc5112b934becb656c/dozubipiwijabexupoz.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/vemovisunubujalot.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/jizawitatijujinetosavo.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/35233873898.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/tiboginawawef.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613746fd33ff8---10102626179.pdfIn PDF document text
    • https://easternresources.net/ckfinder/userfiles/files/34140405674.pdfIn PDF document text
    • http://oshcongregation.com/userfiles/file/28158161418.pdfIn PDF document text
    • http://metafelix.it/userfiles/files/12861924778.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/a5916217a0107796e5751cde04865c55/89253478449.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/23398921506.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=free+skins+among+us+androidPDF 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_off000119ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119EC 10616 bytes
SHA-256: 19d0ce9b4b15f484900020bfb19e4f8bf7b1252723e173fb703b4b31a1308151
font_01_sfnt_off000131ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014a00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A00 18244 bytes
SHA-256: 463f0ba61ed9723d6eb2b56147121dacde754b7651b8ebb3ea293a2074cb4035

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