Malicious PDF — malware analysis report

Static analysis result for SHA-256 65ac5a79238fd7ee…

MALICIOUS

PDF

78.2 KB Created: 2021-09-08 17:13:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9746aa1ce67b274e19ed7b961f27127a SHA-1: 50bb5689daf0f8d22f5b4255f34838b507db719a SHA-256: 65ac5a79238fd7ee1d8de65ec39318362083129bc8a41a54c75c7f535d2a9ea9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and multiple URLs pointing to compromised WordPress sites, which in turn host other PDF files. This indicates a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613491aec6c43---biruvexexataxubifexop.pdf In PDF document text
    • https://telewebmarketing.com/FCKeditor/file/tiginopufoxiwiriluzonuraf.pdfIn PDF document text
    • http://fatfailogistics.com/fckeditor/files/file/terasa.pdfIn PDF document text
    • https://waelfawzy.com/userfiles/file/In PDF document text
    • https://manusingh.org/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/26323720858.pdfIn PDF document text
    • http://congtrinhnhaviet.vn/upload/files/13158236480.pdfIn PDF document text
    • http://airholic.com/UpFiles/WebEditorFiles/file/31493170260.pdfIn PDF document text
    • http://ajarnveerapong.com/UserFiles/file/nidupuwuxamemipokob.pdfIn PDF document text
    • http://aytekinpolatel.com/image/files/46695550958.pdfIn PDF document text
    • http://rklatex.com/userfiles/file/birogopaxezifu.pdfIn PDF document text
    • http://sjmhospital.org/files/js/ckfinder/userfiles/files/rimitegosixulovexa.pdfIn PDF document text
    • https://tsolisp.com/files/file/marix.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/ef560c052bb8a843e9025ad3d77ab6cc/27094468750.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210906_30717D161B703D15.pdfIn PDF document text
    • http://nachhilfeschule.havonix.com/ckfinder/userfiles/files/zukafebepetedo.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/161327370ba9c9---39619266192.pdfIn PDF document text
    • http://geopraxis.it/userfiles/files/47067005432.pdfIn PDF document text
    • http://clickvay.com/upload/files/juduboweziguzopifi.pdfIn PDF document text
    • http://britishcytology.org.uk/ckfinder/userfiles/files/72082949769.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/107b2abc168167a7e44af030d1132023/80352147481.pdfIn PDF document text
    • https://rodolphe-blanchet.fr/Rodolphe/fckeditor/file/bupasaparoxigege.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/46286601379.pdfIn PDF document text
    • https://kentacademymiango.com/userfiles/file/balovataxojoximepofipo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=mathematical+induction+class+11+ncert+solutions+pdfPDF 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_off0000c93f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC93F 18344 bytes
SHA-256: 49ea2242e483a21940f7c32d5c41b06437f97764c49053d2ea309c4f91faef26
font_01_sfnt_off0000f8e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000110fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110FE 11032 bytes
SHA-256: e850f53450e1bcbabc6fae590fce256664836ea3cc9ddcb2e2288acae8890948

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