Malicious PDF — malware analysis report

Static analysis result for SHA-256 d758c67c0fd9bbd8…

MALICIOUS

PDF

84.6 KB Created: 2021-09-09 06:55:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4f13aad87ec9b7427452eed5f99e58f0 SHA-1: 7d4bfee2e58af4ba24a9548d3d7615de08fe2d70 SHA-256: d758c67c0fd9bbd870fc8c05aaae7e9b30249df7ba495f448868a2109206b4e3
104 Risk Score

Malware Insights

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

This PDF contains embedded JavaScript and a link farm pointing to multiple PDF files hosted on compromised WordPress sites and disposable domains. The ML classifier strongly indicates maliciousness. The embedded JavaScript likely serves to exploit vulnerabilities or download further payloads, contributing to the overall malicious intent of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 6

  • 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://kisikana.hr/userfiles/file/fakefotatiwulimexajasiv.pdf In PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/6f48f9c60e0df53cd5e5741876cae8e3/mejogugad.pdfIn PDF document text
    • http://stowarzyszeniemalyksiaze.eu/img/upload/files/wodebilifanuxok.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613676ddb5481---majutumikixuko.pdfIn PDF document text
    • https://10s317.com/uploads/files/202109012153392099.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1612f29983bd2b---fajidowimilisutixi.pdfIn PDF document text
    • http://contelex.it/userfiles/files/64481049428.pdfIn PDF document text
    • http://lingvastar.z-i-g-z-a-g.com/userfiles/files/10449637418.pdfIn PDF document text
    • http://bresky.cz/res/file/bifiju.pdfIn PDF document text
    • https://vresponse.net/userfiles/file/66423336187.pdfIn PDF document text
    • http://tantusmarina.com/UserFiles/file/85863373905.pdfIn PDF document text
    • https://anitt.in/ckfinder/userfiles/files/36619245909.pdfIn PDF document text
    • https://alpinebadmintonacademy.com/ckfinder/userfiles/files/rolunovumo.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/om2avssnqesdbp998skvt3r4q6/2388025827.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/41486222648.pdfIn PDF document text
    • https://aynadakikemalizm.com/resimler/files/vazimewo.pdfIn PDF document text
    • http://woori-tour.kr/FileData/ckfinder/files/20210907_5408401D7BFBFE2F.pdfIn PDF document text
    • http://jianianhuayule.a9188.com/upload_files/art_files/files/20210908_000146.pdfIn PDF document text
    • http://www.zdravotechnika.com/ckfinder/userfiles/files/7999928713.pdfIn PDF document text
    • https://ww150003.linebot.net/upfile/files/20210905232139.pdfIn PDF document text
    • https://www.hmgfinance.com/ckfinder/userfiles/files/mevoj.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/wofafej.pdfIn PDF document text
    • http://movesearchesuk.com/userfiles/file/86794725592.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/govomoweruginifuloludi.pdfIn PDF document text
    • https://giaynangchieucao.com/userfiles/file/jojeralesipegavozujabisur.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/39859704572.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=mezclador+de+musica+para+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_off0000e4f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F2 18268 bytes
SHA-256: 9f6bd052b7812c6f2691bc4e34cf4c5d46bb5a2c6c2120207b258bfbadca8c58
font_01_sfnt_off000113a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012bbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BBD 10728 bytes
SHA-256: 1112a6fa8cde09761a2484483a83bac669cd4340840e076de1edc2971d76de5b

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