Malicious PDF — malware analysis report

Static analysis result for SHA-256 832b6adf6063f538…

MALICIOUS

PDF

85.9 KB Created: 2021-09-17 04:03:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9c3bca0ed154e04966c37c9270e4748f SHA-1: bbd4e8c00d328db2bf3f779387f3d82fb7f54760 SHA-256: 832b6adf6063f538829c9fb852e8dba1c7a6ed917e09597b4435a44bbfc22b3f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

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://oniceh.ru/uplcv?utm_term=android+8+emulator+for+pc PDF link annotation
    • http://food-cloud.com/home/food-cloud/www/site/site/data/files/xisusifuzufup.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/8ff304b6a749eadfe2cac39afc20c422/solixesu.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/pibepemalosilujefekalol.pdfIn PDF document text
    • http://polimak.pl/userfiles/file/bojikisajowub.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/vozatubavonakisewoxedab.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/50285022296.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/nujuvasanizurixaxunuxo.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161354532ab260---53557883092.pdfIn PDF document text
    • https://sarvodayasamaj.uk/upload/files/36770901307.pdfIn PDF document text
    • http://langmoon.jp/js/upload/files/xinalesaj.pdfIn PDF document text
    • http://uat2.hkha.com.hk/ckfinder/userfiles/files/69511624064.pdfIn PDF document text
    • http://crocepadrekolbe.it/userfiles/files/tevagegaju.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec0691a369---dudedozalif.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/84525202646.pdfIn PDF document text
    • https://morabia.fi/images/file/73253957954.pdfIn PDF document text
    • https://actor-conseil.com/files/file/88173889691.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/5da5699f7953cb6e58c0f6d77b587972/lotemiraleged.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/c2890bccaa4a40a0cde1dde032acceea/38982609947.pdfIn PDF document text
    • https://art4you.sk/editor_uploads/system/files/vimijudok.pdfIn PDF document text
    • http://strategie-online.net/catalogue_dynamique/file/38772372473.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16131523f6e467---gupunuzuvusiwij.pdfIn PDF document text
    • https://bfull.ru/uploads/files/54704607366.pdfIn PDF document text
    • http://sallytour.com/FileData/ckfinder/files/20210909_4C9C70F24087067B.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/negiwid.pdfIn PDF document text
    • https://braindevelopmentmaps.org/userfiles/files/nusoneke.pdfIn PDF document text
    • 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_off0000ec9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9C 17040 bytes
SHA-256: 0e60abb3fa33d0cd36a0ddd875017eb029cf6f18dde0cf7ae0616b0909dc331a
font_01_sfnt_off000118dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118DC 10904 bytes
SHA-256: 89cf4de203fd2985f7c198d9c80f03cb36df897a9c86f7c8563b4f6811dcc51e
font_02_sfnt_off0001321a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1321A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1