Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a16bc7eddd20ab7…

MALICIOUS

PDF

83.5 KB Created: 2021-09-15 03:00:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f375f465563fac2069aa761333c1f2a7 SHA-1: 6ca4a968ac1aa5b68e0ecd5b602f7a9dc83bc1ed SHA-256: 3a16bc7eddd20ab7beb0c397aae38a3faea134aa2bf4b8b35285ba8445fb6f93
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The presence of embedded JavaScript (T1059.007) is a common technique for exploiting PDF vulnerabilities or initiating malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://punaide.com/userfiles/files/zuwaxifulasaz.pdf In PDF document text
    • https://actsonics.com/uploads/files/202109042311558244.pdfIn PDF document text
    • http://bnblspecialities.com/userfiles/files/wenigevuxe.pdfIn PDF document text
    • https://australiancaravancentre.com.au/application/third_party/ckfinder/userfiles/files/74600173663.pdfIn PDF document text
    • http://noahmission.org/dataroom/file/zovemugena.pdfIn PDF document text
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/vokesuba.pdfIn PDF document text
    • http://quangcaosmsgiare.com/media/ftp/file/gafetekixokerusuleruge.pdfIn PDF document text
    • http://proxima-design.cz/files/file/91669573762.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/piderixemosavi.pdfIn PDF document text
    • http://familiegravesen.dk/ckfinder/userfiles/files/44070957960.pdfIn PDF document text
    • http://natpuedu.in/userfiles/file/suvut.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140d522a3876---85503832872.pdfIn PDF document text
    • http://logicparcel.net/uploadsEditorfile/zixibu.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/juzolifisanofujexezotixef.pdfIn PDF document text
    • https://hijaulumut.com/contents/files/15497969935.pdfIn PDF document text
    • https://www.babetravelling.com/ckfinder/userfiles2/files/43463635300.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d98481a9ba---mogijum.pdfIn PDF document text
    • https://bisleriuber.genefied.co/ckfinder/userfiles/files/birugevofuwapoxo.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/lsmaf04f7gmu6t6gpj8pj3i008/57526986383.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/zixorefibazit.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/47331544338.pdfIn PDF document text
    • https://zenit-npk.ru/files/file/11518014784.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/7a3371530dbc5d6c729be8d342b53570/26915909082.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f60b8f8a3---35283390347.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=hordes+of+the+things+rules+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_off0000ddcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDCF 19272 bytes
SHA-256: 11f2116e2a8f7a0a436c51f81e7e96df5cdb155c878bb74401781bdb654871d0
font_01_sfnt_off00010fb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127CB 10704 bytes
SHA-256: 571f073de9e53a76d3f2e7a3eae19a386b8e399646c41c9136aafa8d97bd0b54

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