Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3e598c09249af3a…

MALICIOUS

PDF

89.6 KB Created: 2021-07-09 02:38:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: fde63788e12c9f54f0dd537d48c4a70b SHA-1: 8a556e7c4786107d609b8fff382a1b4147ba4d76 SHA-256: a3e598c09249af3a622666dc639e5adbfd73360d82a015a17c8fccbff63e4c44
164 Risk Score

Malware Insights

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

The sample contains embedded JavaScript, which is often used to exploit PDF vulnerabilities or redirect users. The PDF also functions as a link farm, pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites. These links likely serve as a lure to download further malicious content or phish for credentials. ClamAV detection and ML classification strongly indicate malicious intent.

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://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/160920c3ec0fc9---bibidepigitul.pdf In PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16071be32f1247---zawowononejefagixeritanek.pdfIn PDF document text
    • http://shsclassof1959.com/clients/a/a7/a7a82b2a6025f7fafce5d77be70bf845/File/zovawujibopetep.pdfIn PDF document text
    • http://srutimusic.org/userfiles/file/vuluwojoxumeta.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/2rarb37vfspd0ufkieqmgumh1n/zevuk.pdfIn PDF document text
    • https://go2germany.ru/files/file/xegaditupa.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/6927710309.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/f984dd3f5fafc56b0bdcd53d73a9777c/83759178565.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/1221247089.pdfIn PDF document text
    • https://polskieplytki.com/wp-content/plugins/super-forms/uploads/php/files/5b9e719241fd905e5b60ea0b68443e39/35314636100.pdfIn PDF document text
    • http://www.themixchange.com/userfiles/files/38355626966.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6d8c6ca87f---55178383213.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3d0e66da12---46294194426.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f75651ef2---lidojawenusixitu.pdfIn PDF document text
    • http://4bx.pl/public/file/pimuwowomefosojuditir.pdfIn PDF document text
    • http://signaturecruise.com/js/ckfinder/userfiles/files/leruj.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/25189023868.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name//files/webuwibamulazuketotu.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/79623471518.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/89546506405.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/29134783649.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/4nicr4trqrbcmhe4ekomudg8k1/90180600023.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/00262ae3e0e4c63a774357799c85e021/38197274300.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=ms+dhoni+song+pkPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ffcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCC 10220 bytes
SHA-256: 63135477a09fb656c8413ec69a6e35cf5f174c076449f729ab98e09f7fd575c7
font_01_sfnt_off00011650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11650 16924 bytes
SHA-256: e86d781568a850cd59829f194f2ab151ca341bcdb17277ddbeed51b7853aef5e
font_02_sfnt_off000142a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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