Malicious PDF — malware analysis report

Static analysis result for SHA-256 26271a4e345c1f19…

MALICIOUS

PDF

99.3 KB Created: 2021-06-23 00:30:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 218e22ecf48d02f81c671875f3c7e2ed SHA-1: 5e7c5ecd4b39585a6f3eb1b190f040c2aea7dbd4 SHA-256: 26271a4e345c1f194de67a9b2eff0bc992dce03d857094013841186c3d6110f9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was detected as a malicious PDF by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites, suggesting it's used to redirect users to phishing or malware hosting sites. The presence of embedded JavaScript indicates an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://www.litesourcenc.com/wp-content/plugins/super-forms/uploads/php/files/e36d0764d877a20bf055663b1f42eedf/minogoga.pdf In PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/d9c973d4ce4dd9a72f57ac22ed818cfa/levagok.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c43b339c369---73516380267.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb504360d28---46922732384.pdfIn PDF document text
    • http://asustainable.com/global/file/18335144855.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/16085aa8b1376c---58670100952.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/1302823991.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/1132280cb3852ccda3ea96fb7d4e5ab8/32049131496.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609b28116bc9f---99538733126.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/35ca1f7905b294f8e71c38d8d73fb301/58167356673.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a9fc01b3391---kovelisibobewonalexelan.pdfIn PDF document text
    • https://newchat.xyz/js/ckfinder/userfiles/files/36735352607.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160886e220ce3c---jabowowamovozowofuneveto.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/ir9m5mtv70ft0rrfr584erhlo4/gibasejonize.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160833ab84ceca---18132609199.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/26d8i16a5bcr4j5lpnu2r7uf99/simomajex.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/020627379720.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/2bs9cj4s778is9vkc05c87aohn/vukagidemubonejorisa.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094b25ba06e9---funorow.pdfIn PDF document text
    • https://fanaf.comarticle_ressources/file/zaxawuworisuw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=la+production+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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000138fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138FC 4644 bytes
SHA-256: 55233dfa8fdcc0e1a7717aadd633d6e134e3ad056cfffaa91e82de8d9e7e9a2b
font_01_sfnt_off000148ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148CA 12320 bytes
SHA-256: 50d677439c2578dacf72afdec6227d1b1c59a2e6b6d1d1a9ef9e24974e086115
font_02_sfnt_off000171ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x171BA 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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