Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cc722ffeb3bc076…

MALICIOUS

PDF

78.1 KB Created: 2021-09-17 06:12:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 88c75c38123173b24f7c6bf6d82ef098 SHA-1: 46a4ff0fa67b5809206b322c54d3a24b2a531799 SHA-256: 3cc722ffeb3bc076c9069030222edbcf9c10c6cdf830ff1766278e9585f7a74d
172 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of a 'download button' heuristic further supports a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://lawtutors.co.uk/js/ckfinder/userfiles/files/vegetizudajekidasarujebit.pdf In PDF document text
    • https://steklo-shik.ru/userfiles/file/nalidezowef.pdfIn PDF document text
    • http://geoscan.it/userfiles/files/52315002894.pdfIn PDF document text
    • http://gotween.com/userfiles/file///jaxol.pdfIn PDF document text
    • http://efcosmetic.com/uploadfile/files/33939753310.pdfIn PDF document text
    • https://bepcongnghiepphuchung.vn/userfiles/file/fevemefenivedeposav.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/16133847d1308a---15296814719.pdfIn PDF document text
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/37251372774.pdfIn PDF document text
    • http://15441707.com/data/board/file/20210914000118.pdfIn PDF document text
    • https://atvatextile.com/upload/ckfinder/files/defolik.pdfIn PDF document text
    • https://renhedc.com/uploads/files/202109080452222316.pdfIn PDF document text
    • http://pnc21.com/files/fckeditor/file/75186446561355001859c6.pdfIn PDF document text
    • http://asid.rw/userfiles/file/40971502791.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/af208cff8844f1f518225c18f75eecc8/xurazosufetatubaposemev.pdfIn PDF document text
    • http://prplus4u.com/ckupload/files/63452656444.pdfIn PDF document text
    • http://dnt-mayak.ru/content/File/rawinifikibagipis.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16131ae5acbffe---fumiwuji.pdfIn PDF document text
    • http://bentleyplemtech.ru/userfiles/file/10165186034.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/0f010e78647af88aac6c3427085b946a/laseparuvu.pdfIn PDF document text
    • http://xn----0tbbbfo0f.xn--p1ai/userfiles/file/13258413698.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/xoguzejet.pdfIn PDF document text
    • https://alariel.be/userfiles/file/80200151512.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/59883311027.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1614014a5601f0---fefuvurujefibijanuwuxima.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff9aacb71d---namotikuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=oxford+ebook+downloadPDF 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_off0000cf58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e76f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE76F 10432 bytes
SHA-256: 9e4737be8cf3e486acb70a15c32c3d23e1236456ea67fbbe47979cc7b2423f42
font_02_sfnt_off0000ff44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF44 16924 bytes
SHA-256: 760ffa7d275bae30a2fc71be105541ce0d68d42de1351e68cb0a5c54737feb81

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