Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d2ced7b5fb8d395…

MALICIOUS

PDF

79.6 KB Created: 2021-09-22 23:06:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 16c86a27ac46471f629c2767603a5d38 SHA-1: b588e0d00607126fc4c32a6db799c5e938a93c69 SHA-256: 5d2ced7b5fb8d395b317c6a348b67246bb545723c111dbed30e20a1378c38da2
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document, potentially leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://cructi.ru/uplcv?utm_term=s21+vs+12+mini PDF link annotation
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/jefukajopepowu.pdfIn PDF document text
    • https://polymadeniyaglar.com/fckeditor/userfiles/file/86634810577.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/37875431905.pdfIn PDF document text
    • https://toananhmedical.com/uploads/files/1173178388.pdfIn PDF document text
    • http://servicedental.it/userfiles/files/kekepopevetiwafi.pdfIn PDF document text
    • http://seteo-dechets.com/images/file/vepidal.pdfIn PDF document text
    • https://softwebstar.com/shop/userfiles/file/47751236497.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/70937883057.pdfIn PDF document text
    • http://nemochem.cn/upload/files/72373464156.pdfIn PDF document text
    • http://dongsimkindergarten.com/upload/files/33279283737.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/36681052637.pdfIn PDF document text
    • http://noithatachau.vn/webroot/img/files/zitipabewumunupere.pdfIn PDF document text
    • http://2446665a.ru/ckfinder/userfiles/files/jowafodefeduzoxememaw.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/51728818367.pdfIn PDF document text
    • https://citronixdeflection.com/nbloom/fckuploads/file/mujavigud.pdfIn PDF document text
    • http://sten.kr/club/data/userfiles/file/20210902012738.pdfIn PDF document text
    • http://commissioncollectionlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nilulexo.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/7140ae7d7811b5154d08c352d283249b/jisazogi.pdfIn PDF document text
    • http://kco.su/userfiles/file/41046334907.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc662430f5---48280012831.pdfIn PDF document text
    • http://sinoscaform.com/upload/ckimg/files/202109081116049467.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/humdu6sa0iclpk1pus1n36kkrr/nukiwawe.pdfIn PDF document text
    • http://www.hausbaumesse.at/ckfinder/userfiles/files/xijabidojefosapuvuxif.pdfIn PDF document text
    • https://specializedfacilitymgt.com/public_html/userfiles/file/masezijami.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_off0000d607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD607 9924 bytes
SHA-256: 07985893c2c93c6c23b6754ddcdc2ca575e66805ee48625ae22d8e2e08a01849
font_01_sfnt_off0000ebe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE0 17472 bytes
SHA-256: fc73c8e1ba03616c87d2f4e635a4b91fdefae89de349769a8121fbfd0b214c77
font_02_sfnt_off000118f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1