Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5558304c2e2a404…

MALICIOUS

PDF

93.4 KB Created: 2021-07-03 20:56:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: aa3bb78aa2d305a0295add473458dba7 SHA-1: b6321e9d041f1aebb8175bd391c7c3989c56b9f0 SHA-256: c5558304c2e2a40445bb5ea1dfbb0608674c91d95734f2879e6113e84adab27f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a lure for phishing or malware distribution. While no scripts were explicitly extracted, the nature of the links and the PDF format suggest potential for embedded JavaScript to facilitate redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9822

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://inwebjor.ru/uplcv?utm_term=the+complete+notes+from+the+universe+pdf PDF link annotation
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607e88cdaf885---memujolapi.pdfIn PDF document text
    • https://celovechurch.org/wp-content/plugins/super-forms/uploads/php/files/848025697e10aa22dc2a5b8314a8bdad/56887643414.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/jkukglmsknmagmnf2r9fgv80e2/23221874809.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/19117612250.pdfIn PDF document text
    • http://chothuethietbi.info/img/files/nonudobarivujene.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/1d540f9c40e422a9e0ef3421298fd107/puviloxujexonifibudiravi.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160946a202fac0---wazeguburigufoxodiw.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160721e89d8b36---lolalixuwewomel.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/2lj3olajsgmmqroensihionm50/76884557656.pdfIn PDF document text
    • http://minuspk.ru/minuspk.ru/userfiles/file/16940678973.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/5f53e60c1b14deffdeb03f160e8f1f62/jokadugikenonivefaje.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/kuvezurifezodugiziw.pdfIn PDF document text
    • http://mamnonlittlesun.com/upload/files/lored.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e80842f6da---23590440545.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/5mr6k357liua4phb3ckmspjo76/84561651642.pdfIn PDF document text
    • http://korean-school.hu/hangul/userfiles/file/94021144438.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/28572697200.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d40d30af3---lakazawemele.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/8c903ee53a3f2e071f3933ca4e091b7a/34090699646.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/f22ab119ad4ab5cd88db82601b50db48/86958767509.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608db034403e1---90326167178.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/43310015903.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/dpo48sp0aq30plgajretckjob2/11626463938.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/ln54jmi3cddkfdcppr928u94aa/tanoposovogo.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/60a825f25fdac19d8559f929e9c907da/jasemixedigikewugixowe.pdfIn PDF document text
    • http://attlas.center/userfiles/file/40227608977.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ba811798eff---peginilez.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_off00010b55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B55 10852 bytes
SHA-256: a1690b56c7a058410be6a09ad66b4ad9db8fda3de37eb75c4c82f5d096982cde
font_01_sfnt_off00012430.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12430 16672 bytes
SHA-256: 92cc041059ea87e6ad27c45f73331ffc517afad3a28580fbfb90462f2d6f5698
font_02_sfnt_off00014f8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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