Malicious PDF — malware analysis report

Static analysis result for SHA-256 e47328535f91ab7d…

MALICIOUS

PDF

84.3 KB Created: 2021-06-30 22:46:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 0afebd09a94916e8f19dea8da0f78c98 SHA-1: 096b0599ecc2eb457b17db344ff339c1bb2e2755 SHA-256: e47328535f91ab7d76190586a7a6ab2e7c81cf0433ec06a8210a3f3b5b4f1927
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS upload storage and disposable hosting. The document body is heavily obfuscated and unreadable, suggesting it is not intended for direct user interaction but rather to host malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://sogelec-eng.com/files/ckfinder/files/kafinezurifiruxugokuji.pdf In PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c5e8228c514---janasoxuv.pdfIn PDF document text
    • http://bainihu.com/upfiles/editor/files/82154622338.pdfIn PDF document text
    • https://www.visitrwanda.com/wp-content/plugins/super-forms/uploads/php/files/48c00a22ccf9209068c4ee916885439a/21816676356.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1607438f2f4165---mikoduzugixegelusigofamis.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092521c7f268---tifoladojuwerexesusilelik.pdfIn PDF document text
    • http://asianaccounting.com/admin/fckeditor/userfiles/file/zipabekivokulujojopaviz.pdfIn PDF document text
    • http://quiltingacademy.info/fckeditor/userfiles/file/90905437981.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/4fbdfcb18558ba53ab8b0afc040096c6/902245636.pdfIn PDF document text
    • http://cc-loges.com/uploads/file/jevotas.pdfIn PDF document text
    • http://immobilieninvestors.de/userfiles/file/jogokomi.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/sofonejarujemoga.pdfIn PDF document text
    • https://et-auditing.com/userfiles/files/toxerudifageponovonexuz.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/9f93e7d6fc3de269e7ef30ff4b2f9c67/54424882749.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1607433a219c61---pojuragawejefirubuzizux.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/b2102d581837a6f97ed242883f6af4d5/94379302904.pdfIn PDF document text
    • http://mimarkamilozkartal.com/userfiles/files/benivat.pdfIn PDF document text
    • https://giasusinhvien.net/upload/files/xozapafizipebiv.pdfIn PDF document text
    • http://webbuilders.com/files/file/29319407152.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/9bf199a0d6af8c426541e68855adb626/78177625616.pdfIn PDF document text
    • http://househouse.it/userfiles/files/notipewubuj.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/pekazamumuribag.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092edd66eb7d---92480493033.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=traditional+catholic+feast+day+todayPDF 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_off0000e77f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE77F 16968 bytes
SHA-256: 5e7d38ded31d472a5c16f6f5ceb49f6595f3d326224f9674c37655894f4a971d
font_01_sfnt_off0001138f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1138F 10648 bytes
SHA-256: 660e3fb3cef1bd1c798cbd8d0e2849e25c027b77929965bb97d56c28c82aa57b
font_02_sfnt_off00012be3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1