Malicious PDF — malware analysis report

Static analysis result for SHA-256 76f26fcb099c906b…

MALICIOUS

PDF

70.7 KB Created: 2021-09-05 23:44:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c82edf074e4caf9046512b69d14335ce SHA-1: 24e43a304f92d832fa6a60431b43398eedc08a99 SHA-256: 76f26fcb099c906bbe9d1d7f1fc9ce999405d851e54fb7b18aa50265977805ef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://pixomot.ru/uplcv?utm_term=40+hadiths+imam+nawawi+pdf PDF link annotation
    • https://at-studio.tw/app/webroot/userfiles/files/20210724_125652.pdfIn PDF document text
    • http://apsencollege.org/test/fckeditor/file/70383973120.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/4b26f34bd0f1d89255c2cbb9c90c4aee/napokogotasin.pdfIn PDF document text
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/01b44255c3cc049f270db72753c60313/kavagalarota.pdfIn PDF document text
    • https://hocaukhudothithanhphogiaoluu.com/asset/site/files/pazufowugejijazilijedile.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/dj6htgh6rmumcr5q0pas4frl2e/26263624963.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612af5f77a1ff---lodepenabesovujukagezig.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/tobikumek.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/4dd0f5d116c03a446ac001a5e2705a38/nozepuxovironupiro.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/5c557d1a69135469d62046cc0dc6ba8f/20370521720.pdfIn PDF document text
    • http://massvt.sk/editor_uploads/system/files/26465994321.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/62940307681.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160eda90d81a6b---28805350028.pdfIn PDF document text
    • http://axwelindia.com/uploads/zerabusupe.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/kebukizoxenufujugedekako.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/d8c9312313fa39fdb125a8fde936ecfb/lotexebeduwesupoxat.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/14q7cea4jtfaee5ltob8du98t8/78895627303.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/86478748785.pdfIn PDF document text
    • http://starlightcelebrates.org/clients/4/43/43e9139217482d7666ce300faf566241/File/23987070388.pdfIn PDF document text
    • https://yellowstonewildlife.com/givejakuta.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/8066069147.pdfIn PDF document text
    • https://weldingportal.it/userfiles/file/pixuniweposikeluwipuf.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/0896d797c51b30463214fb5f53659321/xomatenanub.pdfIn PDF document text
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/f890cf04360bbde5fadd9627367daa10/34115612103.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_off0000b5ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5EC 10552 bytes
SHA-256: d4414192b26cf27924227d96e991877de9276af4191f940a7146fd85522dc447
font_01_sfnt_off0000cdd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDD4 15552 bytes
SHA-256: 5cf0adc0eda65874cb12055a5fb37fc96b66dcd126f9fbe3982da4c9914b7c26
font_02_sfnt_off0000f570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF570 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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