Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb0e0fbf9010ed90…

MALICIOUS

PDF

86.7 KB Created: 2021-08-16 10:34:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: acbdb69f976278df1f38c2febce763ab SHA-1: 75f5f359a2d9d6ae96caac0e1525ff7d10300c2a SHA-256: cb0e0fbf9010ed9042b0970904d9dbeba653fec84c4e7105e7b279efaa4f72b5
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 designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://philabc.ru/uplcv?utm_term=how+to+convert+graco+nautilus+to+backless+booster PDF link annotation
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b3fc015da19---xixodixetuvakane.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/19689051845.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/8dcbaf5a362c9f55e10f3e1f7f1b64fa/32755912254.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/17011701084.pdfIn PDF document text
    • http://clarkhigh72.com/clients/3/34/34275c7d49a174b5f6cf03bf5966da6c/File/75650656483.pdfIn PDF document text
    • http://www.eau-msu.ru/ckfinder/userfiles/files/ziwirurebod.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160941692d31cf---95956064918.pdfIn PDF document text
    • https://jmtours.co/aym_image/files/nawipipamugozafusud.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/597bf75b3a84a43a96a95800b2ebc409/98667406536.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a733ae5c1f2---36680223432.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/gimidimizegorodo.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/b9e3cb01afe4c0006cb8cfd8da80a01b/40130705053.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f936ced842---kopukoxivomazaxod.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160c010bcdda77---majukoperejixomexuzino.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/8e8eb0ba83be1eb993b3665565728578/16074835814.pdfIn PDF document text
    • https://braindevelopmentmaps.org/userfiles/files/rexisewodisusud.pdfIn PDF document text
    • https://aicpwdosaeast.com/ckfinder/userfiles/files/40226164991.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/vafukujowagigatetimiz.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/75ee8f572188a6137223522522f34a69/goluborimapitu.pdfIn PDF document text
    • http://fautographie.org/images/userfiles/files/fozulirixasufaneluwoz.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16076559062e4d---vepadifixipow.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6b67085c7---memewisedubada.pdfIn PDF document text
    • https://gamma-electronics-eg.com/userfiles/files/tadumopapazuvojakil.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_off0000ef0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10726 10880 bytes
SHA-256: 42f8c6e93ca3cbd2782e3ba174e16ae18e737f9a35936a43c4b1744d81f20139
font_02_sfnt_off00012075.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12075 16692 bytes
SHA-256: 1fc1841f0557ae9f175360d4da95d9e3e67ae240c4e9015cf080953affb27a49

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