Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7d4e0a083d512cd…

MALICIOUS

PDF

70.3 KB Created: 2021-06-27 08:41:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: f89dbd5afb6894be067c54ab0cc8d00f SHA-1: 15eeddb600618f3403393c5a3e7167561235c491 SHA-256: d7d4e0a083d512cd77adf1a72deaf496cde827b04f8ea187aeff7d3ea451b375
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV detecting it as a phishing trojan. The file contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://laborke.ru/uplcv?utm_term=geom_line+by+group PDF link annotation
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/58df0a6c2e796deb72d835901332cfc4/53083263099.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/pavojovajuvirororax.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160becb043e447---fovivovavoledezagozinek.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f57e234df6---83581631975.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/wodozunedidub.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092d4aa3a7e1---37210088115.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/872589e21a8817b116f9fca34ebcf4ee/59056860070.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/wuxasunoxitanoxoxif.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/751b35d647e1afe411d46be45f6e846a/24332805161.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/banusijofokowazegobiw.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c404bdccda---mamedig.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/vozorez.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e3ab9e218---wabimawipoju.pdfIn PDF document text
    • http://abwingssuffolk2.com/uploads/files/24055642979.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16092089962039---bixeredoxuxegamegiwesezix.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/96d9563532b56f8d43c9486539e6f699/wewexeminenisiwujom.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf4a0ce8b28---41778677394.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609b5a16df34f---mekuk.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160bc6c394f26b---pefajexigirabekenu.pdfIn PDF document text
    • https://chemasan.lu/userfiles/files/wajedofijosavaw.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/2a51632badbe83010a8c3d1bab34d697/podegupekozoroguka.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad319132461---71613811999.pdfIn PDF document text
    • http://18554080.com/userfiles/file/zakijajejumisido.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_off0000b320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB320 10592 bytes
SHA-256: 5aee0b9b23c75c80cf87ccbc7a5f2e68d3425499da6eb4822e708c08a9da13ed
font_01_sfnt_off0000cb08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB08 16800 bytes
SHA-256: aaa37a3d143e3936bf931b473593357d07e6ea4299d1d522be7898fa008a0b58
font_02_sfnt_off0000f448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF448 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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