Malicious PDF — malware analysis report

Static analysis result for SHA-256 4024c7c634dfccb5…

MALICIOUS

PDF

94.2 KB Created: 2021-09-04 09:48:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2c031d98bd1093d6c65cb3b6ccc28eac SHA-1: 6048e2173d130d3dbec6df39bd0552b8cc1ce848 SHA-256: 4024c7c634dfccb5992672887879a872d28c87d98c96f87b438d5320fd1d8827
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised CMS uploads and disposable hosting, suggesting a link farm designed to redirect users. The PDF's structure and the presence of these links strongly suggest it's used in a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4a7b6afbfa---dalatebubowefe.pdf In PDF document text
    • http://4grd.com/cmsimages/file/xojakugi.pdfIn PDF document text
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086945364b27---87994356099.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/q62e88jviotmgvaq5luqf3942f/20684138582.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/gp5kuj9prnmhdlv8p39jej7ob5/51210707205.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160861596c005a---pedasovarevariwubukalexev.pdfIn PDF document text
    • http://abbwingslynnhaven.com/uploads/files/dijiwu.pdfIn PDF document text
    • https://lawrenceyezersky.com/userfiles/file/74344314567.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6b12a8d01---3543973754.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d188cccdb79---34672643773.pdfIn PDF document text
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/beae12f00300e6512d2cdd2d9d8fed0f/93849175600.pdfIn PDF document text
    • http://sam-global.info/files/file/mejizufofi.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/8p3vssur4iirs2si9nlbjofns3/73475801958.pdfIn PDF document text
    • http://nikacarpet.com/My_Project/Hamishe_bahar/ahar_img/files/dubarenidebajokewaxajisiz.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/mefipasigididodudus.pdfIn PDF document text
    • http://vcelari.naceradec.cz/includes/ckfinder/userfiles/files/lanujog.pdfIn PDF document text
    • http://theofficeplus.com/userfiles/file/pevudopepibubenu.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160e8d42fcfdd4---39955729543.pdfIn PDF document text
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/c134009e41c3e18bfea323af61e5e930/77552339348.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/4052c08bb7622439103734d10c2450f3/70858355698.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/wipuvapusovezaxukarozaza.pdfIn PDF document text
    • https://paperland.bg/uploads/file/62444481526.pdfIn PDF document text
    • http://pdww.ru/ckfinder/userfiles/files/jibifipiriludikidojevinod.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16089f90cbd6c5---xodekumezepufov.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/sakotiremajafixonojepes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=chess+rules+in+tamil+pdfPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e310.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE310 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB22 25316 bytes
SHA-256: cef0d8592d9cdb11e2b6173c28f914e551acdd7183619e82529e87a2158d6746
font_02_sfnt_off00013bab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BAB 16416 bytes
SHA-256: 7d08e1d0ad0fccf0db34989b3c15b8142814363e18df2bb78d91528aa4339ea8
font_03_sfnt_off00015256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15256 10772 bytes
SHA-256: 0d2e787e109c3e1eb8aeb778bcfc59e2227f4083074490886e3c357668b3b633