Malicious PDF — malware analysis report

Static analysis result for SHA-256 18d87c3ea33e3d51…

MALICIOUS

PDF

78.8 KB Created: 2021-08-04 05:05:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2046e8ff0764c421f81f1a070168d52d SHA-1: 7003ee4762d32f6a23012c90e54eee4f86cc6370 SHA-256: 18d87c3ea33e3d51ac05115132f286a8d8a360058d6fcae9582ecf9b0a36f1ff
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and other disposable hosting. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/0c8f204e0b52f5c939544834912597d6/petewagumapanedejovokuji.pdf In PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160791c67a321c---juwovabikututupusopon.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609842c098fe6---21132779192.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/49179911949.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/pufarodibiwinolekal.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/91b05ce1030937d40ac51ddd96563a70/digafizasefugidasamibepet.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/kotonixedelidikujib.pdfIn PDF document text
    • https://preciseenergygroup.com/media/29578190444.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a35dc35d1---39149851628.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/jovofixedavelabikaji.pdfIn PDF document text
    • https://firesystem.ro/imagini_ws/10284466404.pdfIn PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/taxakomujidar.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a0730642a1---58175045002.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/pimajakatopemavejuteler.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/0lju2jpgbkv0p7o101t9tals3j/taruxijasodatel.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/aoam8i43d61jahsehi7490j2t5/gepawajisizozopen.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/32528971734.pdfIn PDF document text
    • https://eltonltd.ru/sites/default/files/uploads/24579308246.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a45c2ceb5---mojarixigivid.pdfIn PDF document text
    • http://hanilkwanla.com/uploads/files/guzijujudowaki.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/rbbubrpvvsma0qjajc0p6t7i97/zebepaworoto.pdfIn PDF document text
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/gijok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=cinderella+and+four+knights+ep+7+eng+sub+vikiPDF 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_off0000c2e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2E7 16272 bytes
SHA-256: 50a1d9a827b1c22d72d01a641821a98305be6d460ac612f6bc58cbd5c2b4525d
font_01_sfnt_off0000ecf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF7 11256 bytes
SHA-256: a406a5957d4f1341b10e0ae5d3ca6f977bf4ecc0170cbe56aafd2576fe1e717e
font_02_sfnt_off000106f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F3 2964 bytes
SHA-256: 44fe9fa20d3c86cfbbecb5e01e413e9441a1f914dc5acb5c1a8f3e45343978a7
font_03_sfnt_off000112ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1