Malicious PDF — malware analysis report

Static analysis result for SHA-256 1653e418c85cc6c2…

MALICIOUS

PDF

91.4 KB Created: 2021-08-21 16:08:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: cb506dbcfa118dd342f242d8e858f848 SHA-1: d136bd74ac105361c3f080f499ad44b24de6ff4a SHA-256: 1653e418c85cc6c2c96951913c6e2aed2fe9d376a3094daa1baa86d73633ae20
156 Risk Score

Malware Insights

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

The PDF contains numerous 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 related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or content-luring attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9726

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 http://gpmpoolandspa.com/ckfinder/userfiles/files/povopitasakikosisisa.pdf In PDF document text
    • https://laplacedesstores.com/upload/file/nafuranaf.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/e11b3bcb098c1a3425e7da505288e18c/zudotalotutapetitulo.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/b7fa0e472a0f996962cfd1fa1b99887b/25062369536.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/83190069814.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/161155fa5db504---vorafu.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/judopabavefowa.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/keforomuwugosevijixokoz.pdfIn PDF document text
    • http://japan-railpass.info/images/blog/file/90851645660.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/5226823329.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3384a61b05---25009088197.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/a7b959813963d45c3c1c249e03c7fac1/22811563879.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/3380b71e02fa8556e1b025430f2dc52d/pixovekusanexovuse.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae2ef7f1899---fogaxoxixadakarelob.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/2a3293f66eceac9084d0eede5acbf681/17806369769.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077f7cbc64a0---fugifabubik.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/7hte157u0d2g1hikf5ugfai2k3/vowesewabesozu.pdfIn PDF document text
    • https://ratsimae.ee/media/contents/file/kuxoxininunaxiwusekipemet.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c070e58b26b---59255156136.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/b1d66025e1b56dfbfa2409279cd507da/lokijakigusapujo.pdfIn PDF document text
    • https://negaratoto.com/contents/files/tewilanuzuzapagajusoret.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094407ee1ca6---wawoxiwamazibivil.pdfIn PDF document text
    • http://askort.pl/Upload/file/65501700474.pdfIn PDF document text
    • https://bayihoki99.com/contents//files/95581995160.pdfIn PDF document text
    • https://ev-owners.jp/userfiles/files/jitemamimik.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/5280a15fb3a036a29e01c55fd2d30d59/kosolonepibugawotox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=peter+pan+2003+full+movie+download+in+hindi+720pPDF 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_off0000e9a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A1 17344 bytes
SHA-256: d9bb684ba7b506242042c0ff18678c6e27a420d976809c57a296018d7b6cff19
font_01_sfnt_off00011712.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11712 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F29 11312 bytes
SHA-256: d180a4513a0463fa8b93f54d1fe80fa6ebfe54338be63e9d273016319b94606f
font_03_sfnt_off000149ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149AB 16060 bytes
SHA-256: 8bfc5e2f6383778b4716e60c732a7e5228106b692ca52c1f6b3c0b2892049825