Malicious PDF — malware analysis report

Static analysis result for SHA-256 c32375367d54167c…

MALICIOUS

PDF

80.9 KB Created: 2021-09-18 04:32:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 8230584cc07697b566e2643c9d2b8efe SHA-1: 21b38aa3bd63b005aa18731317386c43ea8beaf0 SHA-256: c32375367d54167c1a2eb03a546786b688765adc3c3a0aca321d91e987731c15
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file is identified as malicious by ClamAV and ML classifiers, exhibiting characteristics of a link farm. It contains numerous URLs pointing to compromised WordPress sites and disposable hosting, likely intended to redirect users to malicious content or phishing pages. The presence of external URIs and link farm heuristics strongly suggests an attempt to lure users through deceptive content, potentially related to search terms like 'minecraft download'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://krisoc.ru/uplcv?utm_term=minecraft+download+java+edition+android PDF link annotation
    • http://xn--989ap7r0xbd5x.com/upload/fckeditor/file/88765647161.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138374fe27b4---zoxaluz.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/fcbcb50b1c38309597ce07f8324da222/felub.pdfIn PDF document text
    • http://biomax.shop/filespath/files/20210909212942.pdfIn PDF document text
    • https://inoxquochoang.com/app/webroot/files/images/pages/files/67598690249.pdfIn PDF document text
    • https://propactionvehiclesuk.tv/userfiles/files/1615519298.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/u84ehb6736kv2pftmdg1389jj2/39519214322.pdfIn PDF document text
    • http://nissanotogovap.com/uploads/images/files/5525578533.pdfIn PDF document text
    • https://alquimia.in/admin/fckeditor/editorfile/63329372807.pdfIn PDF document text
    • http://jeyadhurgatemple.com/userfiles/file/20951886219.pdfIn PDF document text
    • http://jlsxjy.com/right/UploadFile/file///2021090319483673499.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16130dbf50d18f---70418786789.pdfIn PDF document text
    • https://nevisnews.com/userfiles/86450144175.pdfIn PDF document text
    • https://aristi-trap.com/upload/users/files/3811782057.pdfIn PDF document text
    • https://www.tvmreza.tv/ckfinder/userfiles/files/kemavakejafut.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f23258d59e---diromuradi.pdfIn PDF document text
    • https://kampusogrenciyurdu.com/file/54411481767.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021090304465786.pdfIn PDF document text
    • https://www.agcontraincendios.es/ckfinder/userfiles/files/zipisadopugodebabade.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/51919189377.pdfIn PDF document text
    • http://fkm-lux.by/var/upload/file/majunuzilonemowoxuxibis.pdfIn PDF document text
    • http://areaengineeringsrl.eu/userfiles/files/65153232125.pdfIn PDF document text
    • https://tnmkor.com/FileData/ckfinder/files/20210901_2AFE16AF6B5741B3.pdfIn PDF document text
    • https://samajsutra.com/userfiles/files/siruxitimadazadomud.pdfIn PDF document text
    • http://bmfjhjk.friend-match.com/upload/files/68539819740.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_off0000d571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD571 10576 bytes
SHA-256: 4446228120358b98afbd05a4c2716278c5a8fcd82e850444aec84b4dc4efd277
font_01_sfnt_off0000edb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB2 18272 bytes
SHA-256: 853dfc8ced5df2511583caac3422e76ed49351a08056a2716bd5b960ccffd271
font_02_sfnt_off00011d8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1