Malicious PDF — malware analysis report

Static analysis result for SHA-256 30b7b3892a3dc502…

MALICIOUS

PDF

80.8 KB Created: 2021-08-10 19:50:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 41c556c9c8a5b7f5d16766d607c56d0f SHA-1: e3699ca75b72970de84d69c59e14e3c2710451b9 SHA-256: 30b7b3892a3dc502a2ee617fcf7b561186781c3d51a248295d71c2b29b4b5924
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to numerous disposable domains and compromised WordPress sites, suggesting an attempt to distribute phishing content or malware. The presence of embedded URLs and the nature of the heuristics indicate the document's primary purpose is to redirect users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 https://krisoc.ru/uplcv?utm_term=how+much+oil+does+a+2008+pt+cruiser+take PDF link annotation
    • https://aduanaldelvalle.com/userfiles/file/zepurixerofim.pdfIn PDF document text
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/08ebb36f226a426331809611a1041458/kagavurovisesesogolowi.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/adm9j4asb4mtciomp5msp8jlnq/bunefafulanovav.pdfIn PDF document text
    • https://doitoutdoorz.com/file/BVqUNontxZRcbQ48.pdfIn PDF document text
    • http://xetaihyundai.net/upload/files/49233466246.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a57aa4236b5---77589927856.pdfIn PDF document text
    • http://utopiasacramento.org/clients/0/07/071cdeedc048305be324eb10ab8031d4/File/85197118811.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ade8e330a4b---kigera.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607694b0d37c0---juwagexetezakafaloguf.pdfIn PDF document text
    • https://stallion-international.com/userfiles/file/suxojezekosukitorata.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a8ac1a0ab3f---21463361461.pdfIn PDF document text
    • http://ledins.lv/cms/file/zidudalubepumazonat.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a27c7c819f---68185518046.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/26568432992.pdfIn PDF document text
    • http://sadiqandsons.com/userfiles/files/1691384454.pdfIn PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/fb832hrvb4plc5tgum7spmdld3/pufabakelusufavisubunawi.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/89d9bea2f90d91ff7c9488a8cefb690d/gejesarunelamedeku.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16111a5e65fa88---bufumibusujokuvo.pdfIn PDF document text
    • https://www.hinkler.com.au/application/third_party/ckfinder/userfiles/files/kinoju.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/168693d2e9e0905088e7bd37b0d3e8b8/xikijawapi.pdfIn PDF document text
    • https://goodmix-psc.com/userfiles/files/bajalekotebilisajalilara.pdfIn PDF document text
    • https://northcoteplaza.com/userfiles/file/82491480632.pdfIn PDF document text
    • https://jhservice.net/imagenes/galeria/files/kureromexatalofofim.pdfIn PDF document text
    • http://prime42.ru/userfiles/files/bofusebelowobamifozekat.pdfIn PDF document text
    • http://easternhoteljeju.com/FileData/ckfinder/files/20210616_B4BC10360F061011.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_off0000d4ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4EC 11396 bytes
SHA-256: 42641ad1a19aaae72a8faddb7b6bb1a328daf962a768f18426003e58d9e68603
font_01_sfnt_off0000efdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107EF 16968 bytes
SHA-256: b12b490eb62e6e409bb2c23b93452012e8f74545764128b6f853b2fd231a6d7e