Malicious PDF — malware analysis report

Static analysis result for SHA-256 64939e1e81287369…

MALICIOUS

PDF

89.2 KB Created: 2021-07-07 18:59:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 97399e78bda9ac93b656a6b2af536a2b SHA-1: 279ea61c3f46eca5b13ca3d4a97cc62c0e5cbb65 SHA-256: 64939e1e812873699fbe8c06aa4bb8b79b59bb1a8015edaa711b5445b98e8213
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites utilizing formcraft or super-forms plugins for file uploads. These links are likely intended to lure users to malicious or phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://pistant.ru/uplcv?utm_term=track+laying+equipment PDF link annotation
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a662bb9dc07---gazavidik.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/pizojamunamaxazutam.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c31bcb17a2---50768619225.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/bhca3aoh5llc7k3ekp5pcakluk/28927094263.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/rk1q5kncb5pv1mhujo5a0esaps/pirasawidulilak.pdfIn PDF document text
    • http://classtool.info/upload/files/povironuvufidez.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/69078011500.pdfIn PDF document text
    • http://www.euro-fly.eu/userfiles/files/35803990348.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/htk06291f430vusicsku375rfu/fapevajuzebonugew.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/gutisir.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/ac6967efceffc0cc2bd6272a57fdcd73/40978952474.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210619194756151.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/mumalasanadodexefepaver.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160a871a9073c9---filumewowitagifesibubi.pdfIn PDF document text
    • https://eventaipei.com/upload/files/mewonewosipedotifigi.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/punebi.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/sivetogifaluxa.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/59964440759f2cdfc8baa97022cf889b/52241522129.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607650d6b87d0---gomuk.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16078dfca0d896---79007273844.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/8jcump2jhablnjahi32911gbok/93429529141.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/14669984800.pdfIn PDF document text
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/abd87f82c6d8413f82e5c1cf730b7a07/22002288321.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/8eff6d94d5e68316d53feb9a10165ee2/dumavozodusudafexeziwiv.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_off0000f80d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11024 10844 bytes
SHA-256: 6c49b357d78ae1197adff4dfa6a0e86c39464aa6d2e86428acdfd477b21059e1
font_02_sfnt_off000128d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128D7 17284 bytes
SHA-256: b27843b8647524ea37fa66da34ad7621b91e37ee8585e7fdc4293fe5a5c5c8de

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