Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8bbb20db51a86cd…

MALICIOUS

PDF

85.4 KB Created: 2021-09-02 23:00:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 29728d92545d5c5140fcb22a122a5347 SHA-1: 6ff06a62ff701b433eca2cd56fe4f9ede049510b SHA-256: f8bbb20db51a86cdac2f7fe8a6dff12716477108110f67a9d77c84816dec29bb
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO abuse. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://catamma.ru/uplcv?utm_term=grade+1+picture+comprehension+worksheets PDF link annotation
    • http://avsa.org/sites/default/files/images/files/kekesogagilokunulibuvu.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/276f998b4b7284054720da2269aa2a86/towokezijudoxobumijilopav.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160836642d785f---fisemuvi.pdfIn PDF document text
    • http://hotelamadeustorino.com/userfiles/files/rodivewamugukisip.pdfIn PDF document text
    • http://music-summer-courses.eu/upload/files/derigivufilikagid.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/suwumurexewam.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/91496583214.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/33401285555.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607682ab6c28b---74065692647.pdfIn PDF document text
    • http://armanetti.com/images/20291010486.pdfIn PDF document text
    • http://lysfyyy.com/upload/files/12945963602.pdfIn PDF document text
    • http://teifsepahan.com/files/file/virulokebaxuganajefup.pdfIn PDF document text
    • http://tdbakademi.org/userfiles/files/44014746688.pdfIn PDF document text
    • https://recrut.com/files/files/buruvomowupuruwojodow.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e5e669bdde---zilezisixit.pdfIn PDF document text
    • http://naphotelbangkok.com/userfiles/files/fezoluve.pdfIn PDF document text
    • http://poultech.net/d/files/3949975159.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/ad2214f54ef267be2cc77920b2050982/buvomopizukepis.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///87928589270.pdfIn PDF document text
    • http://gsmontaggi.it/userfiles/files/524437925.pdfIn PDF document text
    • http://mjsolankifoundation.com/fck/imagesfile/kedogipaterawed.pdfIn PDF document text
    • http://vinhthuan.vn/upload/files/vajuzupitutiz.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/31721813683.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/22490369456.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/1bbb65b45ae71bc2f2da6e21b02a1269/zomokivivovisegu.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ed22b1772---jixeper.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_off0000e4c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C7 18784 bytes
SHA-256: 737d10c9acfdc7307b205d3f64f237fd5309808d8be60fcdb011622ca7a78235
font_01_sfnt_off00011578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11578 11104 bytes
SHA-256: 87c77a9fa25940c54c17450de9db19346b9d729907f57dacb3f2b22f7aa06e7e
font_02_sfnt_off00012f50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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