Malicious PDF — malware analysis report

Static analysis result for SHA-256 b07c7c29dd013082…

MALICIOUS

PDF

80.1 KB Created: 2021-09-05 08:49:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 06bfe2b7f27bb15656e3381ba54ea5ba SHA-1: 1312f3d0c6ecaeefcaa9d033b00c8c1b650be957 SHA-256: b07c7c29dd013082bb2ae8a9566662adcfd8704acd7b492f5b9b7d11fb03ccc2
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous websites, many of which are hosted on compromised or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristic firings and numerous unknown reputation URLs suggest a malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://whatproperty.ng/ckfinder/userfiles/files/xaragopexewut.pdf In PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609f6dae2a3ed---1929356454.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/zefizavogomodebix.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/32677202810.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/hqlmaljnb5rtds5hkic0l9bhvn/tezunekubetopuna.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210516155256070.pdfIn PDF document text
    • https://fitness-sport.it/userfiles/file/36123702635.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/9d940e4ba8576941e569dcafc551d97a/kuwaxuruxukakesefumivino.pdfIn PDF document text
    • http://doggystylzgrooming.com/admin/photos/file/marubogokixavok.pdfIn PDF document text
    • https://partnermind.cz/images/files/ditatogagugibifokatugilod.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/vuraf.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/16090a9e5a62ea---74969755603.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/0sjsro833iodmuljvjj3cm3p8e/17461617724.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/dc30ad21ee3894b23e268d2e20c06733/siwujukozuxiluri.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/vokekuni.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/4f9da4a36e8e2777f361b5fe4521bf44/sedoxelukomijorun.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c11996cdac5---lojezotu.pdfIn PDF document text
    • http://www.oiseaubleu-promo.fr/userfiles/file/80865420158.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210824112453.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160991ff0034a7---74010188291.pdfIn PDF document text
    • http://adveotec.com/img/file/25359029430.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/xiporuwakaworejulodudi.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/16093092ea610e---zoravajiros.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=escala+de+braden+2018+pdfPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF60 10928 bytes
SHA-256: 055f54288048fe87ecf65d358ae12e9e3cd8065855cc1295652a8a2a7ca4f921
font_01_sfnt_off0000e8a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A5 19624 bytes
SHA-256: 4669f20f3da91ec6b2e8c3743b36e5cb9c6e1081027007b0e022d37ac3d3d3a5
font_02_sfnt_off00011a8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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