Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d5ecd0dd82eec00…

MALICIOUS

PDF

74.9 KB Created: 2021-08-28 02:11:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2bf22ff0ad07d14bbd7fc8c5c6c58a0a SHA-1: c452385dbc55c22be61990b1b19ce346bd2dbc1c SHA-256: 7d5ecd0dd82eec007db0d742517303e4aacbeee89bab355d6a77f3473a5b17dc
196 Risk Score

Malware Insights

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

The sample is a PDF document that employs a social engineering lure, instructing the user to install a browser extension or update to view content. This is a common tactic for credential theft or malware installation. The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution campaign. While no scripts were directly extracted, the nature of the lure and the embedded URLs indicate a high likelihood of malicious intent, potentially involving JavaScript execution for payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://queure.ru/uplcv?utm_term=mouse+mover+mac PDF link annotation
    • https://masini-de-ambalat.ro/images/userfiles/revemetipizixo.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/nijunopilubun.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/berutowixitelifilubobo.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/f8c6324181e567b7b855c088de843b3f/122702528.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b283ef1ff---limepipefinowewepupolo.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/b5e489b794fc35b8782b76e9949e55de/68432202629.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3628e25a8b---zejutizerowebubewakekusaz.pdfIn PDF document text
    • http://hrudolf.com/userfiles/15041092055.pdfIn PDF document text
    • http://qytbearing.com/upfile/file/belogemixamukixe.pdfIn PDF document text
    • http://tradeweb.es/userfiles/file/61257496138.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d41519bd8a---99798944137.pdfIn PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/4b2c013764f50975d7721e6f593e7815/78060202070.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16082a68432c79---xulegagerire.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-7-25/20210725174441666153.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/26920099046.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c08e5e70afc---vujawewarukameluwomeza.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/4naiqpev5vgkab0qn5o4qev0pn/saseze.pdfIn PDF document text
    • https://lidiyageorgieva.com/ckfinder/userfiles/files/pefozexevamizetuxe.pdfIn PDF document text
    • http://skidubravy.sk/spravca/ckfinder/userfiles/files/wiruzibepuxepubojakivogu.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a53f0aa9d6b---funinafepigev.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d578bad4c21---bepekefax.pdfIn PDF document text
    • http://porpora.info/imagenes/imagenes_contenidos///marafadol.pdfIn PDF document text
    • https://guruamardaspublicschool.com/userfiles/files/85594132574.pdfIn PDF document text
    • http://sibinetweek.ru/userfiles/file/80847446960.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/fanamuvorativasosepewak.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/0mra8l39pijj2vvltfnr1mlpa5/88727014204.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_off0000c43f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC43F 16552 bytes
SHA-256: c6fdd772c38d953e04d78241656d95920f0a2de6d51a3a6b35710e5fb3ee3003
font_01_sfnt_off0000ef4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10764 10212 bytes
SHA-256: 90183c68a39cc3f5bb59455eeff6915c39031f214f1bb665c8e11f4709dfa182

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