Malicious PDF — malware analysis report

Static analysis result for SHA-256 a95add02fb612b76…

MALICIOUS

PDF

78.9 KB Created: 2021-09-24 01:08:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 615c646e66dfe0d5379a47295efe0934 SHA-1: 8350ffb4c7afba969add259012a343cd267f5bcf SHA-256: a95add02fb612b76e4db3209069e04802345b3dd9ffcedb222358e4152d8e3a5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farm heuristics, indicating its primary purpose is to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document, possibly leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://chcial.ru/uplcv?utm_term=de+amor+no+se+muere+pdf PDF link annotation
    • http://ckudzcssffhhj.handysociality.com/upload/files/tiladeke.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/f59e7130c9baec99d3a03f8fb09d6d8e/28633573966.pdfIn PDF document text
    • https://adian.eus/files/galeria/files/nowolawipapegorenogunap.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1614ce5a511fc1---lebabagumaguzezesewejeva.pdfIn PDF document text
    • https://support-trevianum.nl/userfiles/files/fanisolelekerala.pdfIn PDF document text
    • http://seanmore.com/userData/board/file/rukelifaf.pdfIn PDF document text
    • http://xn--3e0b556bhrbowi6undva.com/ckupload/files/zadazuravugububejilavod.pdfIn PDF document text
    • https://kuni.ro/app/webroot/files/userfiles/files/jumobu.pdfIn PDF document text
    • https://emotionalgift.com/ckfinder/userfiles/files/69477715399.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613385f8b4837---jadaxozabenom.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/bedarifob.pdfIn PDF document text
    • http://mytrangroup.com/uploads/userfiles/file/jufesibimesalifus.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/16147c1790c8b2---7547522522.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/161329a5d693fa---85329706278.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/cec7e0b95ddc3d3855cfc19ba414a6d8/wisukorapi.pdfIn PDF document text
    • https://tramhuonghanoi.vn/upload/files/durojolewasidokeriz.pdfIn PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/rosotepoguk.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351c59b7a23---pizeviranabokix.pdfIn PDF document text
    • https://simon-daulte.com/ckfinder/userfiles/files/punukav.pdfIn PDF document text
    • http://parfumland.sk/upl/11077856022.pdfIn PDF document text
    • http://aygroupmuh.com/image/files/32066629859.pdfIn PDF document text
    • http://vietnam-intraco.com/webroot/img/files/zugotubawifuxawose.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-9-23/20210923101711683353.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_off0000cbbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBBE 19404 bytes
SHA-256: 50f7bc5dea7adda5ac560127bfc78ca18fc12c7c0e6d033916f399cfcbcb57bc
font_01_sfnt_off0000fdcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E6 10524 bytes
SHA-256: 9172c431a527ef3090101a7c72ee7cb674924316dd28952f72b96bed42706ee6

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