Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbd5800c4ae5e663…

MALICIOUS

PDF

82.0 KB Created: 2021-09-04 20:17:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 69ef60a360f54075be293e77267a5db3 SHA-1: a3998833a7062eac3ab76f0cf974ddfe75f0f9d0 SHA-256: cbd5800c4ae5e663f23d1619c127e3f57ebde84c590c4c6ab1de80025bee89e4
156 Risk Score

Malware Insights

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

The PDF contains numerous external URLs, many hosted on compromised or disposable domains, indicating a link farm designed to redirect users. Heuristics and ML classification strongly suggest malicious intent, with ClamAV identifying it as a phishing trojan. The document body is heavily obfuscated and appears to be non-readable content, further supporting the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://coretry.ru/uplcv?utm_term=esquema+unifilar+electrico+pdf PDF link annotation
    • https://pasifikendustriyel.com/userfiles/file/lotejobipulajupudikixam.pdfIn PDF document text
    • http://przyrodnik-kujawy.eu/userfiles/file/dazexegimunus.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0a21137523---41397586721.pdfIn PDF document text
    • http://moiarchitekci.pl/pliki/file/lavotudusuluvi.pdfIn PDF document text
    • http://umrllc.com/userfiles/files/zijebiz.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/44f7e7e13737033501d6ff175d057348/lexigen.pdfIn PDF document text
    • https://www.alignerco.ca/wp-content/plugins/super-forms/uploads/php/files/22f9f15d967f727b38f95d6686399687/51350532056.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b56a8251847---66123444410.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160708c155ef99---giguropeguxowogedade.pdfIn PDF document text
    • http://tsrmvolontari.it/userfiles/files/povurerilesumefila.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/sjkns27pp21rld2a8kgapmh5uv/nivez.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/30gir7ok74qch5jf9vmtipgvg2/63724341002.pdfIn PDF document text
    • http://architettogherardi.eu/userfiles/files/tijeteredezaxapajorefi.pdfIn PDF document text
    • http://tw-echen.com/uploads/files/202108181701338994.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611bd21ab38d8---66825700853.pdfIn PDF document text
    • http://nicenpos.com/userData/board/file/dorimiximomukagezobuzesu.pdfIn PDF document text
    • http://grossfamilyreunion.com/clients/0/00/00c8ca1d7e0432e0ca4c178cf0a97985/File/koxedire.pdfIn PDF document text
    • http://rowsontw.com/shopadmin/upload/files/72628083939.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/suxipezonabupuw.pdfIn PDF document text
    • http://www.rodnolespropertymanagement.com/siteuploads/editorimg/file/resekokuvojaw.pdfIn PDF document text
    • https://idea-web.ro/app/webroot/files/userfiles/files/96029055482.pdfIn PDF document text
    • https://ruxthai-guesthouse-chiangmai.com/ckfinder/userfiles/files/77308783257.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_off0000dae3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE3 17584 bytes
SHA-256: e40e7ce6d097cb989b1863f7e1dd5cf96d5eb0c9c55ea11c16b44dbe61054c2b
font_01_sfnt_off00010778.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10778 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F8F 11008 bytes
SHA-256: 6327f1e21b23e60129bbfe797145c9ffe4c68bd4cf3fab191b2263e0921eabb9

Open this report in the interactive analyzer, or submit your own file for analysis.