Malicious PDF — malware analysis report

Static analysis result for SHA-256 c64ea3f7f20f29a6…

MALICIOUS

PDF

79.5 KB Created: 2021-10-12 20:48:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a835efc2de63e7321356d870ff96afd4 SHA-1: e42fed1f4f82eda6760d5d700425ddefbbcef939 SHA-256: c64ea3f7f20f29a642d4d64fb9fa12db61cc8e1beb06378812a649902f32182f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, pointing to numerous external URLs, many hosted on compromised or disposable domains. While no scripts were explicitly extracted, the nature of link farms in PDFs often involves JavaScript to facilitate redirection, suggesting an attempt to lure users to phishing or malware-hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 http://fairbank-ia.org/admin/ckfinder/userfiles/files/50948650399.pdf In PDF document text
    • http://mycoapaisyl.com/webimages/files/37201632809.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/9038509479.pdfIn PDF document text
    • http://eamenfaraz.com/cache/fck_files/file/sepusegefobabupomegebe.pdfIn PDF document text
    • https://10s317.com/uploads/files/202110030842105943.pdfIn PDF document text
    • https://vroa.pl/chplusfiles/file/davabokewoxinabu.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16131c50925fc4---zijevovanemomarebevej.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161436ef39f2e5---lolaj.pdfIn PDF document text
    • https://ckeditor.pamlskovnik.cz/ckfinder/userfiles/files/50283119035.pdfIn PDF document text
    • https://doxity.ro/ckfinder/userfiles/files/54207074305.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615a47ad5e417---62470294641.pdfIn PDF document text
    • http://architettogherardi.eu/userfiles/files/95291502836.pdfIn PDF document text
    • http://iwayman.com/uploadfiles/file/210922070143039065ex18zp.pdfIn PDF document text
    • http://novichiha.ru/pic/file/galejogidala.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/1630910811gudiritorufuvadasusiro.pdfIn PDF document text
    • https://standsimulator.com/ckfinder/userfiles/files/62886861048.pdfIn PDF document text
    • https://www.sistemkabin.com/ckfinder/userfiles/files/87112664249.pdfIn PDF document text
    • https://ateliersmq.com/pevron/www/img/file/rejaridurikuvat.pdfIn PDF document text
    • http://studiosiriosrl.it/userfiles/files/29773091216.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/6a54c8cdf3694755fa4903a6519a5000/22016982960.pdfIn PDF document text
    • http://www.alliance-bio.com/user_data/editor/ckfinder/core/connector/php/upload/files/zufejizawozetagis.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613df1d70101f---gifasafunezopoki.pdfIn PDF document text
    • https://daotaolaixesontay.com/uploads/file/lutizadosevegofatokumol.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1614ed45508b40---92822727443.pdfIn PDF document text
    • http://annabarons.com/files/files/65378393964.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/23D8k0Ec_6w/uplcv?utm_term=transforming+exponential+functionsPDF 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_off0000ceda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEDA 18272 bytes
SHA-256: 1546b730f9756b734662b912b19b093c854dc7dd36dd88bdbbdd5a714f5be73e
font_01_sfnt_off0000feab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEAB 10988 bytes
SHA-256: 01f9c6c0114e9326e7c9a5b86529536a539f3ef83686a9d77a4d0e9543d6a23c
font_02_sfnt_off0001183b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1183B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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