Malicious PDF — malware analysis report

Static analysis result for SHA-256 3aabef870976704b…

MALICIOUS

PDF

88.1 KB Created: 2021-07-21 21:07:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 64528111855f36e1e75138ea32e20def SHA-1: 37287c5942124360edd37df55088466bc63cf678 SHA-256: 3aabef870976704b850b90e84884b4a63cdf3d2c500ef49e647b17a68ea4f1e1
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The file contains a link farm pointing to numerous domains, many of which are likely compromised or disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of external URIs and a link farm indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dzbnf.com/upload/file///kuzunun.pdf In PDF document text
    • http://abwmechanicsville.com/uploads/files/87251523314.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/43446344691.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/a567f597bdddb945ce415dc5d6352617/24441266258.pdfIn PDF document text
    • http://sicilyontable.it/userfiles/files/salemuduvewavovadajokizob.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/nogizizatakusamifotojetaw.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16082829958306---subewibomolug.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b9875cc08b5---nipogokozitiditoru.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/hs3ru547h667jl2fkq39rknevi/11744110716.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/22113937415.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ed925e574---76208464703.pdfIn PDF document text
    • http://3gr-group.com/ci/userfiles/files/mobogiburixasadirinaj.pdfIn PDF document text
    • http://csc0535.com/userfiles/file/20210709135033_j2bgpd.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/wutibuvop.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/288g0obpl33847j7dmvkpqfbkl/66975733921.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9fb917920---kuvetiwijigo.pdfIn PDF document text
    • http://bamila.vn/luutru/files/30682094897.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/292b1a598474f3924b2988a83e6bd8a8/3992424976.pdfIn PDF document text
    • https://www.kcequipment.com.au/wp-content/plugins/super-forms/uploads/php/files/ded87e441d37eb4445ee086d14436cd7/magamazobebubitojufimaz.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9b60cf5917cf95a0dc34fd7d0aaebd75/sudegopenifisupotuk.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210708083134.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/podejonim.pdfIn PDF document text
    • http://nhatngungoisaoxanh.com/upload/files/46411077838.pdfIn PDF document text
    • https://blokhol.com/upload/files/gaperinunomu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+save+multiple+photos+as+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_off0000f0fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001090c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1090C 18276 bytes
SHA-256: a66293cd4b2c7c8ce831152841ca26761d847d7701f6ef0eb051dcd6c5020852
font_02_sfnt_off00013959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13959 10804 bytes
SHA-256: ae1b144df60cb523b2825b1f46511a9ae76fc5b329e9f96b1e2e6494abaf90b8

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