Malicious PDF — malware analysis report

Static analysis result for SHA-256 edf5f63ae6d84069…

MALICIOUS

PDF

70.7 KB Created: 2021-09-18 13:18:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 4edd62bc49722017a089d328df8cf00a SHA-1: 66d3995ac6c26c239816c6f6a43e57f7ae20bb7b SHA-256: edf5f63ae6d84069e4ea1f9d7c16d5044e7f16123443ad800a7302f45326da87
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple domains, some of which are hosted on compromised WordPress sites or disposable hosting, suggesting an attempt to redirect users to malicious content or downloads. The presence of external URIs and link farms indicates a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://oniceh.ru/uplcv?utm_term=imo+lite+download+for+android PDF link annotation
    • http://www.gc-antey.ru/ckfinder/userfiles/files/nimijodanirixaxudeli.pdfIn PDF document text
    • http://egitara.com/upfiles/files/45412290210.pdfIn PDF document text
    • https://fsreloading.com/userfiles/files/33324466219.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613f02cd71d7d---kazimimepemakulubajali.pdfIn PDF document text
    • https://euforbiabulgaria.gbinvest.net/uploads/pages/files/6055161327.pdfIn PDF document text
    • http://abwfinlay.com/uploads/files/nedafirugori.pdfIn PDF document text
    • https://democv.associasuite.com/imagenes/contenidos/files/7221323626.pdfIn PDF document text
    • https://ehlibeytalimleri.com/resimler/files/90208337598.pdfIn PDF document text
    • https://nordiskvillaventilation.dk/userfiles/file/sanaj.pdfIn PDF document text
    • http://nhasachconggiao.com/luutru/files/34912152078.pdfIn PDF document text
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/jukekizotelox.pdfIn PDF document text
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/aa0a6f5ff8deab2f2a5dcfc87be22e97/89589320604.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/rifababaritiba.pdfIn PDF document text
    • http://dnt-mayak.ru/content/File/84018673799.pdfIn PDF document text
    • https://ruxthai.com/ckfinder/userfiles/files/rapefepepodonofuwa.pdfIn PDF document text
    • http://kino-cosmik.ru/sadm_files/zikarusowekegefezuzew.pdfIn PDF document text
    • http://strandedtattoo.info/file/17215159670.pdfIn PDF document text
    • https://8cj2aja7-8mxb.com/contents/files/rapegowalegekilomejeru.pdfIn PDF document text
    • http://huseyindurmuslar.com/images_upload/files/dafisurugekirilozus.pdfIn PDF document text
    • http://abwsalisbury.com/uploads/files/81123766576.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161416cc0d0054---7602569894.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/gq1vt4qrilq5thpmg1mgd55b69/wosikedit.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_off0000b4cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4CD 10384 bytes
SHA-256: 688fec791fc16468f031564b6fc40cf9710decae501751424b9cac3e9c963ef7
font_01_sfnt_off0000cc42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC42 16144 bytes
SHA-256: 93e2de114de5aeb5fec1fbe887b1ebc66dd9b01a2636ad02299a22dbccd78bf4
font_02_sfnt_off0000f574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF574 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1