Malicious PDF — malware analysis report

Static analysis result for SHA-256 a228556de23aba21…

MALICIOUS

PDF

79.4 KB Created: 2021-09-21 15:51:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 888f1ff188a30e03ed7ecf44e3abf428 SHA-1: 93b01e82cdde4809cfe889e5d2a1888a8bdb0dd7 SHA-256: a228556de23aba21cc24100a23574e349f72ecc1778d72a8e8d99934158c03fe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads and disposable hosting, likely to redirect users to phishing or malware sites. The document body is unreadable, suggesting it's either obfuscated or contains no user-facing text, further supporting its role as a malicious redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://archism.ru/uplcv?utm_term=watch+jurassic+world+fallen+kingdom+full+movie+online+free PDF link annotation
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/makegawig.pdfIn PDF document text
    • http://thaide.org/userfiles/file/fijapilenenedeni.pdfIn PDF document text
    • http://kuwaited.com/cote_dor_import/admin/ckfinder/userfiles/files/38119664022.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/d481fd5dd395e05ca10836b03526b79a/sowuseximebitolapenejedaz.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/kitawevoliwox.pdfIn PDF document text
    • http://autoscuolauniversale.it/userfiles/files/75000539865.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/gijowofevobabibuvosuvilos.pdfIn PDF document text
    • https://harley.dataroom.tw/upload/files/vefasisagugumis.pdfIn PDF document text
    • http://sanyosushiglendora.com/uploads/files/garojemudomelogija.pdfIn PDF document text
    • http://runo34.ru/attachments/file/nejolevapojedujesifalonov.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/zavumizidemobigalijiteki.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1614100f1a9e67---4798203278.pdfIn PDF document text
    • https://cantarefides.ro/admin/userfiles/file/mumijoxol.pdfIn PDF document text
    • http://cdkuysuujk.handysociality.com/upload/files/kupamerubukixugozam.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/tefokadez.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149aff04be2e---46400610328.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/jkrv3bvuksu5lunjmjehsm3u8j/nizamidatepiximad.pdfIn PDF document text
    • https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/xonixumaj.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/latonefupurijav.pdfIn PDF document text
    • https://graveyards-fuj.ae/userfiles/files/jadija.pdfIn PDF document text
    • http://2rent.gr/userfiles/file/gativa.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/namevoloxagubamop.pdfIn PDF document text
    • http://geometracosentino.com/userfiles/files/judaduzebex.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/ziruwoko.pdfIn PDF document text
    • http://bakefruit.com/uploads/files/202109210359142440.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_off0000cd69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD69 11388 bytes
SHA-256: ce971dc6e262b8aa453b4f60f74e64410626347d7b24ccb7ebb5f39f1c8f8301
font_01_sfnt_off0000e7ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7EA 18460 bytes
SHA-256: 3906755f122739bbb2e1823215cd508bb6686bb476c9404126703da382841d03
font_02_sfnt_off00011718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11718 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1