Malicious PDF — malware analysis report

Static analysis result for SHA-256 4722e7fc8b4eb92e…

MALICIOUS

PDF

77.6 KB Created: 2021-09-12 15:58:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a76f319c9c0c13aa57e7daedb1720e81 SHA-1: 25848d0f1c8fb123c0434a92f05b64b3777cab9a SHA-256: 4722e7fc8b4eb92e019ef07b2570787411ffd2961b466e292ac554a92ba04c2b
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery through these links. The document body is unreadable, but the link farm behavior is a clear indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://yuemeism.com/uploadfiles/files/67091530676.pdf In PDF document text
    • https://visualarchive.bg/files/kinonotiledaliw.pdfIn PDF document text
    • https://matfplayer.com/calisma2/files/uploads/79837487878.pdfIn PDF document text
    • http://artc-polymers.com/upload/images/files/bibatafexide.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/88828768528.pdfIn PDF document text
    • http://xycrusher.com/d/files/97899861800.pdfIn PDF document text
    • https://tiemhoahaibara.com/data/dulieu/files/jezelexekutuborenobifilen.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0687d27c4---9482399584.pdfIn PDF document text
    • https://serviceelectric.ca/userfiles/file/zikudazizuzilulejav.pdfIn PDF document text
    • https://kuni.ro/app/webroot/files/userfiles/files/84943244312.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/futaroluvubiporetepat.pdfIn PDF document text
    • http://odesignlab.ru/admin/ckfinder/userfiles/files/zevimix.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16139c6686d87e---74852119503.pdfIn PDF document text
    • http://gyliver.ru/files/files/49667439430.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0dac986d6---74058522759.pdfIn PDF document text
    • http://www.alcera.ca/userfiles/file/29622990375.pdfIn PDF document text
    • http://bangladeshceramicsociety.com/uploads/editor/files/nizizavubaxolumata.pdfIn PDF document text
    • https://happy-playground.gr/uploads/_uploads/files/97051382751.pdfIn PDF document text
    • https://vientangluc.com/upload/files/69943414057.pdfIn PDF document text
    • http://autovoda.ru/upload/files/mizuneduzevidateramaru.pdfIn PDF document text
    • http://trevelci.ru/ckfinder/userfiles/files/tezenubigikojobunapafo.pdfIn PDF document text
    • http://toyotacri.com/userfiles/files/geduposawopupat.pdfIn PDF document text
    • http://anpo.vn/upload/files/dugud.pdfIn PDF document text
    • http://satcomlink.com/userData/board/file/zitedawebafunagumalagabi.pdfIn PDF document text
    • https://derechosenred.org/aym_image/files/jobanefiwoganojezi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+rotate+pdf+file+and+save+itPDF 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_off0000cd07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD07 10632 bytes
SHA-256: 886582270a20067c67ab7ac21322220727b5476f6e0b18242d2f3d9714325110
font_01_sfnt_off0000e572.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE572 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD84 16692 bytes
SHA-256: a82b998e066aa2fc5529c0131358e89fde861a26122f4104885022a5c77effd1