Malicious PDF — malware analysis report

Static analysis result for SHA-256 584bbf74c9f04056…

MALICIOUS

PDF

71.4 KB Created: 2021-09-25 17:12:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 2a92b257193f0d69a56c838fb58c1ae6 SHA-1: cb43cf57ba8da3bfbe730d32b505f5e4b58296a8 SHA-256: 584bbf74c9f04056613ce9f5c8bf5e83277afe9d92c9f08babb6c80345af64f8
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. The presence of 'utm_term' parameters in some URLs further supports the idea of tracking user engagement with these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://wastran.ru/uplcv?utm_term=magneto+quicksilver+scarlet+witch PDF link annotation
    • http://francescofesta.it/userfiles/files/delemenolalezanufego.pdfIn PDF document text
    • https://www.ruchya.com.tw/upload/files/rofafawizogur.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16147cd8ea50d3---majutexusowibapamezixol.pdfIn PDF document text
    • http://thegioioto.store/upload/files/kuxomubujinafu.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/59340548829.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/luzifafuzekekofotuxof.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/xuxaximaso.pdfIn PDF document text
    • http://thegioimaychaybo.com/app/webroot/uploads/files/20588691350.pdfIn PDF document text
    • https://asmitahrgroup.com/ckfinder/userfiles/files/61008909708.pdfIn PDF document text
    • https://anbuadidravidarmatrimony.com/ckfinder/userfiles/files/23503819290.pdfIn PDF document text
    • http://www.sm.ac.th/ckfinder/userfiles/files/81845907924.pdfIn PDF document text
    • https://smartech.lv/sites/smartech/uploads/documents/files/34608328055.pdfIn PDF document text
    • https://tunhuaduytan.com/upload/userfiles/files/xarunenodenowu.pdfIn PDF document text
    • http://yusungchart.com/userData/board/file/naluneresovofiz.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/lerovefopujizagonu.pdfIn PDF document text
    • http://huspanda.com/data/ckfinder/files/baxazarakuxodezapigirate.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/65702073613.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/16134a49ccf847---71658273302.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/zumujomaradel.pdfIn PDF document text
    • http://k1a.ru/images/files/file/86414282484.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/7d18744d87946c44aa3ceedc8d7865ac/fekebubom.pdfIn PDF document text
    • http://kleinschadenexperte.com/userfiles/file/79364528389.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/fizefenuzipijiwekiw.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/motinamolifiz.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/72475434542.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_off0000b2a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2A5 18016 bytes
SHA-256: d6849afb8b6f27231c9e43b8bc9a11ae9ebaff0d8b441c3975c33034ae4dde8e
font_01_sfnt_off0000debd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f6d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D4 10992 bytes
SHA-256: 2a115d7dbf9aa68e2acedfee70b10136f2c56bec2bd32f0ef3e3982438301601