Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b4a6f6bd5fbc16f…

MALICIOUS

PDF

82.0 KB Created: 2021-09-19 01:54:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: efa2f1d4c657ad3d5c0c7eb188fc0986 SHA-1: 66cdbb4bd1ccb59464618512a1d7242be58ab654 SHA-256: 5b4a6f6bd5fbc16fa1ee10d5d77844594c7d4034d45d1074a858406ea36c071b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs that point to a variety of websites, many of which appear to be part of a link farm designed to obscure the ultimate destination. Several URLs lead to compromised WordPress upload directories or disposable hosting, indicating a likely phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crysiq.ru/uplcv?utm_term=newly+installed+app+not+showing+on+android PDF link annotation
    • http://www.beverburcht.nl/upload/files/26162171424.pdfIn PDF document text
    • http://iseveranscopy.com/upload/editor/file/56214970243.pdfIn PDF document text
    • https://www.truckersplantparts.co.uk/ckfinder/userfiles/files/34257527107.pdfIn PDF document text
    • http://arrhythmiaclinic.com/userfiles/file/20210910150038.pdfIn PDF document text
    • http://caythuocnam.org/images/files/gopulawa.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/e1b157748e7b8fbf63c4f70c2749357a/safupikuzovan.pdfIn PDF document text
    • http://flex-link.cn/uploadfiles/files/wusonav.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/98380549489.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/35119775417.pdfIn PDF document text
    • http://alpinedelhi.com/userfiles/files/18374888821.pdfIn PDF document text
    • https://www.tamilsaga.com/ckfinder/userfiles/files/35344635339.pdfIn PDF document text
    • http://fabriziocar.it/userfiles/files/72214768711.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161416eb9b2303---43239758517.pdfIn PDF document text
    • https://hebatkeren88.com/contents/files/92879960726.pdfIn PDF document text
    • http://demo-jesma.shopcloud.es/ckfinder/userfiles/files/93553776196.pdfIn PDF document text
    • http://gaestehaus-am-erlkoenig.de/img/editor/file/rozoguwipapofuj.pdfIn PDF document text
    • https://kar360.com/resimler/files/93513870680.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/09ca867485cd75b6af14a4878151dfc3/jimofenel.pdfIn PDF document text
    • http://eamenfaraz.com/cache/fck_files/file/40204769671.pdfIn PDF document text
    • http://reichspfarrer.sk/file/48162368963.pdfIn PDF document text
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/2fedfb65739c74746cad456812678008/17184464755.pdfIn PDF document text
    • https://viveironativodevicosa.com.br/ckfinder/userfiles/files/gadidovulepameze.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/18667876322.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/25851749605.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_off0000dcc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC8 10848 bytes
SHA-256: 451e6aec34e5f139af02817386c3afde0cfe9ec0a3bf464caa46b3d6bb171b42
font_01_sfnt_off0000f59d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59D 17084 bytes
SHA-256: f4c03e4d6f700c1f5e508bf62f2b377caef3af81b46dbceb1693344e4edf1a7c
font_02_sfnt_off000121b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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