Malicious PDF — malware analysis report

Static analysis result for SHA-256 63458f5e9592a9b6…

MALICIOUS

PDF

81.3 KB Created: 2021-09-22 10:51:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c9d9bc83c99a3bf132b4b30d3867c741 SHA-1: 33010dfd5aa7cd7372d995ab0e6de2f71bc9b517 SHA-256: 63458f5e9592a9b62409c129803c2755826cac7bfa3676334a1838f21260ea13
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users. The presence of ClamAV detection and ML classification as malicious, along with the heuristic firing 'PDF_SEO_DISPOSABLE_LINK_FARM', strongly indicates a phishing or malware distribution attempt. The embedded URLs are likely used to host or redirect to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://irlanc.ru/uplcv?utm_term=pubg+new+version+obb+file PDF link annotation
    • http://agedwedfjtj.pretty-match.com/upload/files/niguruxi.pdfIn PDF document text
    • http://dekobonner.de/userfiles/file/riwewerobifiz.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/9fc9c4a637b5bf6eba32de796f0eb22a/67786876553.pdfIn PDF document text
    • http://rilta.net/userfiles/files/nafogafepeguraragaxig.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202109130200052776.pdfIn PDF document text
    • http://ridendo.cz/files/file/45072169614.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130632991825---zovatorarulefijuzevo.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/kotezikex.pdfIn PDF document text
    • http://miyozenemeryville.com/uploads/files/vosavuk.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/52229604062.pdfIn PDF document text
    • http://etre-belle.su/images/file/31280610578.pdfIn PDF document text
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/29964760179.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/10dcb9cfb37e3e3850e2d78acd2d9ac7/loduzezuxesi.pdfIn PDF document text
    • http://mocphatreal.com/assets/images/ckfinder/files/sofobevanijupe.pdfIn PDF document text
    • http://poltinik.ru/userfiles/file/92500337752.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/mgio4gfri83u23hjia45l0agv1/48234048237.pdfIn PDF document text
    • https://hebatkeren88.com/contents/files/fiwug.pdfIn PDF document text
    • http://vincentianssjp.com/userfiles/file/90859913360.pdfIn PDF document text
    • http://flirdining.com/uploads/files/34310907000.pdfIn PDF document text
    • https://www.andreivieru.com/ckfinder/userfiles/files/kafezemezekokaneketuziwe.pdfIn PDF document text
    • http://okna-stv.ru/userfiles/files/40531118881.pdfIn PDF document text
    • http://solis.altrodesign.eu/ckfinder/userfiles/files/88890814104.pdfIn PDF document text
    • http://winteringlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/10169753677.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_off0000db2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF341 10524 bytes
SHA-256: 3e6eeae63538eec78d2c0ff551095b05a87e18c56b53c679a38f809e9d2909c3
font_02_sfnt_off00010b5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B5C 17144 bytes
SHA-256: 44ecd3aadef56425860f68e2ea846cd1b0814e28183f925193afb29e30d2ba16