Malicious PDF — malware analysis report

Static analysis result for SHA-256 a23e0a490751b4d9…

MALICIOUS

PDF

76.1 KB Created: 2021-09-09 04:29:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 2edac671667ba6b4eea93679a975d02c SHA-1: 4ed9543ad4e6068276718a5c94b77b154fe207d7 SHA-256: a23e0a490751b4d90e836a2ae0b649ed247f212d8e517e699aee89b4842bc17a
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 CMS upload storage or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://megatex.ua/images/uploads/file/2835194784.pdf In PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/3d031mitdhcmu6t23qhvo3oha9/xomiwa.pdfIn PDF document text
    • http://cosonhuath.com/hinhanh_fckeditor/file/mifiradugogidokuzalupetin.pdfIn PDF document text
    • http://csim.jp/ckeditor/uploads/files/75333578311.pdfIn PDF document text
    • http://www.impactit.in/ckfinder/userfiles/files/57772418653.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16137547ddbfb4---61923820042.pdfIn PDF document text
    • http://heryeryesil.com/resimlerfiles/vajefo.pdfIn PDF document text
    • http://flixgolf.com/ckeditor/ckfinder/userfiles/files/39734676268.pdfIn PDF document text
    • http://unite-chem.cn/upload/files/topidigi.pdfIn PDF document text
    • http://kasaitogo.com/uploads/files/gujopizunepobebipoxeno.pdfIn PDF document text
    • https://majubesar.net/contents/files/73074768060.pdfIn PDF document text
    • https://pharma-tools.pl/galeria/file/93056659721.pdfIn PDF document text
    • http://www.madiran-cruduparadis.fr/ckfinder/userfiles/files/91801150686.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16139423b50ecb---fofokixo.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/watafadejetajalobagapugim.pdfIn PDF document text
    • https://bimetoor.com/basefile/bimetoorir/files/fekofak.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16133536a51301---83006181722.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/filowe.pdfIn PDF document text
    • http://vdi.vn/userfiles/file/60785161941.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/gofodepewonumes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=download+monster+hunter+stories+androidPDF 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_off0000c77f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC77F 16700 bytes
SHA-256: 4614ac9d734415de3770297220b9de0e16f9b85846d9dc1427a8f20647d79e7e
font_01_sfnt_off0000f253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF253 10700 bytes
SHA-256: 76929b975f12d4917340baa030d7d31910f2f9493596913d177aa025962022ba
font_02_sfnt_off00010ab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1