Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f19b13a5f7110e4…

MALICIOUS

PDF

83.3 KB Created: 2021-07-01 12:35:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 550b9b42c0174ed8bd3f8e513627e7e1 SHA-1: a830cab65710c8219ca196d60aaffcc90dd68044 SHA-256: 4f19b13a5f7110e4cdac7f656abc4f1e67058ecbb0f33d3b8e028debcdae1827
156 Risk Score

Malware Insights

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

The PDF file contains numerous URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lead users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the primary attack vector appears to be the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://anhbanglaw.com/userfiles/file/zulovudesiri.pdf In PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/c68d27357522ee98017493fe78c4a711/zipuritijalawisonafakimop.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160aa7832ebaa2---12777487698.pdfIn PDF document text
    • http://barcelonahotel.vn/UpLoadFile/file/29570902583.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/cce412418a18b29c8e3d1b68770529d9/nekejeburonune.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca94bae6e9c---lidogezajulet.pdfIn PDF document text
    • https://besi.co/ckfinder/userfiles/files/84302562844.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/55446755265.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/46f93f839de8d982ef4765b1679aa0fd/vufawapodudukebul.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/nepekizozofoweledaremip.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/07f64e7ff7f680262fb3f88d71792ab2/93177354409.pdfIn PDF document text
    • http://cokhiminhhien.com/media/ftp/file/manip.pdfIn PDF document text
    • http://studiotecnicobergamaschi.it/userfiles/files/70244658061.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/cd25f781090fc0b03b7163fe41c1c83f/52940576147.pdfIn PDF document text
    • http://caryhigh1987.com/clients/41333/File/31031455098.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/kesil.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/64590190276.pdfIn PDF document text
    • http://bagumul.com/file_upload/spaw_upload/file/20210509170742.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094582ec8d7e---52152699458.pdfIn PDF document text
    • https://lawina-radom.pl/files/file/wuxir.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/4dc0d18255bed898ad8c8731f1c884dc/83156324561.pdfIn PDF document text
    • http://arch-teh.com/pic/userfile/50411521436.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/79a7d069a2aed664e34b0912fdc5e527/tasupidowabudeb.pdfIn PDF document text
    • http://allseasonsart.com/uploads/fck_uploads/file/nofimubonog.pdfIn PDF document text
    • http://belgium-ex.com/images/blog//file/73128741406.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=into+the+hands+of+the+soldiers+freedom+and+chaos+in+egypt+and+the+middle+east+pdfPDF 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_off0000dd69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD69 11132 bytes
SHA-256: bb8ee76e23449fccd16fccf29e1e1c88cdf2b32ada263bef2870cde93752bcac
font_01_sfnt_off0000f701.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF701 18080 bytes
SHA-256: ccd0170a03a1a8467cbef7e1933a15388a9bfd4a2d4bed3683b184f355c0217f
font_02_sfnt_off000124c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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