Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0fc79aeaec4d468…

MALICIOUS

PDF

83.9 KB Created: 2021-09-11 06:13:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bc12c5ac5ffc91fa4f52ff6b30277922 SHA-1: d91d28ef657825361e8b9d61341621ff88bb1b06 SHA-256: e0fc79aeaec4d4688d8decd5bd7bf7ac5a4cfa183c0e75d29ff3850169e25947
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised or disposable domains, indicating a link farm designed to distribute malicious content or phish users. 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 0.9977

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 http://altiro.nl/home/tjerk/file/86918383982.pdf In PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/55660839431.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/94071589200.pdfIn PDF document text
    • http://myoffice2561.sesao33.net/UserFiles/File/8856135134.pdfIn PDF document text
    • https://asi-filter.pl/files/file/juvukenixurosodotininalu.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/161340f3720dae---zadokixad.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/kagulurubozisal.pdfIn PDF document text
    • http://uzmansporzeminkaplama.com/resimler/files/78970519631.pdfIn PDF document text
    • https://gilbertems.com/videos/file/26315118483.pdfIn PDF document text
    • https://glaskunstcentrum.nl/images/file/nidunutufumoxor.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/nabudenobunanu.pdfIn PDF document text
    • http://ministerium.pt/files/kurivowavux.pdfIn PDF document text
    • http://thienminhgroup.com/uploads/userfiles/file/liwogovuritaka.pdfIn PDF document text
    • http://impressivetravelvietnam.com/upload/files/susodufuta.pdfIn PDF document text
    • http://mousike.it/img_ins/files/kujajamuxane.pdfIn PDF document text
    • http://nocleginaplus.pl/uploads/userfiles/files/91934499956.pdfIn PDF document text
    • http://hoanhaochemical.com/uploads/files/rifonunupu.pdfIn PDF document text
    • http://kipia-nn.ru/userfiles/file/runotawefitopuwutixib.pdfIn PDF document text
    • http://xn--2e0b95unoa536adofm5h.com/userfiles/file/forikuwuge.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161382b44ce832---nupakenuxofabodelojabok.pdfIn PDF document text
    • http://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sagoxatikixu.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1b6ee03c2---75364697962.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/pigowiwupobut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=dragon+city+maze+coin+hackPDF 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_off0000dd3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD3C 19104 bytes
SHA-256: 8677e05219c24c15558a046c92799260e551ce12acc4a01c7c6279e20dd9b6dd
font_01_sfnt_off00010f90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F90 10728 bytes
SHA-256: 0de406fe12a5aa84689f89012d361a536f7b1217f8879d908835439fa6b1a4bf
font_02_sfnt_off00012816.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12816 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1