Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ed2cf6479f88731…

MALICIOUS

PDF

73.4 KB Created: 2021-09-11 21:55:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8ebff4f2a9144957ad8be91fb1cf62af SHA-1: 4367c121bc0a8ef5afeb4a7dec08a1df21edfbbf SHA-256: 1ed2cf6479f88731f9c86a444a24df936cb8fb2d1d2c57ca84a57b61113e5c1e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to other PDF files hosted on various domains, some of which appear to be compromised WordPress sites. This structure is characteristic of a link farm designed to distribute malicious content or phish for credentials. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nomylo.ru/uplcv?utm_term=old+man+and+the+sea+project+pdf PDF link annotation
    • http://wellnesszeewolde.nl/site/data/ws/files/pabuxafob.pdfIn PDF document text
    • http://precisao.org/files/files/kosopazimubevod.pdfIn PDF document text
    • http://nineslash.com/user_file/file/xasodakefujobuzusaronukik.pdfIn PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/79821833625.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-9-9/20210909170302824075.pdfIn PDF document text
    • http://hud101.vn/webroot/img/posts/files/worenavomudoketatejis.pdfIn PDF document text
    • http://pickup-ws.com/userfiles/files/samivokalisusotili.pdfIn PDF document text
    • https://mraos.com/web/userfiles/file/95307036001.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/161309d038780c---16248193257.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130d3ed11bf6---zogoroxosutofor.pdfIn PDF document text
    • https://cuatudongsaigon.net/uploads/files/68163010346.pdfIn PDF document text
    • http://immobilieninvestors.org/userfiles/file/viwokesijupasederiw.pdfIn PDF document text
    • http://greenbrier101.com/userimages/boxubunafeleworalid.pdfIn PDF document text
    • http://ortopediaszombathely.hu/editor_up/vexoripo.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/nirulofemob.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/161336cc91f2f4---86527941863.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bcad9e9d10---dulogufilegekeweki.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/likevuxumikawobenu.pdfIn PDF document text
    • https://ispartaorganizasyon.com/ckfinder/upload/files/18323982092.pdfIn PDF document text
    • http://bualuang101.com/backoffice/upload/files/93271802973.pdfIn PDF document text
    • http://tantex.org/tantex/tantexuserfiles/file/mowotukeboruzafazurirabam.pdfIn PDF document text
    • http://baharev76.ru/userfiles/file/vibutakide.pdfIn PDF document text
    • http://dichvutheapec.com/upload/FCK/file/xolidagategazo.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_off0000bc56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD468 16552 bytes
SHA-256: 9e18ff8812532feed3a8f14c4d080fdac727904057cee83e53baffaeafa3a8cf
font_02_sfnt_off0000fe8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8B 10948 bytes
SHA-256: 02deff4b16d7f47fb05318748d5f86e691da58835e0e604b750165d4811d1351