Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee5576bb9a1a22fb…

MALICIOUS

PDF

83.4 KB Created: 2021-09-04 22:01:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e535d70f21621c23b0b518eccffa2927 SHA-1: fa155047ac9e457b79f2d9fb5a98fac92806b66a SHA-256: ee5576bb9a1a22fb907c9b67412886ba2af5b5c858018268a34858594b8db587
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many of which point to compromised WordPress sites, 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 distribution via these external links. No scripts were extracted, so the primary attack vector appears to be the exploitation of user trust through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/mpttf5i4ldk06ilcsbrrl0tr32/niguwanatile.pdf In PDF document text
    • http://gsmontaggi.it/userfiles/files/31190224355.pdfIn PDF document text
    • http://saothienemb.com/uploads/images/files/74684959224.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd05a02563---kowekoxutowos.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/6511d16f6a3276f1a578b2f29d4a93f1/julatafumoku.pdfIn PDF document text
    • http://sgyscom.com/upload_fck/file/2021-7-1/20210701184805143997.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/294b6a69cf09b7f87a427a2d01dd4e9d/lutusimerumosoxivo.pdfIn PDF document text
    • http://leebyunghun.kr/new/upload/board/files/satobovezafakurekot.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bad93194b8---magezixoniw.pdfIn PDF document text
    • https://cissud.eu/uploads/ck_editor/files/muxemi.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a75830a423d---4675563469.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/kopumusamefuxurabimupo.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1611473c6ad475---97063139986.pdfIn PDF document text
    • http://rancholasmonturaspremios.com/campannas/file/16080497920.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/6b130bd3f7896ebe8fca9da19db644ad/65619762103.pdfIn PDF document text
    • http://decom.pro/admin/ckfinder/userfiles/files/18172230670.pdfIn PDF document text
    • http://mirutte.com/newsfiles/files/lazufodifekuliwanasevad.pdfIn PDF document text
    • https://citronel.com/userfiles/files/wekigevikaxovoxinopalax.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/a07ccc6a1b8a340b9258bb15efdee793/renidixekizaj.pdfIn PDF document text
    • https://songhong-thudo.com/img/files/48383734702.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/vilavaburopur.pdfIn PDF document text
    • http://webhenevents.com/clients/868374/File/81823655301.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210531235930_162751892.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=subspaces+linear+algebra+examples+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_off0000dae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE0 11160 bytes
SHA-256: 74080d8e6704bc4758d53c6680187f213b8e4bd8f0a3dab33949cba0af620522
font_01_sfnt_off0000f47d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47D 19632 bytes
SHA-256: 50501398d7536d25f2a7d5190c690901ed4af74b3b891875cc16d10615866db6
font_02_sfnt_off000127e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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