Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b6e6d88c053c5f7…

MALICIOUS

PDF

77.1 KB Created: 2021-05-25 14:57:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 677894c42d4c0817c6c8dc24513b7396 SHA-1: 6f2be72f43fdf43f2c0350e29d4f4b45a7a6a09b SHA-256: 6b6e6d88c053c5f7d16dfc449ca2929096a3b4b9eaeaa406c94d73de2bf3c9b1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to compromised WordPress sites, acting as a link farm to distribute files. The embedded text and URLs suggest a lure related to downloading 'Geometry Dash Subzero 2.2', likely a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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=geometry+dash+subzero+2.2+download+pc
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/02f610257240d7d4defc79658bdc071b/10126688989.pdf
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160855d1b0d47a---pelukizojolapugikabovezok.pdf
    • http://ainut.fi/userfiles/file/niniso.pdf
    • http://czdashan.cn/uploadfile/file/2021051512454773499.pdf
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/210b949d90fbddf976452e83e767e1bf/18222199331.pdf
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607914db14046---46569072198.pdf
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a4ff6ab530---40281477966.pdf
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/56ab97d1e105d905b949dfcf9457be14/43016362992.pdf
    • https://festival.bg/fckeditorfiles/file/26183524652.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/s0ka648vklv1ma170nhlhhrtp7/ninogowa.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/libqvr0r4eqjomdnbesoikk4te/dukewejuv.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5fd8d0cba---kuvepivopoji.pdf
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/f79m75l4e2i112046p6l2rknq2/86813529030.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084d2f859a34---bavijawedepuragazivun.pdf
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606f389e26c5b---65121133651.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3f0.bin
82c6a10b4286decb3a985efaee27a7f36fc5f6b4bfa9e075930be10fcd640512		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F0 5724 bytes
font_01_sfnt_off0000e76e.bin
36754377feea264c75d22e6c00ce6a9fafed1e23b72a23a767cdab189f96349d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE76E 21924 bytes
font_02_sfnt_off000117bd.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x117BD 4324 bytes

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