Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d66c4d1e74fc8e5…

MALICIOUS

PDF

66.3 KB Created: 2021-06-22 09:25:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 850afcc823a5776bf2157643d96b7fe8 SHA-1: 54bef1400e44579648a243dcf1bc6a6bf42078f7 SHA-256: 0d66c4d1e74fc8e50ac7da4d3350ab83c14df4557c97dce6d738b026fa37f9fe
156 Risk Score

Malware Insights

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

The PDF document contains numerous links to compromised WordPress sites, suggesting it is part of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, contains keywords related to 'Terraria' and 'suspicious looking eye', possibly as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ae870eda82c---68981230597.pdf
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb1c71b2313---xajuf.pdf
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/rueidijuoj5d35bu1rdmkal80f/20637499733.pdf
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073ff421cb0f---kipunorirakawilofaludew.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16080e334b37d2---15828029459.pdf
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/hm5u3gdm01hpqggjquagklgfj6/54999476969.pdf
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0fcb113eb---695071108.pdf
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16091e7f9c3348---fogapuke.pdf
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d18222e04d0---tinoxo.pdf
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/5c3311cb26882cd4702855b261aac495/36697111662.pdf
    • http://hoadon-dientu.net/images/files/zamulomijoka.pdf
    • https://adepotcustom.com/UploadFiles/file/20210430185306170.pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1609bb8c5b702e---75663209245.pdf
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/5q1bkf7nkv9pvqaee3alnaf684/66749755166.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1608593f8d2f64---92660256157.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=terraria+how+to+make+suspicious+looking+eye
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c429.bin
f274783bf1ec82750f9c459930d2bba9c7c9b8b51f9e20d35d7aa349f82fad7e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC429 5556 bytes
font_01_sfnt_off0000d6fc.bin
eee4777f915c792503221424bf7f2fb59ea593b134cae775c78c901b9ea3893b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6FC 11364 bytes

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