Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ffeb4ae9c466a2d…

MALICIOUS

PDF

77.7 KB Created: 2021-06-07 06:01:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 25781663ee35247f9e9371e31feee377 SHA-1: f0fe6edd5f4ca0829c4fbe9ccef6493d7448b33b SHA-256: 1ffeb4ae9c466a2dfea7fe797dca5aaeaef19ec8bafcb090168d2099b179755f
164 Risk Score

Malware Insights

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

The PDF file contains embedded links pointing to compromised WordPress sites, suggesting it is part of a phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a secondary payload or redirect users to a malicious site. The document body, though obfuscated, contains keywords related to a health issue, likely a lure to encourage clicks on the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://chcial.ru/uplcv?utm_term=how+to+recover+pulled+groin+muscle PDF link annotation
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160716b4ee9bf4---subujilabuxegose.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607b11e8039b4---46834368638.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e611a3225---42487701183.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/a41314205ee5c612600a3267821bcfda/pizemoxafunolibulakuxaniz.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/tewubedenulofevifex.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/lisupoeaqk3d76j389th8n30l0/xidada.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160823fe4a20db---53575044772.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/vobanefevodoxurikit.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/7fc7b38ae2d3b6ae4d453c4fc9075e95/5004185085.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/nuwune.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/471ea0f84e88846f0bc6d2eb60ef5416/dobesebiwobarene.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/02e4d97736c24463ec7f808ea9cc9457/zajiroruro.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/36ac1da4feae32bf11f13e4dd16eac99/torinopujaredus.pdfIn PDF document text
    • https://lionkingbali.com/uploads/file/lapozixusojigejis.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a4052b901b2---dozaxasapaf.pdfIn PDF document text
    • https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/nup0dog5kf2l0nkq9jio5kai73/wuxufobisimababepegil.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/3bb5k9pued4mpofrtl1vdr1ha1/91170082005.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF242 5296 bytes
SHA-256: 4e70a599801b2ce822a445d119a498961ab9069b4e4c793f052a65c685c11ef8
font_01_sfnt_off0001044e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1044E 10404 bytes
SHA-256: 0682f64435267366f14f865843f9d09a774613fa579fdc7df57767efd431aaf0

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