Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e4f267aa5fa0eff…

MALICIOUS

PDF

88.3 KB Created: 2021-09-12 19:52:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: df5ea54b555fe93f07cead6f0290c7a5 SHA-1: 3cf2be2fd4cf2c66891b1cb7bfd318cecd919cf1 SHA-256: 2e4f267aa5fa0effbc1a753abda379c3721a14995222e8812b194daf212f96e0
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains a link farm with numerous URLs pointing to various domains, many of which appear to be compromised WordPress installations or disposable hosting. The primary function seems to be redirecting users to external sites, potentially for phishing or SEO spam. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://aarogyamedico.com/userfiles/file/bezegotenobo.pdf In PDF document text
    • http://atrsara.ir/resource/files/46910784418.pdfIn PDF document text
    • http://drukarnia-skawina.pl/app/webroot/media/files/dovixofirotitumusowar.pdfIn PDF document text
    • https://maffart-guy.com/userfiles/file/nexojivimov.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/161324d1405a38---nikutir.pdfIn PDF document text
    • https://zlato-invest.cz/upload/files/tafedomikiveko.pdfIn PDF document text
    • http://studiotipaldo.com/userfiles/files/navudijo.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b15b52190d---zesunukokobitojuwap.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/85115287949.pdfIn PDF document text
    • http://studioarchoggianiepartners.it/userfiles/files/49688640284.pdfIn PDF document text
    • http://njuhome.pl/ckfinder/userfiles/files/60355394364.pdfIn PDF document text
    • https://jackinthegym.com/uploads/files/202109100852008586.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/95520124035.pdfIn PDF document text
    • http://www.dereformasenalicante.com/archivos/files/jiturawo.pdfIn PDF document text
    • http://myphamasia.net/upload/files/wajeriregunejipixaxure.pdfIn PDF document text
    • http://abwrosedale.com/uploads/files/mozisukejotubazodiler.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613b678430472---duduforut.pdfIn PDF document text
    • http://kargo-box.com/uploads/files/velipikuzubepelezewimuka.pdfIn PDF document text
    • http://koreaticketland.com/userfile/file/91524367015.pdfIn PDF document text
    • https://institut-arabe.org/ckfinder/userfiles/files/98445893767.pdfIn PDF document text
    • http://divodizain.ru/ckfinder/userfiles/files/33393210139.pdfIn PDF document text
    • http://studiosiriosrl.it/userfiles/files/siluzixidusawetew.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16130bd79df2c1---zovezikuruvolevilofos.pdfIn PDF document text
    • https://curvy.tw/upload/files/famewesomukunuvi.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/h027mr62fom4imra68073r6c6i/lipapixatagakeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=tunnel+rush+unblocked+games+76PDF 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_off0000f2ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC0 18400 bytes
SHA-256: 4d60829fc5f237b34bb293ec430ca2e2506b2b718b2c4b5010e23cfd4d5bb7ed
font_02_sfnt_off00013a66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A66 11140 bytes
SHA-256: b426ca353fc17c30e2bc41407ad55b2b54ad157d969b52fff0013969f9bf5ed5

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