Malicious PDF — malware analysis report

Static analysis result for SHA-256 87b3d0bee21145ab…

MALICIOUS

PDF

81.9 KB Created: 2021-09-04 13:16:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3b843a0bea3bd75904b2824d528d598e SHA-1: 25ebc7f9f813a273e0340a90d768c783b62639e3 SHA-256: 87b3d0bee21145abf601ec09965ef250bb5d363defe4a239c479219d2934b09d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains numerous embedded URLs, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of these links and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://irlanc.ru/uplcv?utm_term=quadrilateral+worksheets+2nd+grade PDF link annotation
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/68efd6474571d2a8d9058350a2870c3c/nepeziw.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/4d5db1ade9f7cef6e6c7902521b7b1c2/20261534636.pdfIn PDF document text
    • http://www.salpasafarit.fi/tiedostot/files/vaxabofonus.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/mixive.pdfIn PDF document text
    • http://michellesmithscott.com/clients/36670/File/bowenuvewuvepa.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/vetogag.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/4b8pj37o23r6vuogfm64ma3n20/bujemuruxet.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/midokazamarufosa.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/toweravibixemofuravod.pdfIn PDF document text
    • http://spostojow.pl/userfiles/file/90960785260.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16072a5954eb8e---gurumomodaxezurafemexi.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/fb8d49ab1c05f218790d18a77cebc817/lawevulabuvanewebef.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/sodikedefatog.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/65701b767bad2ffd1221d6da749b89ae/nibizaxowujuzaxusose.pdfIn PDF document text
    • https://vinatech.com/userfiles/file/ruvupafogawikizawenirobol.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609a7f4e27224---11597194337.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/f8f8ee7e1dbff34bba53ca8bc831491b/fosiwadivojozufozawaw.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e97d3a1a5bd---17731947640.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/882ebb52d4233616e98f013b42eb63e4/83246813718.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160aea3a77aada---maxepikipexedevizuxam.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/ac0fadabafa8c6a2fdbb5c8816036d13/pizuzovexadinuriju.pdfIn PDF document text
    • http://zvezda-rostov.ru/ckfinder/userfiles/files/dudefevesiz.pdfIn PDF document text
    • https://mides.vn/images/ckeditor/files/dixepadodetojulosusa.pdfIn 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://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_off0000db98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3AF 10984 bytes
SHA-256: 3926b9dfadf9e1a04daedd12fc859747acabf0f110cbff65224f284e0d9d8abf
font_02_sfnt_off00010d16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D16 17448 bytes
SHA-256: 052a2602f6b7d827dc36b47c0603c6a621b91bfee2785f6b91a905209ba4f302

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