Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ecac787ca43736b…

MALICIOUS

PDF

118.8 KB Created: 2021-09-03 00:26:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c5360dbf8303e96d02e2b997e3ce1b27 SHA-1: b3b1f0b1db609541263dcbb5a463c28533286ceb SHA-256: 1ecac787ca43736bf8b67ed2d8374e59f8b8e0be408102ed65ee1923cdad2d2c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with malicious document delivery, likely via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://smartcirclegroup.com/userfiles/file/jazuwulalarubumada.pdf In PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/9383756c325c8af245af688536698c25/74296070551.pdfIn PDF document text
    • http://stringquartet.biz/web/images/fck/file/vibeminavozo.pdfIn PDF document text
    • http://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/44610244548.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/92116898006.pdfIn PDF document text
    • http://islandpointfl.com/userimages/64789336197.pdfIn PDF document text
    • https://orangcar.com/app/webroot/upload/files/voloxot.pdfIn PDF document text
    • http://www.ochoadentalcare.com/tacgestorcontenidos_ochoa/documentos/file/In PDF document text
    • http://www.tecs4.com/intranet/ckfinder/userfiles/files/demew.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16086220993b88---nofemiwito.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/desodanusubel.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/225b4e880bb73d49c256fecfc0183a8c/fuvifalarax.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/tiwuvip.pdfIn PDF document text
    • https://www.hermanosvalerorecio.com//ckfinder/userfiles/files/77840152202.pdfIn PDF document text
    • http://vlajkylevne.cz/UserFiles/File/sunilogakoduloxapuf.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/kemekuxato.pdfIn PDF document text
    • http://3xlove.com/uploadfile/file/90264094861.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/172700bc4f819f5f9d22b652e4789f8a/30229142429.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b5783d48479---96751094690.pdfIn PDF document text
    • http://purifoy2020.com/clients/1/11/118d8b7ee1ea4bab8fb19da95c56260f/File/57028368369.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/495lpjjt3hdn02cr7ungkead45/dejesaduzowazef.pdfIn PDF document text
    • https://tanasiri.com/piceditor/file/69843334769.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/4hja6b7s2ttkqeful3934ldo61/gekujub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=28+glaubenspunkte+adventisten+pdfPDF 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_off00016c03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C03 11080 bytes
SHA-256: 01b5347dc6c57d4628282676305e97fe92db4870d79ca0c3863c8c43f680b5cc
font_01_sfnt_off000185a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x185A4 19000 bytes
SHA-256: 3c29a184a5a4c258bd88fbff0d90ebe656524490ea301c5881a23f905bb65986
font_02_sfnt_off0001b560.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B560 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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