Malicious PDF — malware analysis report

Static analysis result for SHA-256 da928d2e1d29dd5a…

MALICIOUS

PDF

84.1 KB Created: 2021-09-01 12:04:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 89eab511adc1c4be9c209388c74330a8 SHA-1: 19d3ee50bf2c3ef5b87efafcdcacf38c907391d8 SHA-256: da928d2e1d29dd5a30b36ccba82476c8d4547de3c40dd610ee0a944568d8919b
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or download further payloads. No scripts were extracted, but the structure and URL analysis point to a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://st03.it/userfiles/files/katilomajanekixewagufepi.pdf In PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/bh1pfcovj79a78us0gn6r8ib73/kasuxibawigubibojed.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a27fc65b483---tumibikonunaled.pdfIn PDF document text
    • http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/xugafutunusa.pdfIn PDF document text
    • http://meskerjager.nl/media/files/finatubevinadufed.pdfIn PDF document text
    • http://hitechdentalhouston.com/uploads/files/48560631061.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d7bfb0678c4---losafokoperi.pdfIn PDF document text
    • http://alianzablue.com/aym_image/files/bijemajorosax.pdfIn PDF document text
    • http://fitviewer.biz/files/file/wesisotinobumijovif.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/35160023285.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/297f9de92662e3aa32af1f8997948ad7/wededode.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16077841b02200---75542720465.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/3759bddc8f2530a433ceebd9fe168874/6791927440.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/menijijuguf.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/gonozozekifadurap.pdfIn PDF document text
    • https://festivaldelmaridaje.com/sgi_userfiles/userfiles/files/58406598024.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160ded14206b21---nefirutuwab.pdfIn PDF document text
    • http://nature-revive.org/files/file/panafafobazuvu.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/depirogu.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/togapuwivanulejadupowofow.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/5d88e8f08f65531b8e24832d2eaa5f8f/58109861505.pdfIn PDF document text
    • http://arqing.es/ckfinder/userfiles/files/jiniwavewomatepajidudax.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/ramuxevogotuzepisiwimixu.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/9dc9730600c07e1f251f615aac801f38/bolugavesela.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/84529825253.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/8a6cb06d5fe557cc83567c0569a14c8e/funewotijixizusixe.pdfIn PDF document text
    • http://rc-modeller.se/images/file///21337159419.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074164163f18---nenonubajipab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=charles+capps+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_off0000e452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE452 10332 bytes
SHA-256: e0be9609c4aa5ecbc6a89e0dfccaff3d91d22fb5ddaf63cfa7e941c942259c75
font_01_sfnt_off0000fbc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D5 18352 bytes
SHA-256: eec8694866774564b6c63b9720b194ed9b51b4e416d93dc97d2d95e83c05e92c

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