Malicious PDF — malware analysis report

Static analysis result for SHA-256 af9cfd9e7043589a…

MALICIOUS

PDF

91.4 KB Created: 2021-07-04 15:36:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 10ac28d042666b0f0205a183c5799ec5 SHA-1: 61712c73dd1d07b8edd75b34960eec4e1ef50feb SHA-256: af9cfd9e7043589a4af4689b0c46c1fadac7f7b05684637e4470523da4e409bb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to WordPress sites utilizing form builder plugins for file uploads, suggesting a link farm designed to host malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were directly extracted, the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b361cad5d5---sepowo.pdf In PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/12tcshldiga0n9dsrib59k8v71/takisowoxivabopuwabawapuz.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/tulizagegopisuzusunen.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160841c82e7c58---82416145842.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/o79e3e1qnjqff9gum4fd264chv/jewuriwitefudoxib.pdfIn PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/nabufipoxetadozozumigo.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/66e0f4a2e4eaf1bf377d73679f05c184/36869841694.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084224c8631c---31342989682.pdfIn PDF document text
    • http://goldartline.ua/userfiles/file/59587239844.pdfIn PDF document text
    • https://pnlcoach.com/misc2/file/In PDF document text
    • https://art-lamps-rali.eu/files/file/42296682278.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160d4efd17a302---12596806767.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/8969766e6290957c1572e39e52739938/popepizi.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/88fbeec5553c75bba0e443a3539d8097/munupopafiduguk.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160802d9f931df---12851384653.pdfIn PDF document text
    • http://evansmedia.ca/userfiles/file/buzivabaxonasirof.pdfIn PDF document text
    • http://hasici-pristroje-eshop.cz/files/file/zejumebilubabeziruda.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/3179cb803e9a020be3957fe50f7b8e4e/mufasaxijetufemoloxure.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160872ebfd04f5---38218298094.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/lowawigisizoxotavo.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/ee940517857f12c2dc60c2f01481ba14/zuxodugufa.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/mawopagobarukevibedaxix.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/ca06cfd650b7ab4c6cacb71e73cc7753/3450965953.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=who+will+cry+when+you+die+in+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_off00010167.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10167 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001197e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1197E 10580 bytes
SHA-256: d94feffd749073c6d444143449bf14f0c39045e40bdeba587f05dd3f52184029
font_02_sfnt_off00013190.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13190 17288 bytes
SHA-256: 217156df770c0ac1bf8a8e85cbfa83db4eca7f3096ea32ad9730edcc17bc28ce

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