Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d5d606f0a6bd4a8…

MALICIOUS

PDF

77.6 KB Created: 2021-09-06 21:06:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3f20f6912a19129c51c216847df7a8ff SHA-1: 67fe0deb285cd51d2c4dad37eec03b0a754ff730 SHA-256: 0d5d606f0a6bd4a80d943d29a914e044a492f1dd5cd244cfa4014b002b82bfd4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to various websites, including those hosted on compromised WordPress installations. The presence of 'utm_term' parameters suggests an attempt to track user interactions, common in phishing or spam campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=numerales+e+indefinidos+6o+primaria+pdf PDF link annotation
    • http://fotografiafrancescosomma.com/userfiles/files/bebutadibifixavutid.pdfIn PDF document text
    • http://spoanalyze.com/wp-content/plugins/super-forms/uploads/php/files/ca4c2902c431d28ce5827a6188f47184/zawofugefunutibope.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/991386e6b3631ad51fa7cbad6b16e2ab/78661026826.pdfIn PDF document text
    • http://polesprogettazioni.com/userfiles/files/19144232902.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/25261396034.pdfIn PDF document text
    • http://www.cottagegrad.ru/files/file/24820512569.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607474cbd3078---85804984382.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160daa893f280f---rulekuleturujogobulewaxi.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/17145926252.pdfIn PDF document text
    • http://satunatc.ac.th/ckfinder/userfiles/files/31784508559.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083112f6fb9b---83679163288.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160836eb4ed05b---82321479423.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/f89550fb3a851f6a972fd7a4216bc6c3/wojigewarolebifofofeguzab.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/javosifuledozajanagomumu.pdfIn PDF document text
    • https://hansenlight.com/UploadFile/files/65685330738.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/1861638028.pdfIn PDF document text
    • http://harasim.cz/uploaded/files/fobijazosunu.pdfIn PDF document text
    • https://voziky-paletove.cz/mctree.cz/pictures/other/files/30951599745.pdfIn PDF document text
    • http://rgjbreunion.com/clients/6/69/6950e03db8b1ea894755b369f0a03c31/File/sugufupif.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210808_0F1503C7DFEA1538.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/4noeun1beiikl5kt8bqc8b0fkf/walalofojabewu.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608430ea16d47---zutarilorepagasoriluta.pdfIn PDF document text
    • http://ulv-fogger.ru/d/files/86156502884.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160769e6f61638---16796903651.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_off0000cc39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE450 10804 bytes
SHA-256: 8f8c0af3ccf3dc7a90406e0156e97c19a1a8ed4dddd058a4fcb8d636563d4596
font_02_sfnt_off0000fd24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD24 16976 bytes
SHA-256: 8bb4d9548e717a87aef05f176863d8c01ef3b4b7644c2b1cb713266b8b6d06af

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