Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6dc242efc6cd6cd…

MALICIOUS

PDF

86.7 KB Created: 2021-06-28 19:12:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a377d61fb38d2de8225581a085b463f5 SHA-1: 08916f7a2b4516971c78c32b9411091d9d776348 SHA-256: b6dc242efc6cd6cdcc16d18c54782821cee5d26d9b8f5dc810212a154d1b8d38
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm pointing to compromised websites and potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or SEO manipulation. The numerous URLs extracted, many hosted on compromised CMS uploads, reinforce this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://actor-conseil.com/files/file/xosukanaxipejamas.pdf In PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3cd0d5bdc---zotumamifukeluxu.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160afbb14e3c33---dezabarupujowude.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608042edc92af---72637696590.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/33570380052.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/25100fa8678a285781a961f9d3515330/wefalerarewativenimelolir.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/julijipuxigo.pdfIn PDF document text
    • https://ibeguiristain.com/userfiles/files/gomufasemak.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/dotebisefufomaleta.pdfIn PDF document text
    • http://slhs1958.com/clients/18590/File/xobexif.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a000c01841e---newojimalibogije.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16077ccd9b9bdd---zepegiwibabiz.pdfIn PDF document text
    • http://banghetretunhien.com/media/ftp/file/71332986537.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/50843356998.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/18acf15a85f7ca33d1453081371c8277/dabixeraxarazuzurefudo.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e63ed10566---44084997976.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/63115619212.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/90663297674d8c81ef33aaba967c58d2/kikitusufepezonofo.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/tadilufo.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b3545001586---nuxaj.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/8381cecf1f83e4640540744507108c5d/14712231774.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/ginusimakivapuwurufuwuram.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/420rrold6bdc3gl3p1f174qml4/poniji.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4dd8dbfed---nifupavipadiwalarilonej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=how+many+organelles+are+in+a+plant+cellPDF 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_off0000ef72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010784.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10784 17160 bytes
SHA-256: 3a566404f435fd80e3329844f79e183aaadb8e36ebf23c68c40751d12a183868
font_02_sfnt_off00013424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13424 10908 bytes
SHA-256: 4aef8e18490b66d0fdcabff23624ad1c590a218ef73befa8b370345bb7bb608c