Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b3566057e36d9c0…

MALICIOUS

PDF

100.0 KB Created: 2021-07-16 17:06:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: b1019dbaf1827c90ec155bf35bf5bd0f SHA-1: 06d18b15bb598193814dc3f1a5a62cdb95bd2721 SHA-256: 6b3566057e36d9c0c0c592f579fd1aff4ce18adcd2b7bd5e56fa7b008e39a400
156 Risk Score

Malware Insights

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

The 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 URLs pointing to compromised WordPress uploads and other disposable hosting, likely to distribute further malicious content or phish users. The presence of multiple PDF files hosted on these compromised sites suggests a coordinated distribution effort.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9800

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 http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160ad84b9bf1f9---govenasuxuledagidodewon.pdf In PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16077e3f6438a0---83758769917.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/59592885252.pdfIn PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/bexilidexur.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/35382634443.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/9d3ad3cf4280c4b005da7f8b1134f3f6/59182256943.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd8d307dc8a---83234011051.pdfIn PDF document text
    • http://apcmagon.com/userfiles/61493959286.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/maodedlvu753j1qmds31b3bsjm/taxitusovetugadesuramu.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/lifumeruf.pdfIn PDF document text
    • http://cachnhietcacham.vn/Images_upload/files/92027216024.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb0b81fba6---33225623949.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/6aff692ffb295aa62ccd3d050a456c32/32397535656.pdfIn PDF document text
    • http://m2m2design.com/userfiles/lemobevutorenanarinu.pdfIn PDF document text
    • https://thedestinbeachhouses.com/wp-content/plugins/super-forms/uploads/php/files/e04e8ad5c89719dd623234a548dfb916/58999603403.pdfIn PDF document text
    • http://saxonrt.hu/img/userfiles/files/luzixijetajopow.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b0ae4a1ae31---fegobimekumaf.pdfIn PDF document text
    • https://mancomunidadvaldizarbe.com/userfiles/files/fikaminukizesas.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/db051426a437c31920f54cc37c483582/lenidugiwipedija.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/19d3746e7e733faa4e46c2ed8faeda37/muwiwevovek.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160985a8d9a2d5---94389791790.pdfIn PDF document text
    • http://rotarylaspalmas.org/documentos/file/71792847504.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/64c12cffe1ee3bd2c3b81b93d8bca0cd/18216381954.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6f2363c8f---33739804964.pdfIn PDF document text
    • https://dailyhondaotomientay.com/upload/files/setibijaxazevomakugedad.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/f1d1635c20b0c9302847e0cf48694825/gevawunupeku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=agroforestry+systems+and+practices+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_off00012229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12229 18368 bytes
SHA-256: 3f781c53755381bcc1e79ea73be306da024bba52a649a751400cecc6dc3eb591
font_01_sfnt_off00015106.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15106 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001691d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1691D 11012 bytes
SHA-256: 6848920854ce2e0aa9ad8ee4e47a6575ec2b5e8030b873d93904acca6963f664

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