Malicious PDF — malware analysis report

Static analysis result for SHA-256 18c6adb48a7ebc36…

MALICIOUS

PDF

73.5 KB Created: 2021-09-05 19:49:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 32cf3bc7b5525a56c0b4171ac56c53a5 SHA-1: 4e566965baf3e266642ea2d61f97803d36b29fd2 SHA-256: 18c6adb48a7ebc3639548b9079ee3f523a206c0186af56f6d33dbecc07ac7f21
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites hosting PDF files. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using such sites for link distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing or malware sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8d1d9f0d35---jolorapakukevofoti.pdf In PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160761f68d72cf---fikurabugufaxep.pdfIn PDF document text
    • http://archetipoingegneria.it/userfiles/files/koxabibovabasejud.pdfIn PDF document text
    • http://agro-partner.com/Image/files/9491710038.pdfIn PDF document text
    • http://xn--vb0b83rba554gca.kr/page_data/file/20210523204838.pdfIn PDF document text
    • http://www.investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/pobewof.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b12ba9bbd99---wonura.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160882a3e0c307---78941394738.pdfIn PDF document text
    • http://ggled-smot.com/ckupload/files/96588784674.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/82fccbua0u89snqrin31h2j0d8/64114738177.pdfIn PDF document text
    • http://capitalclassof1970.com/clients/e/e7/e78cae7b17622b0161c193cbd63f4fd0/File/11095305282.pdfIn PDF document text
    • http://detskypohar.cz/upload/file/29223469238.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/risaxazopuzaseweli.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/41360920540.pdfIn PDF document text
    • https://supermagnum-bg.com/ckfinder/userfiles/files/lonoxawo.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/zukimotedajegobugax.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user///file/_0367630001620607576.pdfIn PDF document text
    • http://pierrevillers.fr/mairie_files/file/poletozaxonezisopiluvoja.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/furugosumelu.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/57375917384.pdfIn PDF document text
    • http://talleresjpg.es/img/file/43489520224.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/2fiv6ac165u0m95ecvh1286ege/soxirige.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=difference+in+electronegativity+percentage+ionic+character+worksheet+answersPDF 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_off0000ba1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA1A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d22c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD22C 17108 bytes
SHA-256: ab021d739872bf483d63e6d452f85e7c7f6d5428c13a5c5d4b44e298f7664e29
font_02_sfnt_off0000fdde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDDE 11116 bytes
SHA-256: 89f8f5f9f3a638d2f6a6732c0414019fc4de268ab131e8b008a1b4773de891a5

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