Malicious PDF — malware analysis report

Static analysis result for SHA-256 54c6e9b8aa3b265e…

MALICIOUS

PDF

81.1 KB Created: 2021-09-07 16:46:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 602267c305d8145741574477b00dabc1 SHA-1: aaa3bb9f73268b8039920cab26bb1dd4ee641215 SHA-256: 54c6e9b8aa3b265e362bd654a8d6247202a07418b4b3f2e1346b27bdcce0308b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress upload directories, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the embedded URLs and the heuristic firings point towards a phishing or redirection attack, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160efe9f754791---70670963366.pdf In PDF document text
    • http://kamnitikamini.si/upload/files/pirukaja.pdfIn PDF document text
    • https://crossfitbeeshark.ro/app/webroot/files/userfiles/files/54601018459.pdfIn PDF document text
    • http://fittbike.hu/files/file/pajusinoxumik.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/sosevidibetedozefubib1620708691.pdfIn PDF document text
    • http://thietbixanh.net/uploads/files/85785829046.pdfIn PDF document text
    • http://arablift.net/userfiles/file/jufuvabojetiruk.pdfIn PDF document text
    • https://derey.nl/app/webroot/files/userfiles/files/96571146184.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/31450908302.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/4a7ec63f68822e8f25c2d76d29ac0599/17008657957.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b732a83e2c6---48176086895.pdfIn PDF document text
    • http://dade666.com/userfiles/202106file/2021062406360470554.pdfIn PDF document text
    • https://migger.dk/userimages/file/35628889870.pdfIn PDF document text
    • http://geometracosentino.com/userfiles/files/xalufaviboboz.pdfIn PDF document text
    • http://greece-ex.com/images/blog//file/biwitirupizosujimunujuna.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/rimativugafifofa.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a629d283546---diduzepedojasinube.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/jexoxatodulinesazus.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/33564715237.pdfIn PDF document text
    • http://studiodispirito.it/userfiles/file/18032593447.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9d2888374---44999403903.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/3kovd47nqjifadnnjrhenfma0v/mipekubabix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=social+network+analysis+methods+and+applications+wasserman+pdfPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/f93081a02fc4e07c1d0f697610768b9d/35265888853.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_off0000d308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD308 18540 bytes
SHA-256: d7b36ecfc0c4b14c4a63d3a3694ca2192ad67ca3eca0aecc173ff822cab87d6e
font_01_sfnt_off00010402.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10402 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C19 11252 bytes
SHA-256: 4cc0dfeeaec27af87c1c1e7779a71b7d53cf33108c0412b54acb0570bba32a5b

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