Malicious PDF — malware analysis report

Static analysis result for SHA-256 798095b57be64498…

MALICIOUS

PDF

82.5 KB Created: 2021-08-20 11:35:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e18d25b45908528706e9b9ff06c3c45d SHA-1: f7d77fa81517d0d624290fefd8bcf423ed05a499 SHA-256: 798095b57be6449881cf68a8fdec8147c49dbdd6c84fc1d1806b3ea6edf8e16c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, directing users to numerous compromised websites, many of which are hosted on disposable domains or utilize formcraft/super-forms plugins for file uploads. The presence of these links suggests an attempt to lead users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://aranykoronakft.hu/userfiles/file/99228033542.pdf In PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078671110b3f---48409270317.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091021a12384---22965245579.pdfIn PDF document text
    • http://recrute.fr/files/files/nigubojotuluj.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086c78796215---gagalenarunubuvuk.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/b559d804eafebc74a41578e6196bf71c/jirisal.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/9b579d179ff7b024db0424a4a6686efa/91038026299.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/h9etfsn5ng6nuo2b43i7gmqh1r/38721537768.pdfIn PDF document text
    • http://joinsocialbubble.com/cake/beta/userfiles/file/79057243043.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/wibarotokosikubisixid.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6d4643b062---vuritupaxudunedatoze.pdfIn PDF document text
    • http://architettogherardi.eu/userfiles/files/55723792140.pdfIn PDF document text
    • http://zonwering-belgie.be/ckfinder/userfiles/files/67920178757.pdfIn PDF document text
    • https://anglarill.net/userfiles/file/neruxipowabemupalig.pdfIn PDF document text
    • https://euro-m.si/web/dokumenti/file/matap.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c51c7a8fdd7---bukoralo.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/56759303669.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ad87baa5754---16522863026.pdfIn PDF document text
    • http://escritacontabilidade.net/fotos/news/file/lajavisisakuxilutetemek.pdfIn PDF document text
    • https://www.renfrewareahealthvillage.ca/ckfinder/userfiles/files/25403739577.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/31755158289.pdfIn PDF document text
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b285a13f195---47359217693.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/kasemuwowanipojesenama.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/juforuruzazigizovapezugi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=red+queen+full+book+free+onlinePDF 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_off0000e20f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE20F 16724 bytes
SHA-256: 4c8774fe4094af7417ce6b88092c162cbc373d07d47677fc944d26fa37312317
font_01_sfnt_off00010ce2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE2 10440 bytes
SHA-256: 7af98c55ab64969e863ccac420589822db9e008870be38c749bd8f7ac8ed1797
font_02_sfnt_off00012463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12463 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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