Malicious PDF — malware analysis report

Static analysis result for SHA-256 7caac33294b38a2d…

MALICIOUS

PDF

127.1 KB Created: 2021-07-04 20:19:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: dd50618f8069745b72a3227e4bb66e3d SHA-1: fe8fcb1936a13519354f0f1e58ba2681d1dca100 SHA-256: 7caac33294b38a2dbd39aca4957dd785b3dd1c31c567a85ad8bdd09a6288c6e4
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous compromised WordPress sites, many of which host other PDF files. This structure suggests a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving exploitation of the PDF viewer to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/2ff2adb9442b9cfed42a6e27849f18c1/wodipaf.pdf In PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160ac292b237ef---81877707854.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/09a2c4aa81b92719f83425e0fc909106/timijoram.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/bc30036105f6262b59fa3cdce4e55806/12450762894.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/b6e1a6eb28ef8e2a4fe4a608629f2f84/12993754868.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/p5jarlcrojdr6sjqgeucicus62/176444146.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f21dfac063---sodiminugofezewidez.pdfIn PDF document text
    • http://cocoal.com/uploads/file/daxejidusagu.pdfIn PDF document text
    • http://hodori247.com/uploads/files/bilebajebono.pdfIn PDF document text
    • https://expresstestingatl.com/wp-content/plugins/super-forms/uploads/php/files/452c912de35f01d669d1a973b2812527/7261927228.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a334da50682---wobaxuwagogakulokomajato.pdfIn PDF document text
    • https://ildiko-szepsegszalon.hu/userfiles/file/54560932985.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160ae6d89c4b55---54591832938.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/zuvotenaduf.pdfIn PDF document text
    • https://avistravel.ro/userfiles/file/xinemaxuwuvi.pdfIn PDF document text
    • http://quaker1960.com/clients/3/34/346d0055920ff30d27c63167e405b0e7/File/fepawarenanojug.pdfIn PDF document text
    • http://wittlich-luexem.de/userfiles/file/witisuviruxogafunor.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/57545920550.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/jqocoo5vhoob55j7j8esr309l5/31485205610.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/numuli.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/33859532918.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/35976c3d7eeddf2deb35c3c55621d7ef/70206323887.pdfIn PDF document text
    • https://papiratisk.cz/soubory/wapegiborevusiwozirevoru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=to+get+along+meaningPDF 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_off00018b91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18B91 10148 bytes
SHA-256: aab5900e19ae4f806b25d1173e6f65fd0d5d6dbf20e5104828a8ad00384f3a00
font_01_sfnt_off0001a237.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A237 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001ba49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BA49 20336 bytes
SHA-256: 2945e593af1acabe2982bef36b49682d2e83a6b710615a2ab64d6723f680d277

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