Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cc2ef183cf16443…

MALICIOUS

PDF

72.4 KB Created: 2021-06-29 17:45:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 331db64f9c6ce83bb76217a2339a46a9 SHA-1: 1bb7ced552f60ccf7c3f2d7b2b77f00f5004fe43 SHA-256: 8cc2ef183cf16443662be7beb7841514912580aa4b9adfa8e3c39bd821e378f7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous links to external websites, many hosted on compromised WordPress installations or disposable domains, suggesting a link farm used for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/4774a47cd17c1aae2e5a0b5cf23ac95b/50187315959.pdf In PDF document text
    • https://embassyinvietnam.com/webroot/img/files/82452764992.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160afe2911ed52---dojuji.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/8a82e3e254a35a8a6983c55d68c602f6/varulugabixorikaboboful.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa69e3de58---ranosuzir.pdfIn PDF document text
    • https://www.tunnel.de/files/uploaded/file/jibolinud.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f127b45e5---kudaziz.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/53d29bfb034ab9e1eb7bfd06bded4d8e/1118478462.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/36868178439.pdfIn PDF document text
    • http://hoinhikhoavn.com/img/files/nezerewax.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/59584883971.pdfIn PDF document text
    • http://nbpcpentecostalchurch.com/clients/65183/File/tarojigidalejixilugab.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/16093b6f790e4f---22170865277.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c9527460bc6---xiwazidovopixebube.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/b3f6310372ddf5084c11062a263cd39f/folakejixoruxipobum.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/07fepd1feobbmi65mm1h0252pi/83324878302.pdfIn PDF document text
    • http://zge-led.com/luodan/images/userfiles/file/81315663238.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098b0966f980---47700077323.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/10383935442.pdfIn PDF document text
    • http://taiwanglassgroup.cn/userfiles/file/gizejigasabij.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607afcad591ba---pexisukenejaduv.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/ff5nthng2bn2bobpc285pccjl1/12699391709.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160797ce97f38b---76298133850.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/jefilisoguwusabomuranox.pdfIn PDF document text
    • https://sonarmusic.hu/up_image/file/lijolabila.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=beoplay+m3+manualPDF 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_off0000ba8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA8D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d2a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A4 10392 bytes
SHA-256: 4a3696be5434361f5d436d82e50a2d21c5ae17f0adc18136ce7e28b3dfacc076
font_02_sfnt_off0000ea2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA2B 16708 bytes
SHA-256: 8aa72ff1fd7fff261d286032625e40492be015ab5278ebeebb2d351af3d0f373