Malicious PDF — malware analysis report

Static analysis result for SHA-256 cce468151c0010a6…

MALICIOUS

PDF

79.9 KB Created: 2021-09-04 16:31:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2d4f36d54bc826da5e084364d490c54e SHA-1: d58b859db4779cf7ef0c4629bbc6a9c1ded87aa4 SHA-256: cce468151c0010a633a9df9db166f14713ab5d6a0035f2296cc7811536855323
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting an attempt to redirect users to malicious content. The presence of multiple external URIs and link farms indicates a likely phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/8de0d4161775c8fafb2a0a3e72388d5c/20300189203.pdf In PDF document text
    • http://www.europesolidaire.eu/userfiles/files/fugupobamaviratiweji.pdfIn PDF document text
    • http://noahsmarinesurveyors.ca/userfiles/file/dodesubovima.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/cd1cc349594ebc510848f51a8e9d5d55/43783261302.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a14bea8ea0c---35281950249.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/vugelalaxixiga.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ee7c73d1915---fefagexezaduxuxopag.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/3aaoiv1kh2n0ugpqiag1or20jn/kogonimidopikevikinololu.pdfIn PDF document text
    • https://valleyrestoration.net/home/apf/public_html/ckfinder/userfiles/files/devopizogonipux.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608700618a96c---zevowerobumovomavezofow.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5956a8c40d---36888397264.pdfIn PDF document text
    • http://aiaato.com/FileData/ckfinder/files/20210621_6857E55844DF635D.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/fifozukonula.pdfIn PDF document text
    • https://www.fangjin.org/ckfinder/userfiles/files/29876607440.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/7kv9k1ch12t5sjkun5a7qh6da6/26864691565.pdfIn PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/067fc777f23ed0a8dc2b5f1bb8e30b79/ruzoxetu.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/gerakejivipen.pdfIn PDF document text
    • http://rowerowaszkola.pl/imgturysta/files/sukawi.pdfIn PDF document text
    • https://mmszke.hu/files/file/duwejotofosikawaxezonori.pdfIn PDF document text
    • https://pablohernandes.com/wp-content/plugins/super-forms/uploads/php/files/d9635f13efc6a8fb9e7018e2c1112862/7674369851.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/7a008d018ec808a4e4b48dcf57cf78e0/jatotokowara.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/67914551781.pdfIn PDF document text
    • http://tjclassof1971.com/clients/1/16/169b02496b2253913efe31a5b05f4f66/File/sukexizunijosorexixakoj.pdfIn PDF document text
    • http://lesen-und-schenken.de/userfiles/files/refufazalupunubejim.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16090a0c166e9c---26180146248.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=javatpoint+css+pdfPDF 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_off0000d4fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4FE 10392 bytes
SHA-256: 773b1261c16d232d396e683b13a29e366523ddc1f09f08f0b720ce6f968d7b40
font_01_sfnt_off0000eca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA7 17144 bytes
SHA-256: c4c4ddf97902ce3120d8a3735f8689cbd76a24a4d12fdb5909047ff4bae206ee
font_02_sfnt_off000119be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1