Malicious PDF — malware analysis report

Static analysis result for SHA-256 4de5fbd2abf2016f…

MALICIOUS

PDF

89.1 KB Created: 2021-07-31 09:12:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 02926ce9060a59e5fdbe8e176d94b56e SHA-1: d7e77d3fb8af1f84100a71c940a89dff29f29e12 SHA-256: 4de5fbd2abf2016f2c2fcf6065ff2115c362ce037ae12d4ff2f74f8f64a6a853
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites used for file hosting. Heuristics indicate a link farm pattern, suggesting the document's purpose is to lure users to these external resources. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074d83c6fd8d---vetuvin.pdf In PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/2069049384.pdfIn PDF document text
    • http://www.minaakshimajumdar.com/fckimages/file/87058239342.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/a353ecb026075e23bdbb2e05a9ef1bac/fojigezu.pdfIn PDF document text
    • http://serramentisiciliano.it/userfiles/files/noromagel.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160f076da33d3e---69324602434.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/4caf1bd9df88452ce5576151a7da0ebc/vinakagixeloforev.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/c1462b63683343a3498605a8463891e8/36802277327.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c752536c56b---newawukozurixanulejilup.pdfIn PDF document text
    • http://ng-sons.com/userfiles/file/57976047123.pdfIn PDF document text
    • http://diamondsnspurs.com/clients/12200/File/7233632756.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/f5fa6d9ebc1fdc261c4fcbcab67bba97/zasowedilikijepelopamuful.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a27fee15647---50602620503.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/xekibonatuletibar.pdfIn PDF document text
    • https://eurouniversal.eu/ckfinder/userfiles/files/zetesijejujavi.pdfIn PDF document text
    • http://www.specemc.ru/upload/files/63485918498.pdfIn PDF document text
    • http://www.tokyomagic.jp/images/library/File/tamixalik.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/cihiqpf3q6so6v94slecj866s6/pitepudanere.pdfIn PDF document text
    • http://taispacedesign.com/upload/files/sulovulefuluwawivu.pdfIn PDF document text
    • http://homeshopeez.com/uploaded_files/userfiles/files/63148773124.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/0fb3465a0cd45f5353b0b5ed4194024c/19470119282.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088daa71aba6---fuzosinokujibolorovikagu.pdfIn PDF document text
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf366138c2---nolifomulibuninosixe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=icolorama+user+guidePDF 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_off0000f93b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF93B 17060 bytes
SHA-256: c6d7b870d18e2fc2e99cd75b0c4477ac13dae1f331aada58be481c134ee0878e
font_01_sfnt_off000125bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125BC 10560 bytes
SHA-256: a2a8864610b9a2497791fe82ed3aeb24235d51403c546ebebf44b3a34e7eebca
font_02_sfnt_off00013d9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1