Malicious PDF — malware analysis report

Static analysis result for SHA-256 df2947c96c3cbfa2…

MALICIOUS

PDF

81.5 KB Created: 2021-09-06 03:44:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7af545ac39d19b433bf4ee7ef737bb52 SHA-1: f5e809aab36530a68d7956b6534531c3c91a6baa SHA-256: df2947c96c3cbfa2c6c3fc8167798dea84961416daf28aa06a1d2ab54723f320
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://xn--zb0bw3kv4s8mn.com/upload/fckeditor/file/fepimukafofilogikezujekew.pdf In PDF document text
    • https://j26clean.com/upload/files/dimububaruvodukeni.pdfIn PDF document text
    • http://colantuono.it/userfiles/files/viguwerixekevuziretej.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160a6dac2c81ee---98139854812.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16114f34a1abfd---16046158935.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/guxule.pdfIn PDF document text
    • http://sipsak.nl/userfiles/file/juvowapasibifirepeke.pdfIn PDF document text
    • http://biaikatolikus.hu/files/file/68286863793.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b6c75420ce---kugive.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf2121dc968---nunew.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/1e360c6908fe1b6a8bbd6bde95f995ce/44731491379.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b139759b972---82042015572.pdfIn PDF document text
    • https://panificiopasticceriabattaglia.it/file/puserebowukomoxupuvux.pdfIn PDF document text
    • http://homeshopeez.com/uploaded_files/userfiles/files/dixapopupopibejasos.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be0852ac241---sozudofut.pdfIn PDF document text
    • http://tcihk.com/userfiles/64930344826.pdfIn PDF document text
    • https://nexusmediation.nl/files/94887918214.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/mimuzadapo.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/zorezotemofiref.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160a00cc22b0d0---1122993578.pdfIn PDF document text
    • http://lutechmed.com/Images_upload/files/22007886859.pdfIn PDF document text
    • http://mebelhotel.ru/userfiles/files/82914034517.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/fde76e13bf77a6691ed3cc5624796360/60815612778.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=guiones+de+obras+de+teatro+en+ingles+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_off0000d683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD683 18612 bytes
SHA-256: 88e8948dce04bbb7ec4c3867e8fee47030fdaf9d621df633a6965b5a401d86bf
font_01_sfnt_off000105c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011dd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DD8 10952 bytes
SHA-256: b2e22b0393654d3c5416810a22516a2386a129ea629fab3123fc3d0ab3d2c63e