Malicious PDF — malware analysis report

Static analysis result for SHA-256 c297f8028279e5a0…

MALICIOUS

PDF

82.1 KB Created: 2021-06-22 20:53:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 2bedf4cf1c921df39993e1303e91b040 SHA-1: 473a8a24037727a838431c3624e844d99a3031f6 SHA-256: c297f8028279e5a0e3c9573ed1cfcfb13974d98d61d2675bd1196e59d7cc2ea0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users to phishing sites. The heuristic firings indicate the PDF is part of a link farm, with many URLs pointing to disposable hosting or compromised WordPress sites, suggesting an attempt to distribute malware or phish for credentials. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://hitecds.com/userfiles/file/salemikifimarul.pdf In PDF document text
    • https://adreshosting.com/calisma2/files/uploads/75837989187.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/c8308244dacbcc6f2100534d325d250c/vudenufilamejimoxovakij.pdfIn PDF document text
    • http://bougerpourstarlight.org/clients/c/c6/c668404594a1c08d975ab50c7bec58f6/File/sigidobeji.pdfIn PDF document text
    • https://nakipoglugroup.com/upload/ckfinder/files/juxuxebigirinofar.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/30199253354.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c42e59567d---wimef.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/0b101b0af447d0911ed7d7b8d83c0ff2/61044710131.pdfIn PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/62086115927.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/a4fe7cd163c11a0afdb2302cdbd74800/pubetizob.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609f20ee1cbb6---jexikilewalomo.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160729d75162bc---16042002890.pdfIn PDF document text
    • http://bangtaisay.com/uploads/userfiles/file/gadolipe.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/59619960719.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/20dfb6ecc8c320da17ccdc79ca88c523/35136532307.pdfIn PDF document text
    • http://penzionklara.cz/userfiles/file/27576649470.pdfIn PDF document text
    • https://keluargamimpi2.com/contents//files/luvogufasafodawomete.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/adbd56ff6f5e8b8b0e8d8eebe69f5663/85846256181.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b94cd848425---saxuwini.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/ratew.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=kodak+bantam+special+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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f26f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26F 5180 bytes
SHA-256: 9ff1d4ac5485e63cd6324d80ae62f0f54476b03898f2f9a8535e9accf98c7e1d
font_01_sfnt_off000103f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F5 12588 bytes
SHA-256: 564a669e89f110f7cd708244300ba9a94f9df3abb0334b6cccb29e6438062b07
font_02_sfnt_off00012ce6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CE6 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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