Malicious PDF — malware analysis report

Static analysis result for SHA-256 519c860b59129171…

MALICIOUS

PDF

94.2 KB Created: 2021-09-18 13:49:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6351e8aad62619078cc2978515467f5c SHA-1: 1567c1d0f1ca2b215bea231f4ae7263889489a27 SHA-256: 519c860b59129171902e32a524addb6dc7fcb146842e6eaa5de85cbbe9aaa8ed
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to multiple compromised WordPress sites and disposable domains, indicating an attempt to distribute further malicious content. The presence of a 'Password-protected archive handoff' heuristic suggests the document may be part of a multi-stage attack where the actual payload is encrypted. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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 https://open-call.fr/uploaded/files/tusarorunuxuvew.pdf In PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161323d8f67a3c---punetuzulevuleroralikuza.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/zosaronulofijozo.pdfIn PDF document text
    • http://ouhkpthaa.org/userfiles/58132762932.pdfIn PDF document text
    • http://b40555.handyfriendship.com/upload/files/xefiliribimiwavibanan.pdfIn PDF document text
    • http://archiw.bibliotekalesmierz.eu/img/upload/files/34360681481.pdfIn PDF document text
    • http://abcgsgeds.friendship-match.com/upload/files/46207225977.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/64d203d3de03ac2f8d09d50295b82720/17841973423.pdfIn PDF document text
    • http://frutapac.es/ckfinder/userfiles/files/87961096850.pdfIn PDF document text
    • http://mtreurope.com/ckfinder/userfiles/files/88786585794.pdfIn PDF document text
    • http://gordostcrista.ru/userfiles/file/senegogisoworasaxukitaw.pdfIn PDF document text
    • http://cdseoulps.com/uploadfile/fckeditor/file/71772627984.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210904075324071.pdfIn PDF document text
    • http://dui-antidote.com/images/userfiles/file/8644841507.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/cfa3c062b6e6698645daa98ca0db604a/65633872996.pdfIn PDF document text
    • http://cmtdental.com/upload/ckimg/files/95652911824.pdfIn PDF document text
    • http://studioschicchi.eu/userfiles/files/gatagasurozudotosonuwodet.pdfIn PDF document text
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613244144bf35---zuzomegikomi.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/mivorivimom.pdfIn PDF document text
    • https://momentous-inst.com/uploads/image/files/25459170753.pdfIn PDF document text
    • http://birdwatching.sk/media/file/47463156572.pdfIn PDF document text
    • https://livres-d-art.com/ckfinder/userfiles/files/94434767017.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=como+salvar+contatos+do+android+no+pcPDF 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_off0001044b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1044B 10640 bytes
SHA-256: f8b507bfe1bd5e362a537a9944d81892dd5e730f5fdaca4a0f4c69065cab0967
font_01_sfnt_off00011ca6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA6 21684 bytes
SHA-256: 7c3fa81b853c090156a5de072be9945f482121c4098f70472d706e52b3c847ac
font_02_sfnt_off00015300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15300 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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