Malicious PDF — malware analysis report

Static analysis result for SHA-256 63255c319394089e…

MALICIOUS

PDF

81.9 KB Created: 2021-10-15 00:34:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c1e93e974566e2c6f43695e3ec9a2a9a SHA-1: eec8ba2d5f72c874c2a6d0ffc20642537c77110d SHA-256: 63255c319394089e3b9e3514e11218ce717e66b5c4ced33e1ccb9ee0e46c5ce2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a link farm pointing to multiple compromised websites, likely intended to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to exploit users via these links, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/ca226adff3341ddce91e8d6254c2f06c/62325124188.pdf In PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16167553b22181---87255924945.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/6e48b22eddce90bc9bdc802e4526d185/48599250295.pdfIn PDF document text
    • http://elektromig.pl/userfiles/file/fiboguzeruwowineti.pdfIn PDF document text
    • http://studiogalata.it/userfiles/files/xetibosidulumuxevot.pdfIn PDF document text
    • https://konteshamamotu.com/userfiles/file/volefijivajadanugi.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/76d8a8efbe24661a8e413981aaaafa1d/52716582133.pdfIn PDF document text
    • http://ktcz.eu/files/files/koxexefomuvumatus.pdfIn PDF document text
    • http://fusiongrup.ro/userfiles/file/lakirevewaxobifad.pdfIn PDF document text
    • http://pixel-pro.ru/upload/file/72063160173.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/vogoxufufe.pdfIn PDF document text
    • http://jtg-antracyt.pl/files/file/52329338186.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/mupivigoje.pdfIn PDF document text
    • https://ghnservizi.com/file/wowalubapuwekuli.pdfIn PDF document text
    • http://confidenzacsapagy.hu/upload/kirizononukizedoj.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/96953963728.pdfIn PDF document text
    • http://kccmaul.com/files/files/koxufaxexixavonuvu.pdfIn PDF document text
    • https://unibel.pl/pliki/upload/file/japazonesobikufeziwe.pdfIn PDF document text
    • https://emotionalgift.youngzonejewelry.com/ckfinder/userfiles/files/34575525453.pdfIn PDF document text
    • http://flexa.cz/docs/file/13978914289.pdfIn PDF document text
    • http://madonnina.info/userfiles/files/puloxiluvewavepef.pdfIn PDF document text
    • http://abpjse.news-read.com/upload/files/79442916263.pdfIn PDF document text
    • http://isisthailand.org/file_media/file_image/file/51184339386.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/31964346813.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/23D8k0Ec_6w/uplcv?utm_term=how+to+grow+onions+from+store+boughtPDF 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_off0000de86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE86 16304 bytes
SHA-256: b6ff81899f9022353839daf7af1e2361b75e4b2dd1e2efcf891dc5c52b250d01
font_01_sfnt_off000108e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E4 10768 bytes
SHA-256: 4427eed749de88e146328627256fdc8e3b72d3d32b68ae993d97c6916cc8b6f6
font_02_sfnt_off00012184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12184 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1