Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4bf5b9417d2b135…

MALICIOUS

PDF

143.7 KB Created: 2021-08-11 20:06:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: dea365f17a6420287c3f08b6d9d5be90 SHA-1: 60bcc61fc5c155a36183ca073d89f461ceb9208b SHA-256: d4bf5b9417d2b13523c971abb79eed9c6e87fcfd0b6cfde436c3f17ab7f96682
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to other PDF files hosted on compromised websites, indicating a link farm designed to lead users to malicious content. The presence of a 'Fake invoice / payment lure' heuristic, combined with the link farm structure, suggests a phishing or credential harvesting attempt. While no scripts were explicitly extracted, the PDF format itself can embed JavaScript, and the ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/tt17qtqnot5cheavdakvrjmetp/70949848696.pdf In PDF document text
    • http://promador.pl/userfiles/file/kiworewototatazol.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160a40efd2b95b---65274752102.pdfIn PDF document text
    • https://heider.ru/wp-content/plugins/super-forms/uploads/php/files/ce2fac061fee563dbbc076e57f852fcc/42360252074.pdfIn PDF document text
    • http://bpsstudio.hu/uploads/19196448553.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/xasisirokefol.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/fc5f538117abc0d11379cd447460cea6/xebina.pdfIn PDF document text
    • http://impressivetravelvietnam.com/upload/files/gugawisilexinoro.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/81599638777.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160edd2aa4a9bd---sobitin.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610106a4d0115---talaregax.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/vtidhpfi51qhvjkaq71d60ckk4/rodopovugujimunewanim.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/83804110649.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/k3dg21crb56rob385u2dofu3u2/76774372681.pdfIn PDF document text
    • http://cerescommoditiesltd.com/Images_upload/files/salevumijifaxidaloki.pdfIn PDF document text
    • http://paolacaone.eu/userfiles/files/92825524596.pdfIn PDF document text
    • https://area34.info/wp-content/plugins/super-forms/uploads/php/files/kraqnt9ut7d6qjmbmk9hu17qd6/46042112803.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/cdf695a9c86c38531c8644e1ce3fcce3/mosofosoxudafujubifetef.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/nopolizolanakibibe.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9eebd0ce0---romedenosivi.pdfIn PDF document text
    • https://camping-du-lac-dijon.com/fichiers/19059313353.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1610300528e8d0---86383589913.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160adeecee878d---tewoxagopekomekibekuzuxe.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b5605f6e3b6---pevepokat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=sap+delivery+table+sales+orderPDF 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_off0001d251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D251 17500 bytes
SHA-256: f1898d5f426727e19f8e0f45c42f2a5125b5df7cf60757aca1d22d86968c39b0
font_01_sfnt_off00020079.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20079 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00021890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21890 10676 bytes
SHA-256: 20b78b7cc61b71c9c49c57fde25d8b98fec423c79e169af231a7a5e1b7be13bf

Open this report in the interactive analyzer, or submit your own file for analysis.