Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dcbd4bf8e8b140a…

MALICIOUS

PDF

74.9 KB Created: 2021-09-21 22:25:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dd1a7abaf16e347b8f129daf05b504f1 SHA-1: 3b13c2b633fdfa9327496bf5d4cd541445e47219 SHA-256: 6dcbd4bf8e8b140a0a186444f417a14b34e439d453f8adfb13850556104afe7a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm pointing to various domains, some of which appear to be compromised or disposable hosting. The URLs suggest a lure related to VPN or proxy tools, likely intended to trick users into downloading further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://marisqueandopremios.com/campannas/file/giradileranobatujubarilif.pdf In PDF document text
    • http://benly-carson.com/product/files/titimusebeduwuwexeb.pdfIn PDF document text
    • http://theorientgarden.iorderfoods.com/uploads/files/tojetoretofedivegun.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/kidevidipazur.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1613512baa8a6a---pisirokevabuf.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138dfbb7adf9---85659182335.pdfIn PDF document text
    • http://rydelko.eu/userfiles/file/muvuzabegamufevofore.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/retipabiwefubi.pdfIn PDF document text
    • http://www.sctiec.com/up_files/FCK/file/waboxifexebamataja.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161491f2e30383---gaginamezadiw.pdfIn PDF document text
    • http://kesifveotesi.com/files/5430427684.pdfIn PDF document text
    • http://ssanadia.in/userfiles/file/61012558471.pdfIn PDF document text
    • https://technoarc.net/userfiles/file/lilobezitiwute.pdfIn PDF document text
    • http://thibangoto.com/app/webroot/uploads/files/45837440345.pdfIn PDF document text
    • https://designclarf.it/file/juduwasefekitezesatalavis.pdfIn PDF document text
    • http://ladna.pl/user_images/file/61655291961.pdfIn PDF document text
    • http://novafish.it/userfiles/files/xofiwirikubabew.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/52522036c847f01387483015b252b3fe/dakimim.pdfIn PDF document text
    • http://www.malagatour.es/ckfinder/userfiles/files/zijajebuw.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd7c6ee7a3---tekowe.pdfIn PDF document text
    • http://valeneighbors.com/userimages/30429625996.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/93284831781.pdfIn PDF document text
    • https://luminex.pl/upload/file/pirevadir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=vpn+proxy+master+apk+free+downloadPDF 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_off0000bee2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEE2 17696 bytes
SHA-256: bfe1717406b042fc9c1e2b142f33b772e2412820c211498e6fb819ef1845f55e
font_01_sfnt_off0000ec9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9A 10928 bytes
SHA-256: d3cf7a30efaa4a9f1c91635e76b2d3c2b854502b1a386a4fb366d0134d40f2c6
font_02_sfnt_off00010617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10617 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1