Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6c6cde8748ad3a8…

MALICIOUS

PDF

92.8 KB Created: 2021-09-02 15:44:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cb64dae912eb312fec73fe7ab8cb0c83 SHA-1: 2305d22d9ddf377ebd1ec980f84366f5dbfb7b81 SHA-256: e6c6cde8748ad3a8f85e5d2b5d9b2f9fcacfc42fb0bd4297c84493fd4028c53b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is a PDF that contains a large number of external links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate maliciousness. The presence of a link farm on disposable hosting and compromised CMS upload storage suggests an attempt to distribute malicious content or phish users by obscuring the true destination of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/re89p5d36o8usr1187g7n8nvm7/teserogizosagofavaje.pdf In PDF document text
    • http://youngthisyear.com/ckfinder/userfiles/files/gapowunobetu.pdfIn PDF document text
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/53975638050.pdfIn PDF document text
    • http://hophungvietnam.com/app/webroot/uploads/files/20588814048.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e1293e9d166---bojajoxurarotibidumux.pdfIn PDF document text
    • http://kazuma.ru/ckfinder/userfiles/files/zakexe.pdfIn PDF document text
    • https://searchlink.org/userfiles//file/jelekuwovedazadav.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/kibikixemevunuk.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/96709505834.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b81558bee6---1159930151.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/dikotutogeludifis.pdfIn PDF document text
    • http://concurs-euclid.ro/upload/fck/pexojiso.pdfIn PDF document text
    • http://www.contal-farmer.com/uploads/files/5773389213.pdfIn PDF document text
    • http://greentreeprep.com/cote_dor_import/admin/ckfinder/userfiles/files/93705412816.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/a95051da25fbab6435f7a683b7f0ee70/36422110238.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/verododonovedozupagamodid.pdfIn PDF document text
    • https://ibshospitals.com/userfiles/file/gefaxeginof.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/1213f971593f33f03b76d68fdb4327ca/wizavim.pdfIn PDF document text
    • https://parokisantolukas.org/Uploads/userfiles/files/gezatotofojeli.pdfIn PDF document text
    • https://md-bud.pl/szklo/photos/file/vinuteredarowaxo.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/zizodibizevovupud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=hiit+training+workouts+pdfPDF 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_off00010228.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10228 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011a3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A3F 10764 bytes
SHA-256: 8a29946afb85ff9e9bf00a62e09da43cc41a39cc86f860edf3345f8c2a622d53
font_02_sfnt_off000132f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132F6 19592 bytes
SHA-256: 4938a6c2c4d3e69eab8fb48c97d18248ee78aebcf4000cb2084422c589f885ea

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