Malicious PDF — malware analysis report

Static analysis result for SHA-256 caf8ff6a8230d1bd…

MALICIOUS

PDF

76.7 KB Created: 2021-06-23 22:51:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: eeab891278aa2859ce57a3045f12234e SHA-1: 4a42d2aca62cd6fe0a0b28b494252cd530eac85f SHA-256: caf8ff6a8230d1bd2661dc4ba38b3104214f44a63266238b59ecb4cf4fc3c12f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://aldea.work/wp-content/plugins/super-forms/uploads/php/files/15c98e249bf7b0c7b10d00eb813aac96/fuwawasodamitele.pdf In PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/0044a3f734d15aea9954462cb4172d21/gudibuvobezenalile.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/eho65ftldovs8f32rmr7tu62fv/riluxifufaxexowafegatobo.pdfIn PDF document text
    • https://agermag.ro/mm/file/24154043708.pdfIn PDF document text
    • https://local-atlas.ru/userfiles/files/22330069147.pdfIn PDF document text
    • http://abpaluso.com/upload/file/47390786300.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf58f3bc3e---28220578035.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/8e8f487a5714762066589226d7f899fc/80470232582.pdfIn PDF document text
    • http://yaeram.com/userData/board/file/joromaz.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/vc04hknbrsmqgh1ricp5c6putt/futosidib.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/41659afbd2c6099f79fc718271a11240/67682764197.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/losefirutikojarore.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160caa321cd922---70395583526.pdfIn PDF document text
    • http://abpaluso.com/upload/file/gipojuwimumodogade.pdfIn PDF document text
    • http://fst-uinsu.net/userfiles/files/remelusiw.pdfIn PDF document text
    • https://universal4shipping.net/userfiles/file/nizamopad.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a3ce8a4e2fc---12933169179.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160781ad8591f0---pimobupogakub.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b489011103d---xexiwaremigexinikopolo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=taller+de+creacion+literaria+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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED75 4920 bytes
SHA-256: b098d5a6b773802a053b21e9e5cbb5930744b7df44ee99fce4b0d28914fdb911
font_01_sfnt_off0000fe44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE44 12192 bytes
SHA-256: c53766f979dc19f9dc5972d615b1d4630f9813c0461b449e824bbb37c8015aeb