Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec00f561ec0cde40…

MALICIOUS

PDF

89.1 KB Created: 2021-08-09 15:12:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0a159706deac0b3be8066d13322a3a7a SHA-1: 52f9168d1d2a45fefe08eb504b80599bc5c5460c SHA-256: ec00f561ec0cde408bfccaad8d731bd9f7441cb68e1c22ce6849d1dd4a14c327
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links to external URLs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for downloading a second-stage payload. The presence of JavaScript suggests an attempt to execute code directly from the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/160720ebb2787d---98307348131.pdf In PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/dk22jq1nnbku61ag1v0rhv41a7/91707862021.pdfIn PDF document text
    • https://mvmdigital.gr/files/files/nusoxuzasodup.pdfIn PDF document text
    • http://kepco-group.com/uploaded_files/userfiles/files/bunadixamujumedix.pdfIn PDF document text
    • https://kemxoi.vn/app/webroot/files/images/pages/files/tuguvegirizo.pdfIn PDF document text
    • http://chinajessie.com/seadata/data/uploads/img/file/162461996069.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/197fe4ffa3f17277a9407f06cc6399d4/sidijarasulo.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/dadobovozipusa.pdfIn PDF document text
    • https://propiedades.net/ckfinder/userfiles/files/19676744834.pdfIn PDF document text
    • https://sinarwaja.com/account/files/56740314704.pdfIn PDF document text
    • https://cnn-logistics.com/asset/files/46137602267.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/a2c3f47f229d90434d593766a07f89cb/63533591578.pdfIn PDF document text
    • https://miguktour.com/FileData/ckfinder/files/20210719_91D5E5CFE34F1535.pdfIn PDF document text
    • https://ckmusicdesign.nluserfiles/file/torajopujigezofezafe.pdfIn PDF document text
    • http://caratow.nl/userfiles/file/gegawazefofubaguduxelizem.pdfIn PDF document text
    • http://sk-massimo.com/js/upload/files/56238060141.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/wowofevovoridiliwo.pdfIn PDF document text
    • https://wasael.com/userfiles/file/negivulunuzu.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a456787da70---22654133874.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/660etsmibl4pifkkggi8ii2886/26729665210.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/bbs143hd8jj3fs14rjotb0i005/50497302179.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9b14c8732---kitovaretesozirebalanob.pdfIn PDF document text
    • https://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b565817ec1---13195592821.pdfIn PDF document text
    • http://fioredda.com/userfiles/files/pegixazupodevedabekuzo.pdfIn PDF document text
    • http://www.irrv.org/uploads/files/10586694489.pdfIn PDF document text
    • https://hfdjet.com/wp-content/plugins/super-forms/uploads/php/files/a0856e84fd39534e1efec0e0f13b7ee2/2506805706.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608de63d32132---50258838873.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=calculadora+para+ecuaciones+diferenciales+linealesPDF 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_off0000f1e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1E7 10648 bytes
SHA-256: 4c6fae3a773c81e0df7b2e8da64a6c46957ace630932ab29f2e2e23d86fe990f
font_01_sfnt_off00010a56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A56 19116 bytes
SHA-256: db0aba9fce4f455e2e2d1ddaefff8a6cb651a69d8cf0844c10532e8edcfc7f4a
font_02_sfnt_off00013bd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BD2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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