Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a17467b69cf4dbf…

MALICIOUS

PDF

74.5 KB Created: 2021-09-15 12:16:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: f244ec030705dd153a50ffdc0d3363ef SHA-1: 7353e0a24b5d4e22ff73649b9a81d69c571df41b SHA-256: 6a17467b69cf4dbf6718a43d08644aefe7930f2309ff438bc1a19b0e52703424
204 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The embedded JavaScript is a common technique for initiating malicious actions within a PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://ctnphrae.com/ckfinder/userfiles/files/2670518966.pdf In PDF document text
    • https://chowdhurytourism.com/ckfinder/userfiles/files/51138052388.pdfIn PDF document text
    • http://ifap.it/images/file/siniwo.pdfIn PDF document text
    • http://chataphan.com/file_media/file_image/file/sunuj.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f50cb3b77d---sezez.pdfIn PDF document text
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/nuwifawepinaxazabugivaseg.pdfIn PDF document text
    • https://mklaassen.nl/images/file/kijupire.pdfIn PDF document text
    • http://opuspointpartner.com/ckfinder/userfiles/files/juvoduwitigepi.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/161411b55c5a26---41191892527.pdfIn PDF document text
    • http://cmrivestimenti.com/userfiles/files/gupemogebowuko.pdfIn PDF document text
    • http://stigstudiotecnico.it/userfiles/files/xuzururujim.pdfIn PDF document text
    • http://autosvanbeek.nl/mindcms/js/ckf/userfiles/files/lolomelenowa.pdfIn PDF document text
    • http://cuadepthanglong.com/images/ckeditor/files/dijolojejudomezavum.pdfIn PDF document text
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/22408082227.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614111d7ae324---38490204829.pdfIn PDF document text
    • https://www.assofmt.org/ckfinder/userfiles/files/mizini.pdfIn PDF document text
    • https://monyetjoget.com/contents/files/lidobupefufifum.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161417c132dc04---lazadunopepominag.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614139886ce31---11574551619.pdfIn PDF document text
    • https://dailyiat.com/html_upload/file/90978059283.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=best+live+wallpaper+app+for+android+2021PDF 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_off0000bee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEE9 10992 bytes
SHA-256: 58624a966ed4041490ca01d925eed19bc7f0e9f48e1ad75a40e879ac30c13a8e
font_01_sfnt_off0000d8af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AF 16992 bytes
SHA-256: 24e56e2ecf28ed68879915e17392b6e330dff18b40f8e5ff54db1e3c3b84b304
font_02_sfnt_off000104da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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