Malicious PDF — malware analysis report

Static analysis result for SHA-256 50a09be0cc96a90a…

MALICIOUS

PDF

88.1 KB Created: 2021-09-16 07:29:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: c96cf2dee758f4df794741b24d4ff441 SHA-1: 1b6f97145b1986971457688ad73c61f0ad6b4519 SHA-256: 50a09be0cc96a90ad9f8c021f47325fb603c568bce6629a6cb501be996b2f97e
112 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and a high number of external links, many pointing to compromised CMS uploads or disposable hosting. The ML classifier strongly flagged this PDF as malicious, and the presence of a visual download button suggests a lure to download a secondary payload. The embedded JavaScript likely facilitates the download or execution of this payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://queure.ru/uplcv?utm_term=putlocker+kissing+booth+2 PDF link annotation
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16134cafe89bdd---11545011118.pdfIn PDF document text
    • https://kueapem.com/contents/files/65726120179.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/afuvoa3ldg9v75svqojshbsem1/xegebevasew.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/d2qa75r2v50ok92hom94djb5a4/72548715106.pdfIn PDF document text
    • http://unitekinfostructures.com/userfiles/file/6426520628.pdfIn PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/kijodafiwejeluvujutiziv.pdfIn PDF document text
    • https://mbamantra.com/ci/userfiles/files/87983063967.pdfIn PDF document text
    • https://sthouseluxury.com/upload/files/rurivivixarugufeve.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/varotukozugemojo.pdfIn PDF document text
    • http://hanahana.vn/media/ftp/file/lexovobopipesirawazipe.pdfIn PDF document text
    • http://residencecarlofelice.com/userfiles/files/3204390529.pdfIn PDF document text
    • https://kamionosnyelvlecke.hu/userfiles/file/92333360186.pdfIn PDF document text
    • http://sensi-leszno.pl/userfiles/file/23455174465.pdfIn PDF document text
    • http://misterholidaysanprisco.it/userfiles/files/bezasanupabisuja.pdfIn PDF document text
    • http://garage-ys.info/js/upload/files/jofupavepatavolos.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/zinawa.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16134176e998be---govadonobozozaxomapebes.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/kerenozonuwur.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/aa00bd1d872fd6e21866ee9123e30fee/magobojopanojujidobepemuj.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/xakafegivilipowikij.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/xusuniwageli.pdfIn PDF document text
    • http://tokyo-sanritsu.com/userfiles/file/72493982877.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/902758194.pdfIn PDF document text
    • https://bestcoloringpages.com/userfiles/file/90906319132.pdfIn PDF document text
    • 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_off0000ee06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE06 10800 bytes
SHA-256: e8f4a2c0470abc4494c22cba383198b18296d87ba8a178da25317cea3448a4c0
font_01_sfnt_off000106f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F06 19900 bytes
SHA-256: 06a82b0eabdf7d59cf3d061ea3c58fb1c62d07ce6231ec49ee01a150eaf28e30

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