Malicious PDF — malware analysis report

Static analysis result for SHA-256 54a39cb50d0aaf3c…

MALICIOUS

PDF

70.5 KB Created: 2021-09-10 20:47:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ccadd68c34a325b4c9b080af253e496f SHA-1: 984fc63c7ca1648cfab5c12a35f51564db26a7ad SHA-256: 54a39cb50d0aaf3c8bd5767a5e214d4d4399074a42584c6074b68474231ff88d
104 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is likely used for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.enjoyvaltellina.it/admin/ckfinder/userfiles/files/41720566740.pdf In PDF document text
    • http://ankaraeksioglu.com/resimler/files/zupalere.pdfIn PDF document text
    • https://showdetango.com/bafa/userfiles/file/65673912404.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a4478d329c---95764193257.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/f6da0127b603ca805f84423f86f059f2/fogeni.pdfIn PDF document text
    • https://magnettoptan.com/upload/ckfinder/files/57536918053.pdfIn PDF document text
    • http://izhar-energy.com/userfiles/file/vuzozerorogogorepaja.pdfIn PDF document text
    • http://cserepakcio.hu/xdata/file/16126125687.pdfIn PDF document text
    • http://holdemigny.fr/ckfinder/userfiles/files/borosaj.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/73216820656.pdfIn PDF document text
    • https://klubkanine.com/home/klub/public_html/ckfinder/userfiles/files/jolivevobesudime.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16132cbff7edcd---80327275268.pdfIn PDF document text
    • http://ncteonline.com/userfiles/file/pulur.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/nifofizovowomenok.pdfIn PDF document text
    • https://webmenuplus.com/images/file/56278744169.pdfIn PDF document text
    • https://irastuff.com/admin/ckfinder/uploads/files/93483567954.pdfIn PDF document text
    • https://cristalparkhotel.com.ve/ckfinder/userfiles/files/52212265234.pdfIn PDF document text
    • https://pastelbuilders.com/userfiles/file/57333158348.pdfIn PDF document text
    • http://ipcmanpower.com/admin/style/images/userfiles/file/72502754940.pdfIn PDF document text
    • http://mousike.it/img_ins/files/24927208852.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/delowejapa.pdfIn PDF document text
    • http://sjmhospital.org/files/js/ckfinder/userfiles/files/sutezigu.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161357e38625fd---39436179502.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=inductive+and+deductive+research+pdfPDF link annotation
    • https://tes-sys.com/uploads/ckfinder/files/20210908/16310588852484.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_off0000b55a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB55A 10668 bytes
SHA-256: 4c9dbdb4532759c2fb859da8f2cba3186826d0d4979ca6ebdcafe00d6321a917
font_01_sfnt_off0000cdc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e5d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D7 15380 bytes
SHA-256: 301f5dea5b739f04423cf6d366984595a88077198daadbcd3e7f6d20c212e2c6

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