Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8c88e9daa342414…

MALICIOUS

PDF

69.2 KB Created: 2021-09-14 16:32:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e95a445be8a4776b7787b24adc0a0929 SHA-1: 86f6c855438b38a24ac8ea6f7d1e8cdd60f779f1 SHA-256: f8c88e9daa3424143263ae54ccec115bef24239291ccc63caf3b1f908a6f6834
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm for SEO manipulation or malicious redirection. The ML classifier strongly flagged this PDF as malicious. The embedded JavaScript likely facilitates the redirection or interaction with these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://issaproject.com/app/views/panel/ckfinder/userfiles/files/59501580674.pdf In PDF document text
    • http://neo-net.info/giganet/files/file/mozofuluxigile.pdfIn PDF document text
    • http://stphilomenaonline.org/userfiles/file/79576805070.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/41d1edsgi50sds3fvlhjjrqcl1/20589365012.pdfIn PDF document text
    • http://www.fishandcosolicitors.com/uploads/files/24646268113.pdfIn PDF document text
    • http://bogaarchitetti.it/userfiles/files/82458465464.pdfIn PDF document text
    • http://zuche0551.com/upload/file/25402844476.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613394604d950---vosubizozupotalarigor.pdfIn PDF document text
    • http://standdominica.org/files/files/26807539880.pdfIn PDF document text
    • http://bona-agra.pl/Upload/file/xuruga.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/dupiv.pdfIn PDF document text
    • https://enkaotomatikkapi.com/depo/sayfaresim/file/16987904305.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16133e292a810d---3890468526.pdfIn PDF document text
    • https://santchavarabed.in/ckfinder/userfiles/files/nokutixuzujexafid.pdfIn PDF document text
    • https://ateliersmq.com/pevron/www/img/file/56346407732.pdfIn PDF document text
    • https://svarovanijelinek.cz/ckfinder/userfiles/files/21657327137.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-9-13/20210913150419415620.pdfIn PDF document text
    • https://amzentransportationindustries.com/admin/imagetemp1/file/53805158434.pdfIn PDF document text
    • http://ambulatorioveterinariomariani.it/userfiles/files/ropanim.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-9-7/20210907012724165497.pdfIn PDF document text
    • http://thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/gumew.pdfIn PDF document text
    • https://chetanaus.org/bheru/uploadfiles/file/17597748177.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/060b3040822435421ac777803978fc37/89430777156.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/161358ae560158---35056471799.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=custom+keyboard+android+source+codePDF 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_off0000b17e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB17E 14296 bytes
SHA-256: 5bf8765677a40a7e5827eff4cfa88189773ebb0ede0f9af35bb71ba1f6b25d7a
font_01_sfnt_off0000d5a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000edbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBC 10964 bytes
SHA-256: e92fe2eb3971cc3e754c6653043afeac36b83fb1ab18d0aca560b2fcb0ee7c24