Malicious PDF — malware analysis report

Static analysis result for SHA-256 c24bb75e977d1049…

MALICIOUS

PDF

77.6 KB Created: 2021-09-13 12:02:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d742a06080a48f88ae7a5d707d6f0df3 SHA-1: 7e15214fa69f34183b164b8fab7156d5820cf5d9 SHA-256: c24bb75e977d1049ff2713cfab27da56330d4b4360f2dd7d0d34eccda341af55
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of multiple compromised CMS upload links further supports this assessment. No scripts were extracted, but the primary attack pattern involves directing users to external, likely compromised, web resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

Heuristics 5

  • 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.
  • 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://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/ba2ec520edcc10bd2b20660127ede52d/mawejevelixemumezaveja.pdf In PDF document text
    • http://ontis.sk/editor_uploads/system/files/43096264445.pdfIn PDF document text
    • http://sccsfz.org/upload/2021-09/1613174203.pdfIn PDF document text
    • http://www.atsamuihaus.com/image/upload/File/tawebadusigis.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/xijal.pdfIn PDF document text
    • https://butyfarm.mm520.net/userfiles/files/wewisifimajixekosenukomos.pdfIn PDF document text
    • http://churchtextile.com/userfiles/file/texubojuteragogo.pdfIn PDF document text
    • http://nhatrangpalace.vn/app/webroot/upload/files/muvodumabafatefus.pdfIn PDF document text
    • http://studiozammuner.eu/userfiles/files/vimuxadamumimod.pdfIn PDF document text
    • https://bike-accessories.supersites.gr/content/ckfinder/files/gobelezawijujavisuturapa.pdfIn PDF document text
    • http://sipzip.com/userfiles/file/vuwawewusutitebexikitu.pdfIn PDF document text
    • https://edinburghpools.com/contents/files/vesubefef.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613e269f5e6fe---rifufifotilapetim.pdfIn PDF document text
    • https://curvy.tw/upload/files/959100058.pdfIn PDF document text
    • http://chiangmai-esc.net/user_img/files/liwinevomuxosuzabo.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/7adda1eed08691c88507ac4b80a4a34a/xugijepafebasofetekoz.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/q7prki11jj90vv8c1nfdj1vr1e/24019306841.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/klp5k1mdbtvtl2sf4f28d25tmr/51688781034.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/1717394542.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/loxifabesabe.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/e8cmepha1j2k3jmq3c1iequon3/xozomakog.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e1278858a---98547051551.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/fimirafuforazi.pdfIn PDF document text
    • https://belitour.ir/basefile/belitourir/files/fanududide.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wubigipasekumijoluvimupi.pdfIn PDF document text
    • http://nbmounts.com/userfiles/file/1631495062.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=snow+wallpaper+androidPDF 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_off0000cab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAB3 18244 bytes
SHA-256: 7eaadac3f3910f76865c3174986de82716f6822879819c46af6fb28cdc2f6231
font_01_sfnt_off0000f9e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000111f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111F9 10280 bytes
SHA-256: 80f48977ed1eed888e5563e93b2f78ad1218b5d3f9782014447c0f2558799a90