Malicious PDF — malware analysis report

Static analysis result for SHA-256 d953045fdc9a44b6…

MALICIOUS

PDF

73.5 KB Created: 2021-09-20 22:59:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d81fc426a113f47d163b2a4a4a055655 SHA-1: 8774b494f11b65607ae98a04e43b611f324d4b3f SHA-256: d953045fdc9a44b6e0e511f2ab1c0ada55b16e2c632a6e3a82a63a4ddd028dd2
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the heuristic firings clearly point to a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://drbumbnursinghome.in/ckfinder/userfiles/files/tiratikevoziboxosetikevu.pdf In PDF document text
    • http://jonkmp.nl/img/cms/file/babidito.pdfIn PDF document text
    • http://ppfi-online.com/userfiles/file/97877535454.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/zojuzisozujotewijunalote.pdfIn PDF document text
    • http://mudrkanuch.sk/editor_uploads/system/files/belebivejibudadepeb.pdfIn PDF document text
    • http://xn--80aadcnaeutgftohcogh8i8dsc.xn--p1ai/pict/file/26882998251.pdfIn PDF document text
    • http://faurerom.com/userfiles/file/58816323049.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e2b0e78b89---sajevamumemalekavofob.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/7ks9nsu5ec4ek1pon4uci5v0le/3072084068.pdfIn PDF document text
    • https://www.ftha.org/admin/ckfinder/userfiles/files/12332387467.pdfIn PDF document text
    • http://proallprint.com/userfiles/files/14622129165.pdfIn PDF document text
    • http://tomasmrazek.cz/userfiles/file/33278472558.pdfIn PDF document text
    • http://hidrometa.com/images_upload/files/winodaxim.pdfIn PDF document text
    • http://abwingsde.com/uploads/files/manadifuneb.pdfIn PDF document text
    • https://macroedunet.com/userfiles/file/35173118458.pdfIn PDF document text
    • http://latiendasegura.com/contable_prueba/userfiles/file/48680430551.pdfIn PDF document text
    • https://giaiphapthietke.vn/media/file/files/81250820500.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/17591900195.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zexet.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/zekejebakarikadu.pdfIn PDF document text
    • http://bigdoughpizza.com/uploads/files/49035185759.pdfIn PDF document text
    • http://donovaly-ubytovanie-safran.sk/web/userfiles/file/zebib.pdfIn PDF document text
    • https://cfacgroup.com/uploads/FCK_files/file/filenamofigozabiluvimota.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/0960609da49362ab9bc051b1753dd6cd/59754759129.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161459bdb0ef53---17107290823.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/fakex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=apppackage+and+appactivity+in+appiumPDF 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_off0000bb72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD389 10776 bytes
SHA-256: d156690b63ac361cdfc5419393be78faff2b991267ff9a402f24c8fd31b040f6
font_02_sfnt_off0000ec3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3B 17184 bytes
SHA-256: 0c97bd5061d4d5f2aafe5d60f4827b5854c581dd572282598e28efa88b6e4734

Open this report in the interactive analyzer, or submit your own file for analysis.