Malicious PDF — malware analysis report

Static analysis result for SHA-256 cac0c8f4ae505e12…

MALICIOUS

PDF

87.3 KB Created: 2021-08-07 21:06:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: fc1e7f285a52a52b7d4afbfe35a1d367 SHA-1: e2b605184f7b7c2ee8870889869d20b5e355c5cd SHA-256: cac0c8f4ae505e12e029e03725fdb38a0c05d9d8d3743b15713b125f469f6bc2
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content or for SEO manipulation. The ML classifier strongly indicated maliciousness, and the presence of multiple external URIs supports this assessment. No scripts were extracted, but the document's structure and URL distribution are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 https://ketchas.ru/uplcv?utm_term=free+skins+fortnite+xbox+one+2020 PDF link annotation
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/7dabe4vstokq1l9jke1gphqc00/dulasilekobajopafimak.pdfIn PDF document text
    • https://semut73.com/contents//files/lutibarulirujozuleruwuzi.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/7g5917i3cs3guj1k6m2acvrseq/68262301367.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a8a2447eab7---44040566629.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/tm8n8r0eui4ca4tp6r7vp7e2vm/xabulitunupo.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/koxejuzajaselowimovuti.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/tozowokitepatazutuzagutes.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b915beb6a93---zatosobed.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f133ff2bc75---50573599881.pdfIn PDF document text
    • https://ladangmimpi2.com/contents//files/babozodozagulurix.pdfIn PDF document text
    • https://opsclown.it/ckfinder/userfiles/files/xixirakisaxuxadijeru.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/eee8f804ae4c8d0c86c7c221b1059743/rudekuvavigimumiwidela.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3b5604e5a---fobazesidi.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609204301e4bc---19183093944.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/70b1b6a45d675c95787683200eb3db63/zikadovodunigakogifa.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/paget.pdfIn PDF document text
    • https://topjobsnepal.com/ckfinder/userfiles/files/votosudixuganidelaj.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160868fc4e60d3---konogejesi.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d56355a44f2---11996061495.pdfIn PDF document text
    • https://epiphanych.com/images/file/zigoxidepudel.pdfIn PDF document text
    • http://arniestribu.com/campannas/file/nuwefufora.pdfIn PDF document text
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/079f869aabfd481104cd728ef788ddc9/wotawoliboxusigijuve.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_off0000f39b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39B 10552 bytes
SHA-256: c83ad181b14639adab6483301c8f5a3d4d456b51c85aee50ff61bb5e5d0f5423
font_01_sfnt_off00010bd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123EB 16744 bytes
SHA-256: 18d410ed188537ac8014a3acd633bbad1bc2d560418c55f0a32751210233d4ae