Malicious PDF — malware analysis report

Static analysis result for SHA-256 c321ad9b3bc8983d…

MALICIOUS

PDF

83.6 KB Created: 2021-08-20 18:58:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f49978c9563c5c468e8164e932ef2d61 SHA-1: 5ba48ac7c73de42ce1db77985bb6914ef6df10a5 SHA-256: c321ad9b3bc8983d8d8d337a5d839213f237639dc0b73edcbc5400f7fb95dbcb
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body is heavily obfuscated, preventing a clear understanding of its direct user-facing content, but the heuristics and URL analysis confirm a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/5baac11d69d3985ca31378acf8c603fc/94992830013.pdf In PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16091774f3a90f---313556582.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16078ac2b20b17---jegamojokitepemidiv.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/89804489781.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/24851764221.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2c8ef1097---1146110656.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/wukonam.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d620d4b1fdd---23530704908.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/65608663194.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607a26c10133b---29428183171.pdfIn PDF document text
    • https://rosewoodcity.org/nbloom/fckuploads/file/28549050391.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/a9053d66db80b83bc16bae55809e132d/17017530852.pdfIn PDF document text
    • http://papaicountrylodge-longstay.com/user_img/files/digugan.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/915epb042crtdeqlekhsc8ui25/sarerulazekogufuw.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8261a6b009---lewanakikova.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/698ihmnukcvt24m1msm14asuu0/16807306649.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/a019f4ec4e641c296c541f09e7dc2740/65112885993.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/29832468559.pdfIn PDF document text
    • http://inarchengineering.it/userfiles/files/63001437391.pdfIn PDF document text
    • https://proxus.nl/file/zapaviraxiliwi.pdfIn PDF document text
    • https://www.hermanosvalerorecio.com//ckfinder/userfiles/files/wadetixemuridubiwimana.pdfIn PDF document text
    • http://st-ark.it/userfiles/files/10308952129.pdfIn PDF document text
    • http://thankschicken.com/uploads/files/46110797683.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=wichita+ks+police+department+arrest+recordsPDF 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_off0000e304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE304 10864 bytes
SHA-256: 0bcd4e5ce9158fed27badadedc1efd47dc3c6bed4ae43eb5cc8815fa73c77065
font_01_sfnt_off0000fbf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBF9 16672 bytes
SHA-256: e17fe6b71c8bf7a4f3f732c6b088126c53723a2ab3dab79f79e7682bbbcfa1a6
font_02_sfnt_off0001272d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1272D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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