Malicious PDF — malware analysis report

Static analysis result for SHA-256 a43e86fd0f6f4568…

MALICIOUS

PDF

83.6 KB Created: 2021-09-02 22:50:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a8630de586607053b06171f3995a9d51 SHA-1: 2b706da0b96a3ed09d9c9c7e4c4221352b6c7a60 SHA-256: a43e86fd0f6f45684c0d7685e9ef4393af301ec05481b1e37d14f33c86bf9161
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to multiple distinct hosts, some of which are compromised WordPress uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded JavaScript suggests an attempt to execute code or further exploit the user's system.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • 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 https://ideylia.fr/uploads/file/630651171.pdf In PDF document text
    • https://cristalparkhotel.com.ve/ckfinder/userfiles/files/34098429058.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/fitem.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608fb4329f182---64081773925.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/838a5ecd34451fbfb36ee8ee01c688f5/lowelegitasenozevara.pdfIn PDF document text
    • http://strap.sk/uploads/files/barosejapinugagaxetukaf.pdfIn PDF document text
    • http://daiduongmetal.com/uploads/ckfinder/files/bizovitodifazasi.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/bevusupogarurexeka.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/eefb8bb4287cc45e6b39d3efabc5f9c3/90835586333.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/supoteraguzibix.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/fanamubuzonolosumepaf.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1608150b26df3c---nugilusekusiliwebutudide.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/je0akodqvfotj4vnrd34rle782/zakemadojivipuli.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc4f9b84f4d---dikaxilepipin.pdfIn PDF document text
    • http://fd-health.com/upload/ckeditor/files/lewemerarumukoburozozibu.pdfIn PDF document text
    • http://sk-massimo.com/js/upload/files/madagojudaradeferukabas.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/75ac0b20d08d61ee4419a135f54e02bc/jimebadofetojiji.pdfIn PDF document text
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/43865386904.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/162g64t02u8g0kl9o571i72914/94639405648.pdfIn PDF document text
    • http://apexibd.com/uploads/fck_uploads/file/bebazupopopawizigumex.pdfIn PDF document text
    • http://aexpress.lv/index/images/up/file/xebuxowupofivot.pdfIn PDF document text
    • https://kocarbon.vn/luutru/files/gibimajodejiwinakujipubez.pdfIn PDF document text
    • http://fxmeat.com/upload/file/d4e257c94d8e215d563bcf9bdd081812.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/12494280475.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/c722c39a1a21cd7a59760fe95a7a67fa/vuvisiwikejaga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=uhc+community+plan+nebraska+provider+manualPDF 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_off0000db2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF343 11300 bytes
SHA-256: 34fa79b04e1a416aa7a33161b64e5c22b846e1cf57499117be9ecd759f58fa4d
font_02_sfnt_off00010d69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D69 19912 bytes
SHA-256: c6a6d803f1659e47bd91ebfeeb3b1eed678b7997a83c15de5d9626230549db6e