Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8c0b05c0c151a2c…

MALICIOUS

PDF

84.1 KB Created: 2021-09-04 23:48:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4e8c731735f3630a5193e0349de7a101 SHA-1: a4d889495eaa25bb0a7b02f602896df1021078d4 SHA-256: b8c0b05c0c151a2c2ce43e47114fdd020abd39c298ece2afdd49faf4d2f0db12
164 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting, strongly suggests a phishing or malware distribution attempt. The ML classifier output of 0.997 further supports the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://eschool365.in/js/admin/uploadfiles/file/2141965007.pdf In PDF document text
    • http://aotem.com/data/home/qxu1780220113/htdocs/uploadfile/files/71335137570.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/35f9e811c3cae87a38ff6f9375549f5c/57473124137.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/160cfec2d6656b---63620582586.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c52e4b5561b---dubiwubagu.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/mumikekexulivafofabif.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/thtnve5lt7fe2q6er4lqr0iec3/65010080375.pdfIn PDF document text
    • http://zajazd-broadway.pl/galeria/file/vipapupu.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/969671499.pdfIn PDF document text
    • http://zaun-produzent.de/userfiles/file/51465624328.pdfIn PDF document text
    • https://amigo-shop.105h.net/upload/files/bizakotavefup.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/84bde3b1fc3c5f9f58176bb3e03d9fee/pizim.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/58956006726.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/2qd6b1lc82g8uoo3tvt2timoet/luranupur.pdfIn PDF document text
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/xejoxewe.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/jesopivosamemurudoveneju.pdfIn PDF document text
    • http://webdulich.com/js/ckfinder/userfiles/files/nagozi.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/71915958655.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/177e674c38bb99c463ca86855a0c893f/fosuzes.pdfIn PDF document text
    • https://podimercrm.com/img/files/6266450015.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084b598c89af---rikezu.pdfIn PDF document text
    • https://kildevangen.dk/files/mamona.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/90hh8tnm53dpsktlvgecur2ls5/89679722170.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/23211685722.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/wozumevifepupufi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=foxconn+n15235+user+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_off0000dfe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FF 10860 bytes
SHA-256: 756a52cb08fa4f86568bdc7ec8786a2a0f95d703589a16e01ca7ef5ae93779f6
font_02_sfnt_off0001113b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1113B 18912 bytes
SHA-256: 3d5ead5c078c82f28baa9862d89181cec5317ce36b788cbc8b7a783a0c2328f5

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