Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b9e817fd0d5a5f7…

MALICIOUS

PDF

96.4 KB Created: 2021-09-04 10:01:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0034b2a1634779c68fa4752891cdd2ee SHA-1: c4f616b3167d5e0fb84173cfd89b70f87619325b SHA-256: 9b9e817fd0d5a5f704cee109f3ab2c60502fcdacdba29f15cf71e566b1269eeb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to potentially compromised CMS uploads. The embedded JavaScript likely facilitates the redirection or execution of further malicious actions. The numerous URLs hosted on various domains suggest an attempt to distribute malicious content or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/2bf124327c3ad3596266352704ed2525/19734619806.pdf In PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/lmvormrjo1ga7m9jof0rou0aa2/77752711071.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c546c0b5103---89563929932.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/72518944435.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/22c49a1fa9f35fe13ee1e9f5b492d266/81560535959.pdfIn PDF document text
    • https://homecareangels.ca/files/files/files/4850337461.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7c6aa35f8---41378398591.pdfIn PDF document text
    • http://brianhaymore.com/images/e/file/jarewekawinijud.pdfIn PDF document text
    • https://ivanamihic.com//files/virarerovegorabo.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/c2f448e3cb0388d2157878611caa0e79/sosewitujimimuzofevo.pdfIn PDF document text
    • https://konferencii.ru/js/ckfinder/userfiles/files/gonazez.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d4ced2837bb---85459536800.pdfIn PDF document text
    • https://vitanov.rs//files/kovagijapoketule.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/parikutufibobud.pdfIn PDF document text
    • https://e-lightingcontrols.com/wp-content/plugins/super-forms/uploads/php/files/d89ae0d8e9d9253b0597118dd1d4ac7d/60009025532.pdfIn PDF document text
    • http://fontanarosaserigrafia.it/userfiles/file/46161744541.pdfIn PDF document text
    • https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/aa509c70b0488ce4f571f008349dd4e3/86607030825.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16112a80080152---87015415441.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/13651557406.pdfIn PDF document text
    • http://beta-rc.com/upload/files/38601486229.pdfIn PDF document text
    • https://parfumzone.ro/files/file/zomegapizidifoj.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096a91148ef8---fuvesexesixupoxijaxivo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=idioms+and+phrases+book+for+ssc+cgl+pdfPDF 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_off0001134d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1134D 11152 bytes
SHA-256: dc240f07af45e5838308f8a4069fa467aff4e0aa4847daff5cbdc48331e965d6
font_01_sfnt_off00012ca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CA1 18168 bytes
SHA-256: 79c67356072c2cf195dc02edb89a3893c147f69eeb46134d7448235ac001c386
font_02_sfnt_off00015bb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BB4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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