Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fadac67587b449a…

MALICIOUS

PDF

76.2 KB Created: 2021-09-13 20:04:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a256fe3cf8e214d698de67e9a57af7c8 SHA-1: ea0bfd852b24d948428a81df1c72c42d9d733739 SHA-256: 9fadac67587b449a4c523cdabbc2e4cd7ae56cc59f08ac04e26c222153260a08
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for exploiting vulnerabilities or delivering malicious content. It also hosts numerous links to compromised websites, including a WordPress upload directory, suggesting an attempt to redirect users to malicious sites or download further payloads. ClamAV detection and ML classification strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.pharmawell.eu/ckfinder/userfiles/files/tibudezadarajajalepusa.pdf In PDF document text
    • https://tahubunting1.com/contents/files/44560036496.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/jadilopik.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/16253916058.pdfIn PDF document text
    • http://cukorbetegshop.hu/files/genukerenukoxevupirom.pdfIn PDF document text
    • http://cuborh.com/natelinhanew/js/ckfinder/userfiles/files/4307591587.pdfIn PDF document text
    • https://foundationkuzmanov.com/files/26205158739.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16132c7bb5a5cf---41868486412.pdfIn PDF document text
    • http://iberia-ex.com/images/blog/file/2039392036.pdfIn PDF document text
    • http://erpos.sk/data/files/wezekiminu.pdfIn PDF document text
    • http://thebookmarkcafe.com/uploads/files/40247265145.pdfIn PDF document text
    • http://angel-conference.org/upload_fck/file/2021-9-1/20210901120352634652.pdfIn PDF document text
    • http://89928386.com/uploads/files/202109131019395308.pdfIn PDF document text
    • https://fainitelecommunication.com/public/editorfiles/file/24690668464.pdfIn PDF document text
    • http://www.moyekolodin.com/files/gesenibujotekopidujosef.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/74553742141.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137cef162c72---40188243832.pdfIn PDF document text
    • https://agrando.cz/files/file/9044455137.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/1446e6287cfd3a48542e5cd713a47ae5/bojuwelufuka.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/17880180993.pdfIn PDF document text
    • https://czus-lukasa.sk/userfiles/file/jinomabovajaw.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/nivibexeridabezujarif.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/vesito.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16130a6d71706c---gakujajuwirikuzu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=find+the+domain+of+tangent+and+cotangent+functionPDF 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_off0000c0fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d910.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD910 19004 bytes
SHA-256: 17ac163f6bebd9dc9488170f3c18f05b39221f5bd1f1a3eeedb926b315c25bd5
font_02_sfnt_off00010a8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A8E 10688 bytes
SHA-256: 8651950bfd361808c390fad9561063bf8f033072dfe23b1d99b3b6ebde5264f7