Malicious PDF — malware analysis report

Static analysis result for SHA-256 f45857a0fb26ab61…

MALICIOUS

PDF

72.2 KB Created: 2021-09-27 09:16:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: a960cf76259cec2dc6d98fdca43bfbb1 SHA-1: c0428fc7b1e4ec3939b39867195dee24a0713f13 SHA-256: f45857a0fb26ab61f011e89404dd3e97fffe24787c6e2753a8c97a5643876f88
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these external sites, which are characteristic of phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://slbreakingnews.com/ckfinder/userfiles/files/tipukubusunewip.pdf In PDF document text
    • http://fiorenzuolatrack.it/userfiles/files/sokowebemasinagoxule.pdfIn PDF document text
    • https://bawauang.com/contents/files/7956755461.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16130e8737224b---83885286400.pdfIn PDF document text
    • https://eyescare.vn/app/webroot/upload/ckfinder/files/tepipeduvatilovuva.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/vopuvibibofugivakanako.pdfIn PDF document text
    • http://gardenofsound.com/userfiles/files/3352390087.pdfIn PDF document text
    • http://perfekt-dom.pl/designhome/admin/userfiles/file/85573250312.pdfIn PDF document text
    • https://akemi.ro/hirek/file/xebusom.pdfIn PDF document text
    • https://pacientes.quiroser.com/UserFilesQUI/file/38639271527.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/0268a85d554fde0fb77dede331bf0145/26890219316.pdfIn PDF document text
    • http://tourhong.com/FileData/ckfinder/files/20210917_A3E03AB36B9B5552.pdfIn PDF document text
    • https://tivirtual.com/userfiles/file/42332947222.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1614fc0de8cbc9---delosufenugivemevufobu.pdfIn PDF document text
    • http://beijingteye.com/upload/files/sizabevotubuliresivu.pdfIn PDF document text
    • http://lagunarent.lt/ckfinder/userfiles/files/90621999491.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16136cc53ac3df---39216841574.pdfIn PDF document text
    • http://gpsputhuppally.com/userfiles/file/rogesozetidise.pdfIn PDF document text
    • http://hakasasi.id/userfiles/file/6283882033.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/41828650605.pdfIn PDF document text
    • http://clinicaveterinariacene.com/userfiles/files/65970918585.pdfIn PDF document text
    • https://bankkartya.hu/js/ckfinder/userfiles/files/pibevarax.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/161464b04dad8a---watevejapusegida.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=weather+and+clock+widget+on+home+screenPDF 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_off0000b332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB332 10988 bytes
SHA-256: b7771e65d8a4c4dd80c82025eb0cfbf4107dc2b12ec5775b5fa30796f0eb0b07
font_01_sfnt_off0000cc5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC5A 18240 bytes
SHA-256: 22bcaca041a51510728706bda3e385ea8f342a53424086458e70b951011f8cb1
font_02_sfnt_off0000fb32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB32 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1