Malicious PDF — malware analysis report

Static analysis result for SHA-256 df4acd49ae6c01e2…

MALICIOUS

PDF

73.4 KB Created: 2021-09-01 10:18:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 77767543dce6ff3bbeafa7fe1c52e47e SHA-1: 286193169848cfc90cd2ba0ac3582f474b1b3dd2 SHA-256: df4acd49ae6c01e225af6af3119f3f47935fb3bd7b503917205eea94bac0bb8e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDF documents. It also features numerous external URLs, many hosted on compromised WordPress sites, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://ahreco.com/uploads/news_file/kowomabafosodidin.pdf In PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/1e5f86690fb3aaa06232c1aa5791a7a8/pumuburozokekiduwozotul.pdfIn PDF document text
    • http://detikakdeti.ru/img/file/28621306021.pdfIn PDF document text
    • http://xn--80aafmoni2biho.xn--p1ai/admin/ckfinder/userfiles/files/59759860852.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a800da9091b---lusejodivifavitixuvuruni.pdfIn PDF document text
    • https://tomorrowhubs.com/upload/users/files/tibawudogagolabipi.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160837118c9b1c---fovelamup.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e0fdae0384---wetebeduronafabamuxuxasar.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/wixigezodetadegoz.pdfIn PDF document text
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/711d9ad35ebd4adacb109d69bac5868f/31757410166.pdfIn PDF document text
    • http://contelex.it/userfiles/files/17235967112.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/vinepinumanololudujusu.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/lfjl1c86ks41l9hq30mdm0d3og/fezafovor.pdfIn PDF document text
    • http://consade.com/userfiles/file/34723744661.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/0e1i3l62i8bb8mhfdjb784hlpj/85179763585.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/xotinu.pdfIn PDF document text
    • http://tokyo-sanritsu.com/userfiles/file/33063180403.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/dee20056f4b8e536170e31f92260e3ed/korukasanikepulu.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/dc3c4092f2f64e479f1f9a18146fcfe8/kowuragutelototipewuz.pdfIn PDF document text
    • https://flardochform.se/userfiles/file/5452179977.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/jk4vfsgenmiu6qmbhht63brmo4/65749811106.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=boards+and+wards+pdfPDF link annotation
    • https://grupo.iberia.com/js/ckfinder/userfiles/files/29219857705.pdfIn PDF document text
    • 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_off0000c0e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0E9 10264 bytes
SHA-256: f45515b293fb6feef863b4bb967c01a1959aeb016647cfda0b20bf175888a60b
font_01_sfnt_off0000d825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD825 15436 bytes
SHA-256: 9ca597fb669327429d044e72695fa32835a7c351f6859a5a2d23326983b18b04
font_02_sfnt_off0000ff36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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