Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf33ddb24f518a8c…

MALICIOUS

PDF

79.0 KB Created: 2021-09-09 10:02:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d326d2defd554f7db13d3e094983bb60 SHA-1: 56d12469b55af4016dc7ab459ef916798147e8db SHA-256: bf33ddb24f518a8cab8507074a4ffb413d5c7547618117e31868b2ba81a7844d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which are hosted on disposable domains or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://panel2conso.com/userfiles/file/13808498656.pdf In PDF document text
    • http://www.tomasjelinek.com/img/pub/file/85422479319.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/kupabutupaboluzola.pdfIn PDF document text
    • http://malir-naterac.info/UserFiles/File/212129957.pdfIn PDF document text
    • https://www.privathospitaletkollund.com/ckfinder/userfiles/files/11947348955.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/woxemikasorukewuxofunin.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/ruxufizizelizabowiwe.pdfIn PDF document text
    • https://ctapigroup3.com/contents/files/vejodaw.pdfIn PDF document text
    • http://mamnonsaokhue.vn/app/webroot/files/ckfinder/files/talagigadexa.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed199bb088---7238848791.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/161396ca64f93d---71549279042.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/busegajisibiwuvararo.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/11085cd714cd32eaef4c6a1d3ede4531/76636495879.pdfIn PDF document text
    • https://blugarden.eu/file/didabunebuxagadotevepomuz.pdfIn PDF document text
    • https://ezokniga.com/uploads/file/pomuwesawulonowenisaziri.pdfIn PDF document text
    • https://rh-h1tapi-turbo.com/contents/files/91606659923.pdfIn PDF document text
    • https://sharenkon.com/files/muwovevagerixepifobalazik.pdfIn PDF document text
    • https://minervatech.work/js/ckfinder/userfiles/files/sedajuxopir.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021090122164973499.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/namadox.pdfIn PDF document text
    • https://vwb.mrv-educationservices.com/content_file/files/rukuwujuze.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/81008848358.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/vazatoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=top+10+naruto+wallpapersPDF 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_off0000d1ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1EF 17464 bytes
SHA-256: 7e99e14dc3c5969b414e79fc3294db8adca8c79c185899c8e76361ca366fcf7c
font_01_sfnt_off0000ff35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001174c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1174C 10476 bytes
SHA-256: 687b1cb374301fef1a796258033aafd137f5e3533941c1558ade7b679f96b38d

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