Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ea3cc90866897ca…

MALICIOUS

PDF

83.6 KB Created: 2021-09-19 23:54:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 60b1b2d93e925d2883b5d51585a61910 SHA-1: 8752aadd9f9454a3e415435e77267668f040a81f SHA-256: 4ea3cc90866897cae7287c7f59ce3634c24957ca8a7d618270f8bf7a43b428e6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code. The heuristics indicate that the document is part of a link farm, directing users to compromised WordPress sites and disposable hosting. The embedded JavaScript likely facilitates the redirection to these malicious URLs, which are designed to lure users into downloading further malware or providing sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://archism.ru/uplcv?utm_term=hack+roblox+happymod PDF link annotation
    • http://saveondealz.com/ckeditor/ckfinder/core/connector/php/uploads/files/bowisifanogejasukovarax.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/9468827225.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130bd97eee12---46721554986.pdfIn PDF document text
    • http://salt17.com/userfiles/files/tusixevosexikugamu.pdfIn PDF document text
    • http://gioiacompany.net/images/upload/file/4716424978.pdfIn PDF document text
    • https://dangeloremodeling.com/nbloom/fckuploads/file/pewuvipugokote.pdfIn PDF document text
    • http://cattaneoarchitetti.it/userfiles/files/zoxizetos.pdfIn PDF document text
    • http://baruraprotidin.com/assets/ckfinder/core/connector/php/uploads/files/36536263963.pdfIn PDF document text
    • http://atanasijornet.net/uploads/ckfinder/files/24180965361.pdfIn PDF document text
    • http://due.pt/js/ckfinder/userfiles/files/37866984412.pdfIn PDF document text
    • http://drxzhang.com/userfiles/file/77143396128.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff64977613---32743750152.pdfIn PDF document text
    • https://www.funes.gob.ar/ckfinder/userfiles/files/xesajokes.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/f2e33e8dbdd940acf28059dfe5d692ae/87427498020.pdfIn PDF document text
    • http://mirai-kankyo.com/userfiles/files/resenuvasegobep.pdfIn PDF document text
    • http://herve-coiffure.ci/files/zelojijetakakekuga.pdfIn PDF document text
    • https://educhina.mn/editor/files/mibifugob.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/75157d1878765665c134c578eca40190/rusetafamorifixinevi.pdfIn PDF document text
    • http://hcvitamin.com/webroot/img/files/72121348462.pdfIn PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/62040698968.pdfIn PDF document text
    • http://cmtdental.com/upload/ckimg/files/2298751021.pdfIn PDF document text
    • http://7sate.com/filespath/files/20210919002927.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_off0000e174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE174 18084 bytes
SHA-256: 4dac0fadbfe90661357231783f729d469e98a8e9fe61188dc5ac0b159fe60034
font_01_sfnt_off000110a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110A2 10624 bytes
SHA-256: cdf6dbb7b9552994c62a6a550d738d7f93b0bf6124cd8600b7fd68da92e897f8
font_02_sfnt_off000128af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1