Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ced3ad4b3667ca0…

MALICIOUS

PDF

76.4 KB Created: 2021-09-20 07:19:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6145dbb6cbe487142bffcc108ef2d1ed SHA-1: 8d5f2ae0f4e5b347d3b14d3de18c79245c37d737 SHA-256: 3ced3ad4b3667ca0ed53fcdd71dd6439194e3b6c549f0042baad8d32d77864df
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document's primary purpose is to act as a link farm, likely to distribute malicious content or phish for credentials. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://irlanc.ru/uplcv?utm_term=money+tree+city+mod+apk PDF link annotation
    • https://aquaprosmart.com/userfiles/files/30085100929.pdfIn PDF document text
    • https://dampinggame.com/calisma2/files/uploads/giwazitawatatokesuw.pdfIn PDF document text
    • http://ux02.wadhost.com/js/ckfinder/userfiles/files/dukumikujozekowuk.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/zamodowi.pdfIn PDF document text
    • https://latgalesamatnieki.lv/files/file/92128412253.pdfIn PDF document text
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/xagamokidemutoganaforigu.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/gubej.pdfIn PDF document text
    • http://evopizza.lt/ckfinder/userfiles/files/94037018511.pdfIn PDF document text
    • https://noursportevents.com/wheelmarine/userfiles/file/jazuramejakopefos.pdfIn PDF document text
    • http://paradisetourkorea.com/FileData/ckfinder/files/20210911_89C4BC287843BEEB.pdfIn PDF document text
    • http://nhac.ditimchanly.org/Images_upload/files/zumovatakizemisojobasejag.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147a250948f7---73206654144.pdfIn PDF document text
    • http://smartvoicecom.com/userfiles/vedavebebu.pdfIn PDF document text
    • https://horgaszvelem.hu/ckfinder/userfiles/files/63688760323.pdfIn PDF document text
    • http://kahasat.cz/data/file/63802442354.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614024209874f---99388484664.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/buzukutopuxavonupeb.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613f51e69f586---fizubus.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/xubeji.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/kilvi0i189ea2oe9ho2se2tmvm/84492538405.pdfIn PDF document text
    • https://jss-moms.si/upload/File/21785490105.pdfIn PDF document text
    • http://haozuowenwang.com/imagefiles/file/wudanilegebezalan.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_off0000c03e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC03E 19832 bytes
SHA-256: 8f7fc1f2f1df9d680776af0ae6a3ef1951d901a783ba2b6e2c2b21f069e665f3
font_01_sfnt_off0000f429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF429 10660 bytes
SHA-256: 74e57bd9daa5ff9df25355ba092e30fcf901b77a6b11d7b9adddc35092faa68b
font_02_sfnt_off00010c98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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