Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb0e79c5a37acc87…

MALICIOUS

PDF

81.3 KB Created: 2021-09-20 08:22:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e90576dc484e4077219b0f622a4effc0 SHA-1: 851ccf496a04d9622a2b68cab46fb66b79d10bb8 SHA-256: cb0e79c5a37acc875be01e8ebcf835b3758ad2e3b4dc159994ad521c1cff013a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users. Several heuristics indicate the presence of link farms and compromised CMS uploads, suggesting an attempt to disguise malicious links or host malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://trouver-une-ssii.com/img/pics/files/janikixijibaw.pdf In PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/92156352238.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/lvd7l1r63g2bbuh1fdqo7vbttv/57354209465.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/27655152302.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/86904514200.pdfIn PDF document text
    • https://transmilenio.net/datamont/userfiles/file/33529291220.pdfIn PDF document text
    • http://findmecakes.com/userfiles/files/dokawewuna.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/nakud.pdfIn PDF document text
    • http://samtekelektrik.com/files/32355879255.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/27624f4c45b6162f98eaf7c36680f740/buveronixakigibidab.pdfIn PDF document text
    • https://rumusjitu.com/contents/files/ponabajomebovokabemidokaz.pdfIn PDF document text
    • http://dlzhrjd.com/images/uploadfile/files/patiso.pdfIn PDF document text
    • http://nawaress.com/webroot/js/ckfinder/userfiles/files/8158501529.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141521433be0---lupexerevedosabo.pdfIn PDF document text
    • https://memo-log.com/userfiles/file/jerizamupuwumeletedivudom.pdfIn PDF document text
    • http://sportsbettingconsultants.net/cote_dor_import/admin/ckfinder/userfiles/files/86142104263.pdfIn PDF document text
    • https://kampusogrenciyurdu.com/file/lutifapodomesalodakevere.pdfIn PDF document text
    • http://vivaldiskibus.com/FileData/ckfinder/files/20210912_2E53E71FAC07106B.pdfIn PDF document text
    • https://rh4-h1tapi-turbo.com/contents/files/64548859982.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/37275000115.pdfIn PDF document text
    • http://red-persimmons.com/upfiles/editor/files/82183052429.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/20858788393.pdfIn PDF document text
    • https://vozilasavozacem.rs/files/gulonofonebawesoga.pdfIn PDF document text
    • https://reha.bg/content/upload/file/zokikuzox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=ninth+dr+whoPDF link annotation
    • https://mediacentre.heathrow.com/js/ckfinder/userfiles/files/nazageposofagekibeline.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_off0000dd39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD39 9900 bytes
SHA-256: eab9cfdd3eb9a71642fe64abb759ba5b1be9b174e54b0e8dd69e103585e0e6e5
font_01_sfnt_off0000f2f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B03 17524 bytes
SHA-256: 5bf6a7d6e4bd97498e60f6e0215d458ba0c385a60565b493c904801397f8d3fe

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