Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e90deeabdf4e74b…

MALICIOUS

PDF

87.1 KB Created: 2021-09-18 15:05:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 20929aa560a7012921609c1bd426dd1e SHA-1: bf5f0f993e3dbcaf1dadc4cfb2402f7b750072dc SHA-256: 8e90deeabdf4e74b9bbad9facc179cd906a545b4b288ce1c4adc9ebc71917737
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm directing users to various websites, some of which are hosted on compromised CMS uploads or disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing lure, likely attempting to trick users into downloading further malware or providing sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • 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://xsteelstock.com/d/files/38943333980.pdf In PDF document text
    • https://reitinguok.lt/userfiles/file/80063213860.pdfIn PDF document text
    • http://boonfagrandhome.com/user_img/files/tokusamipupavilogosige.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e14fe77161---letagifefe.pdfIn PDF document text
    • https://prestinireedcorp.com/userfiles/files/datazexagojuzevasa.pdfIn PDF document text
    • https://i-intelli.com/ckfinder/userfiles/files/25626688681.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/16145d38772745---69847106481.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210903185531.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138c1f89ff41---15758469162.pdfIn PDF document text
    • http://heatexchangersolution.com/upload_fck/file/2021-9-7/20210907174927639252.pdfIn PDF document text
    • http://ohmamakitchen.com/uploads/files/12747390572.pdfIn PDF document text
    • http://baozhaopharm.com/upload/files/24896870085.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210915193419.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/84815175253abf71014bb362ed1cdba9/lotafiposesovomal.pdfIn PDF document text
    • http://marmaraisg.com/images_upload/files/7613885456.pdfIn PDF document text
    • http://kleinschadenexpert.com/userfiles/file/tutoregizilopapunevitew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=god+of+war+chains+of+olympus+free+download+for+androidPDF 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_off0000eae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F6 18792 bytes
SHA-256: 8ed6090c17dced632e6b795266cfe02a623ebfb07a7da74969a3e9b1cbbd62ed
font_02_sfnt_off000134a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134A1 11128 bytes
SHA-256: 873cca4a1b0d234994b898c1cd4080e4147eac14dc876b4051d11ee61d5b958c

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