Malicious PDF — malware analysis report

Static analysis result for SHA-256 c88b6d3d4f481f4d…

MALICIOUS

PDF

77.3 KB Created: 2021-09-07 20:05:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 3a3d597c3da49547649d9220574dcb36 SHA-1: 07d9610bef0827571b7b12c0d1501079cd5c7236 SHA-256: c88b6d3d4f481f4dc9cf2f6a516ec5ec235a24078d9fc6802bf8564b0d19b11f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://hkparkkonutlari.com/image/files/24214482210.pdf In PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/3c54f4ef5eaa419cc4cff6b7cfed435e/19187590667.pdfIn PDF document text
    • http://viviapalermo.com/userfiles/files/lizowupa.pdfIn PDF document text
    • http://tuanayapim.com/rsm/files/nojilugorubozimakara.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/1fa21aa6c8074a145f6b9121cf773fa5/kawafejefibimefazuwamomix.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1620765366.pdfIn PDF document text
    • https://iveducentar.com/uploads/assets/file/kiravodiredaxol.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/3f054a528550f4d5ae7640a325022f67/nagajegazezafem.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/9603509545.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/70289fcfce6e234cad34a57247ec24ff/79340048166.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/51814914734.pdfIn PDF document text
    • http://kvbm.org/pds/userfiles/files/6927882735.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/dabap.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/99254322024.pdfIn PDF document text
    • https://bloc-immo.com/images/39392861369.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ead00e9653---meduzupixozilogabiluwete.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/364a2795defe719c5227d3e908f75746/85931827867.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/sibatewilobazugoge.pdfIn PDF document text
    • http://ilovechardonnayhills.com/userimages/93717336655.pdfIn PDF document text
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607949a6d33cf---85351609486.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d419b49e4f---tirabapababupebajaruwob.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611308138ccbf---zuxabexu.pdfIn PDF document text
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/fcad1c36db0579adfcd5f2b8a3b75614/metupojexipefemuluxopufu.pdfIn PDF document text
    • http://ccshecea.org/upload/files/gusutar.pdfIn PDF document text
    • https://lotteppta.com/beta/assets/file/83042726408.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=imarflex+juice+extractor+manualPDF 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_off0000c9bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9BD 10612 bytes
SHA-256: c2f62613c59cd7f548897bf61d5538f3acef72da87effee26681125abaa51a45
font_01_sfnt_off0000e1e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E9 17596 bytes
SHA-256: 9cd7361cb27e2e0bd11d609db62449b14d2815b7e4ea48673c9ad3a761e1d497
font_02_sfnt_off00010fb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1