Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a4bd7e710942594…

MALICIOUS

PDF

86.1 KB Created: 2021-09-17 05:45:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4d91923507a81143376ea19985955165 SHA-1: 6248bcc5017f0639e2d20e75fbd85ad2b1ee03d2 SHA-256: 4a4bd7e710942594841fc10c6d09d18173f477d579e221607bc61078a61c4a09
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains a link farm with numerous URLs, many hosted on compromised CMS platforms, suggesting an attempt to redirect users to malicious sites. The presence of multiple external URIs and the overall structure indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 https://sunridgecorp.com/uploads/files/202109061544172792.pdf In PDF document text
    • http://onishi-kyosendo.jp/archive/66427843784.pdfIn PDF document text
    • http://on-video.com/movies/movie_data/file/nubozogibatefad.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/jojisow.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/8c0a56ec6b5a43f9715b50240e8efb8f/4003624681.pdfIn PDF document text
    • http://locthanhwindow.com/img_duhoc/files/60771717240.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb64719f49---47598948776.pdfIn PDF document text
    • https://bloomlight.pl/_bloom/file/norixire.pdfIn PDF document text
    • https://ensegun2.com/ckfinder/userfiles/files/13991946281.pdfIn PDF document text
    • http://jmk.kr/ckfinder/userfiles/files/simunilovorukume.pdfIn PDF document text
    • http://michalpavlicek.com/uploaded/file/pelebofidigavisotevego.pdfIn PDF document text
    • https://rlmahtani.com/userfiles/files/moduzelanapinuveji.pdfIn PDF document text
    • https://artenika.pl/fck/file/buwuzosos.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/68613016759.pdfIn PDF document text
    • http://tprcindia.com/ckeditor/ckfinder/userfiles/files/mezawamer.pdfIn PDF document text
    • http://clarklawtexas.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/45572640626.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/gulivofolibifogobamisud.pdfIn PDF document text
    • http://ros-audit.com/i/up/file/zekufojazebipagam.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/jq2spk6uv3off07ucmtfhdn48r/bosevakugub.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/72812800656.pdfIn PDF document text
    • http://gokea.org/upload/editor/files/vesezekuxote.pdfIn PDF document text
    • https://samsungklima.net/upload/ckfinder/files/56771253277.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/wunaginozunirow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+download+ringback+tones+on+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_off0000e8c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C4 18828 bytes
SHA-256: 066d4f23b1bc06de9bed40ae833804ec7256dc3d8c3a44f9c0495a0910122724
font_01_sfnt_off00011a02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A02 10856 bytes
SHA-256: 6fc31226541a4dc5e45781dc2e90d0c83b04329b47ceca068fb7644ed9e9ae20
font_02_sfnt_off00013306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13306 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1