Malicious PDF — malware analysis report

Static analysis result for SHA-256 459221adf3df6a37…

MALICIOUS

PDF

77.4 KB Created: 2021-09-14 07:52:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 91c584488d98ae7b9b74d9207fcd700e SHA-1: 381d6a8d195d3661cba822f94a254b6f94fb0c5e SHA-256: 459221adf3df6a371480dbdacd631b438f677ec921056c4b8c72084579f54e9c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to websites hosted on disposable domains or compromised CMS platforms, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://buyyoutubelikes.com/ci/userfiles/files/44713586857.pdf In PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/22408689593.pdfIn PDF document text
    • http://rc-mst.com/mst/_upload/files/wukiroxawugu.pdfIn PDF document text
    • https://spirit-legend-enterprises.com/webroot/editor-uploads/files/23150345810.pdfIn PDF document text
    • http://ayrh.internet-match.com/upload/files/80434378523.pdfIn PDF document text
    • http://videofilm-tv.ru/content/File/18191517667.pdfIn PDF document text
    • http://abwpetersburg.com/uploads/files/24050056862.pdfIn PDF document text
    • http://hmondo.com/userData/board/file/74856028292.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/viribe.pdfIn PDF document text
    • https://mahanakhon.pacedev.com/ckupload/files/34469921.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/c9a9decc21e23afcdb4ca6dee8df78ea/xiteneximaxesawidowatibaz.pdfIn PDF document text
    • https://motecx.com/images/file/vuwifesasoned.pdfIn PDF document text
    • https://sogelec-eng.com/files/ckfinder/files/32314580092.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130ee032ac0c---88466046674.pdfIn PDF document text
    • http://www.gleason.com.au/application/third_party/ckfinder/userfiles/files/rotulukor.pdfIn PDF document text
    • http://automozg.by/upload/editor/files/76472814061.pdfIn PDF document text
    • http://kepco-group.com/uploaded_files/userfiles/files/zanorajudotumasez.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/goxikenem.pdfIn PDF document text
    • https://brs.jo/userfiles/files/14479285451.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/27571676965.pdfIn PDF document text
    • https://smilaxlabs.com/userfiles/files/26525049450.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/nuniz.pdfIn PDF document text
    • https://hssanesteban.cl/files/mejebagijutofirezavididel.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/qggivvimgi1qsogda7k62u8r74/50081959979.pdfIn PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-9-5/20210905183116559042.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=rizal+zip+codePDF 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_off0000cac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAC9 17740 bytes
SHA-256: 34205f3d459a086502b3bb38a34e819eecbc860cc607788218a1eb09ee8a91c6
font_01_sfnt_off0000f95a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF95A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11171 10144 bytes
SHA-256: c543e16a74fa58ff2bcfacf0ead036bd73927dece1efec5e603909cb96cccd10