Malicious PDF — malware analysis report

Static analysis result for SHA-256 123ffe8363400904…

MALICIOUS

PDF

73.4 KB Created: 2021-09-08 02:28:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a523e06796a72c304c412eb02b88b4c6 SHA-1: 6f4d1bbef7162697f3af7b5d07c67da438df0a36 SHA-256: 123ffe83634009043bd804e237e2c2655b6b70d16c38b62465860771411b1918
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of external URIs and embedded links supports the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7099

Heuristics 5

  • 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
  • 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://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/94b7cac46c72c6f58c4a8454c375a1f7/vusafi.pdf In PDF document text
    • https://angkoronetour.com/userfiles/file/36938864674.pdfIn PDF document text
    • http://1qjd.com/upload/files/2021-08-06-22-22-57-UV7JJwrq.pdfIn PDF document text
    • http://satisfytech.com/ck/upload/files/lekurute.pdfIn PDF document text
    • https://rheinfurth.de/userfiles/file/33879088046.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/vejibededajivebov.pdfIn PDF document text
    • https://thingstodobahrain.net/ckfinder/userfiles/files/25685802093.pdfIn PDF document text
    • http://gingerbreadvillage.org/clients/e/e3/e396b250b60561adcb946853f9f62e29/File/35006313185.pdfIn PDF document text
    • http://daphongthuyhueminh.com/uploads/image/files/devebumuruvisoxu.pdfIn PDF document text
    • http://liffeyartefacts.com/fckimagefile/file/refezeravidilajubinu.pdfIn PDF document text
    • http://ags-sib.ru/ckfinder/userfiles/files/78487841624.pdfIn PDF document text
    • https://angkorphotographyguide.com/userfiles/file/97393180786.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc86656ca0---pubegen.pdfIn PDF document text
    • http://vuatoyen.com/uploads/userfiles/file/53392125201.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105184649836---jurive.pdfIn PDF document text
    • http://location-venise.com/italie_documents/files/61165081340.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/72747521663.pdfIn PDF document text
    • http://teaandtiara.ca/clients/c/cf/cffd5a667a547ddf6f7ed7e454f715b7/File/xadikewufedesuwixivutu.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/nupamuzupav.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ae8c2c4c88e---mulinijuxewulijawi.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c95e54a9802---25346309246.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/51442283042.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16099e5b15bfe4---puzofudaremi.pdfIn PDF document text
    • http://www.yankey.com.tw/demo/public/editor/ckfinder/upload/user_upload/files/45426885302.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/stmt6tip5rkt7aom8vhkcp0n65/xitever.pdfIn PDF document text
    • https://www.kasekimi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073a27cc5437---wirokumebaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=free+social+emotional+assessment+tools+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d62e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD62E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE45 10756 bytes
SHA-256: c9fa917c76b2cc31c20f37d385e8331fd8f734d9de0be030dfc411f95453336b