Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d643a992518168a…

MALICIOUS

PDF

102.5 KB Created: 2021-07-07 22:16:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 30a80eab94df622b8073562aec506e4a SHA-1: 79c790e5d320c12b72c053db619fac27d0cdbd4e SHA-256: 6d643a992518168ac04f076edd8ee728201c324392b9b0c9b15d124cfced1bb3
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to websites hosted on compromised CMS platforms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure as a link farm, with many distinct hosts and disposable hosting, further supports its use in malicious campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

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://www.deopendeur.org/imgUser/file/nobedimese.pdf In PDF document text
    • http://altelaw.com/uploads/image/file/kokimopofofosiwiras.pdfIn PDF document text
    • http://salt17.com/userfiles/files/bidazewepuj.pdfIn PDF document text
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/851894482b8d9abf33fece03a255422c/niwozifelereweb.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160c745d7b4c88---27496622243.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c261b32ff3a---rotisiwexolat.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/5617429105.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/4563d539a0d0a1bf2a72240f008a8012/49505906649.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16096ad4242a77---tosilumegapokuz.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/vodisakafemejetaxawu.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/27b861656baa2ccafe04d8cea66e4f9c/77972142113.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/e3a493a170c5d17d206ee5ef338b71ee/juvaxigekixilaxusovidate.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/99405511200.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/guxoragozasudalerunepujaz.pdfIn PDF document text
    • http://irishvaughans.com/clients/7/7c/7cfe0b8ff6d5e3136a6575a9b258a09c/File/738049314.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/revum.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/47309866386.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1608421ba86012---34046303636.pdfIn PDF document text
    • http://trhs64.com/clients/c/cf/cfad56e582d93fa9eda51f2516e23bdb/File/nixenudedivitesidas.pdfIn PDF document text
    • http://yuha.be/_files/file/teduxedonalubumudebubeb.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/f89550fb3a851f6a972fd7a4216bc6c3/wojigewarolebifofofeguzab.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/c43pkaksn42butn87bujmd6phf/xobawusekodo.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160807ef7a26cc---jirovovexivitibotixeba.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/sejavataset.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=student+of+the+year+2+fullPDF 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_off00012d25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D25 17972 bytes
SHA-256: 7419a7a1beafab41460525d2d2acf4527e88de25a89e39a1fd3e8e317782e981
font_01_sfnt_off00015c91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000174a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x174A8 10600 bytes
SHA-256: 8fd5d4b8c7525ae65952fdb592be210e5d2f9bee34792f9fee07b7c301bb4404