Malicious PDF — malware analysis report

Static analysis result for SHA-256 79eecbcc5ca8ad1b…

MALICIOUS

PDF

72.4 KB Created: 2021-09-06 05:06:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 230d1ca1f113663e900c1b79ed23fe95 SHA-1: 48b817274858dea2b88c07c47b5fbeabc5677c3a SHA-256: 79eecbcc5ca8ad1b1ab4edfdb007c6815907099e9091346e5d6d4bdf5ded4370
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains numerous embedded URLs, many pointing to potentially compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://shoreluxurylimos.com/userfiles/files/65071123051.pdf In PDF document text
    • https://directorvincentchow.com/fck_filemanager_upload/file/rezakapitogubekofopukex.pdfIn PDF document text
    • https://trouver-une-ssii.com/img/pics/files/wasigonoru.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/22589291914.pdfIn PDF document text
    • http://hoangminhceramics.com/app/webroot/uploads/files/14932922272.pdfIn PDF document text
    • http://art-ball.net/files/file/54608797908.pdfIn PDF document text
    • http://quincy.pl/ckfinder/userfiles/files/zukejed.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/1qk8rb98tgu2udpbqr4un1e7q2/bepapusumabuxi.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16072aaa1d3471---vubutiluxar.pdfIn PDF document text
    • http://leaguengn.com/userfiles/file///wulugakerewa.pdfIn PDF document text
    • http://flirtproducties.nl/ckfinder/userfiles/files/mareneluxumaravuz.pdfIn PDF document text
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdaa534f773---zijaketijinefuz.pdfIn PDF document text
    • http://rhodeislandalpha.com/clients/56223/File/gojabod.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/paduniza.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/67469478902.pdfIn PDF document text
    • https://smg.bid/ckfinder_userfiles/files/bijunoxokolefepabetife.pdfIn PDF document text
    • https://www.mds-horizons.com/upload/files/pemuxokov.pdfIn PDF document text
    • https://www.notusweb.com.br/ckeditor/ckfinder/userfiles/files/wikowunozipaxulogupap.pdfIn PDF document text
    • http://hyundaidongdo3s.com/images/files/3922811214.pdfIn PDF document text
    • http://mirai-kankyo.com/userfiles/files/81183067429.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/7012de17d498cc993d5d57bbc1f259ef/zevetip.pdfIn PDF document text
    • http://chiangmaicharmingtravel.com/ckfinder/userfiles/files/69535879421.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=images+to+pdf+mac+osPDF 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_off0000bb3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD351 10572 bytes
SHA-256: 75475a83f03451995a28bd2001a8fa8ba3307ab97ce286e42af2d953613840d9
font_02_sfnt_off0000eb4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4B 15868 bytes
SHA-256: 8f3d0a85becbbb9b6c297b7e8248095404b1fe9782397c09ff5283cac1fb44c1