Malicious PDF — malware analysis report

Static analysis result for SHA-256 803f42e3ccfdb6b5…

MALICIOUS

PDF

70.5 KB Created: 2021-09-25 17:54:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5dc6d5195c46af8866b675de9c6df843 SHA-1: 627db71ce5c0544f0b0d68ec08948e9f0e76818b SHA-256: 803f42e3ccfdb6b52a4cf6ca3f9829f25f6e8ca779c53b9545799e06f3c915a5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple disposable hosting domains, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content, likely leveraging embedded JavaScript for obfuscation or redirection.

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 https://happy-playground.gr/uploads/_uploads/files/rifofutosuwowafox.pdf In PDF document text
    • http://td-mg.ru/uploads/files/97993810943.pdfIn PDF document text
    • http://suachuadienlanhhoaphat.com/hinhanh_fckeditor/file/gunejaboguta.pdfIn PDF document text
    • http://fatfailogistics.com/fckeditor/files/file/gituguwuxiruwo.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/06035f970553eb886e9e4b9761c4f7e2/sojadatudonapexekiw.pdfIn PDF document text
    • https://lekkermooi.nl/userfiles/file/46125928520.pdfIn PDF document text
    • https://ibeguiristain.com/userfiles/files/fijujigekuwipalesekaxixe.pdfIn PDF document text
    • http://carmakers.cz/userfiles/files/73867822859.pdfIn PDF document text
    • https://drlanda.hu/user/file/bofopaferawegubojarotoj.pdfIn PDF document text
    • https://aalatour.com/basefile/b2caalatourcom/files/wejutaxurezoxobozenisaje.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146f90750612---maxumirupukapas.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/suganiratunupemelaxez.pdfIn PDF document text
    • https://dsverano.com/UserFiles/File/35716742962.pdfIn PDF document text
    • http://www.trackls.com/application/ckeditor/ckfinder/userfiles/files/wadusudosaxinolasipelalin.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/bc384416e5b09193b257729d024a55d1/59276351751.pdfIn PDF document text
    • https://siltri.com/fck_upload/file/28570253282.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1614d06ce785b4---rarudejeguguva.pdfIn PDF document text
    • http://daiichihousing.net/uploads/news_file/10475431697.pdfIn PDF document text
    • https://crownprolaw.com/userfiles/Proj_Name/files/61303340455.pdfIn PDF document text
    • http://originalavto.ru/userfiles/file/palokobavezuberenisu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=fortnite+gift+card+codes+for+freePDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139adef4a6ce---figitutaregukipobe.pdfIn PDF document text
    • 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_off0000b00d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB00D 17368 bytes
SHA-256: 7df727cab2b6beeed2c924c4d858dbd887a1969a247c88d43c83ed743cf389e2
font_01_sfnt_off0000dc8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8F 10580 bytes
SHA-256: b89d0b8b4203dd57f0d80e5e25be14ff06ad71abc67ce81e50a9481487b512c0
font_02_sfnt_off0000f4a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1