Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb8a7453334f4e8f…

MALICIOUS

PDF

90.7 KB Created: 2021-07-25 22:14:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 99164643df6219be568aef5f7dd65bdf SHA-1: db7a669cba1bde59a56434dd75b9f9fe64261939 SHA-256: cb8a7453334f4e8f5706166f74b98091bc82ae28920c1dc7803722002140a010
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to disposable hosting or compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further payloads. The presence of JavaScript suggests an attempt to exploit PDF vulnerabilities or execute malicious code.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cosmopolitanhotel.eu/uploads/wysiwyg/files/39397801109.pdf In PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/82599cb6c6683bdb123826aeb1fd567b/742165733.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/57171499912.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/jewapatobemabepevofivof.pdfIn PDF document text
    • http://henskeschildersbedrijf.nl/upload/vevututusoxavotoboweripu.pdfIn PDF document text
    • http://fishtech.org/uploads/userfiles/file/file/95930204620.pdfIn PDF document text
    • https://alves.bg/ckfinder/userfiles/files/febizoxarogubuto.pdfIn PDF document text
    • http://studioaba.net/userfiles/files/zijodenux.pdfIn PDF document text
    • http://www.pes.edu.mn/ckfinder/userfiles/files/30728355832.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f6e91a6a66---1745803340.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/3126067307fc085718f9377164dd2240/wixebitama.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607aefef2a466---21050580423.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16084b8ca7ed85---kelivufaxuguzisudawega.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/ea558e36cabde2e6fcff33a34d2868f5/lejabekibukorad.pdfIn PDF document text
    • http://kurumakaitori-one.com/js/upload/files/bosugudodobuwamifuti.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c74f878d6b9---vapil.pdfIn PDF document text
    • http://steps4cancer.org/clients/a/a7/a78c374070a178914b502abaf3db82b8/File/1651123164.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e64e0776e---28371283963.pdfIn PDF document text
    • http://myucpb.net/userfiles/file/34160480504.pdfIn PDF document text
    • https://tmtteks.com/files/nusubupexenuvelosibu.pdfIn PDF document text
    • http://zpb-maciejewski.pl/upload/fck/file/48006325789.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/qhs6evgopa881mrej7j64963jj/melizilebo.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160e85c8450908---88681128201.pdfIn PDF document text
    • https://ghnservizi.com/file/89592820718.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081bf3287d76---badivasalagideminedufubit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=how+do+you+write+a+tenant+proof+of+residency+letterPDF 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_off0000ff58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF58 10904 bytes
SHA-256: 32c4f4e821a9855ef874154dc92a9862270fe7a1998035f2f57152394ad081bb
font_01_sfnt_off000118c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000130d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130D3 17040 bytes
SHA-256: b338b82349e8be366e7f8fc9a0a10fdc0b59887d4a627ab2c753714dc08d3036

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