Malicious PDF — malware analysis report

Static analysis result for SHA-256 d41b76cc15c808b4…

MALICIOUS

PDF

89.8 KB Created: 2021-09-05 00:34:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 42e5171befc119d58d3ec918e84ee17f SHA-1: 89b6fa966178fa97d6e46c5af82e0078021772e0 SHA-256: d41b76cc15c808b469cc4b7147b7a248adf99fa688eebd098ca2cb1a8d91a611
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to websites hosted on compromised CMS platforms or disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the structure and URL patterns are consistent with a malicious PDF designed to lure users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://scapetime.net/images/website/user/files/35756329445.pdf In PDF document text
    • http://fandimnarodaku.cz/upload/file/gepasagabebufo.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/19776411033.pdfIn PDF document text
    • https://confidence-ist.mktechsol.com/ckfinder/userfiles/files/xugoweg.pdfIn PDF document text
    • http://chulatutoracademy.com/chulatutor/ckfinder/userfiles/files/liwawalexoweragokuvun.pdfIn PDF document text
    • http://blueview.nl/app/webroot/files/userfiles/files/2348461077.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/bukuva.pdfIn PDF document text
    • https://art-gallery.mn/uploads/files/fafif.pdfIn PDF document text
    • http://gentlemensquartersbarbershop.com/wp-content/plugins/super-forms/uploads/php/files/dedb0d96bdbee3222306e470ef328eb6/kuxanedenizuziz.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/cbh7vpgk1bkb6c744tfmv1f3e0/34508066301.pdfIn PDF document text
    • http://xn--clinicaquirogavilario-vbc.com/wp-content/plugins/super-forms/uploads/php/files/o5n2q6ng8nbkcli7b5utk46ol7/47341291550.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b760804f6e5---15870008692.pdfIn PDF document text
    • http://grafiport.com/userfiles/file/belux.pdfIn PDF document text
    • http://findplusltd.com/file/saveba.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/66173791262.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d669e35dea---78698033025.pdfIn PDF document text
    • http://avanti.pl/userfiles/file/20408795435.pdfIn PDF document text
    • http://berkeleyhigh64.com/clients/9/99/99a482d4bd0dc5522cc24ea7f8204a07/File/2281135113.pdfIn PDF document text
    • https://nexapos.com/upload/files/fapomorifoja.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/scd43g8ippvpasko04jj13fdqk/19658318162.pdfIn PDF document text
    • https://fminterativa.net/cms/plugins/ckfinder/userfiles/files/kejikoguzi.pdfIn PDF document text
    • http://myafmc.com/clients/a/a5/a51d49d85de18111a3d718c63a5e5081/File/7840955111.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/6476424988.pdfIn PDF document text
    • http://ubytovani-budejovice.cz/picture/vtextu/file/40541250078.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a794cfa07---vewupefanazuzebujodutiwuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=tetanus+treatment+pdfPDF 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_off0000fca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA4 10464 bytes
SHA-256: 0ff7bad8b8df7f16dd824f1eee4cef7a1f604e5ab2cad29d0e2bbf0eda17fad8
font_01_sfnt_off00011460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11460 17404 bytes
SHA-256: 44fd08b84fcab511450aef43f6028c4a9f60ac6347ec5f7d0542ba451fc95b3d
font_02_sfnt_off00014160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14160 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1