Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4c0cb47cb7bba10…

MALICIOUS

PDF

70.0 KB Created: 2021-09-26 05:58:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d3675307decc9e3cb231f0f450e3541f SHA-1: 51b9ebced38d4ea1d81afe90a22c50390f7e32c5 SHA-256: b4c0cb47cb7bba1086e7f4ab9c03ad4ebe216305738666f045c575c487830fcc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and a significant number of external links, many pointing to disposable hosting or compromised CMS uploads. The heuristics indicate a link farm designed to redirect users, likely to download malware. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • 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 http://standardamulet.com/files/files/57450676622.pdf In PDF document text
    • http://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/88321350062.pdfIn PDF document text
    • http://mehmetrasimmutlu.com/icerik/file/943458595.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/xezuvonitisusorit.pdfIn PDF document text
    • http://cloverdiamond.com/file/jewud.pdfIn PDF document text
    • https://tranthachcaodanang.com/uploads/image/files/24637893952.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/27752687145.pdfIn PDF document text
    • http://xn--9i1b14l32gg2dsybq3b.com/upload/fckeditor/file/1241834498.pdfIn PDF document text
    • https://www.vita-organic.eu/admin/ckfinder/userfiles/files/34478557545.pdfIn PDF document text
    • http://jonellchem.com/upload/files/63381965983.pdfIn PDF document text
    • http://futsalcb.cz/picture/vtextu/file/18886917533.pdfIn PDF document text
    • http://jiducn.com/userfiles/aa/file///vubisapedamida.pdfIn PDF document text
    • http://mclarenquartz.in/ci/userfiles/files/16977416768.pdfIn PDF document text
    • http://synowka.pl/galeria/file/54181784760.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/88712421086.pdfIn PDF document text
    • http://wxeina.com/userfiles/files/xunajoso.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/0oreg103o0i191vhbbhrnhfp46/29858592573.pdfIn PDF document text
    • http://dpnovelty.com/upload/files/89053923660.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/6861c24a07a721c3d4e205e85d162c3e/nibepusudebutuj.pdfIn PDF document text
    • http://maulich.vn/attachment/files/36208729592.pdfIn PDF document text
    • http://lecieldesandes.fr/ckfinder/userfiles/files/79167670564.pdfIn PDF document text
    • http://xn--80aafjbawrcdgsodbdciig4a5v.xn--p1ai/pict/file/senasov.pdfIn PDF document text
    • http://www.stallionreadymix.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161497efb0b88a---retaxatedar.pdfIn PDF document text
    • http://nanoscopy.ru/uploads/files/tovakexipapedovotamaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=download+game+ppsspp+gta+5PDF 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_off0000b010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB010 10764 bytes
SHA-256: de74b24b59eba48ac984f080e7deae3933969915d6872ce4048840593f410e2d
font_01_sfnt_off0000c8bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8BD 16552 bytes
SHA-256: 15597fb126e82aa88597f491164eb60ae48592536c0805c605fcf9878aaab139
font_02_sfnt_off0000f299.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF299 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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