Malicious PDF — malware analysis report

Static analysis result for SHA-256 26e7d3e4b88d686a…

MALICIOUS

PDF

107.1 KB Created: 2021-07-26 00:16:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f9d4e62fdcb308ec7143cff64aeeae89 SHA-1: 50a8e75fdf13d56099bfa8b695f4bd7852f068e5 SHA-256: 26e7d3e4b88d686a11c56d69358a413ccf3d4dfb6f67e0508f552a5630b32cb7
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised WordPress sites. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate this is a link farm hosted on disposable or compromised infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites for phishing or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160ce43175a962---givuxugarilo.pdf In PDF document text
    • http://mulherinscampground.com/clients/879992/File/37927205091.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608390cbd71fc---gototopunuxujununofap.pdfIn PDF document text
    • http://www.fd.ntou.edu.tw/ckfinder/userfiles/files/31455625654.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8a9198b48---66161423828.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/zuwufakepowetalosaw.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/58635386433.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087dad453f2f---namiramisazoxirikurav.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210630_132516.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/67576951320.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2cc30d37d---98770694576.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608214ec42f88---zagovedasigumerobiripos.pdfIn PDF document text
    • http://soflocops.org/clients/83264/File/2876762967.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/68238613893.pdfIn PDF document text
    • https://designcoordinators.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083b1e1623ea---90593095549.pdfIn PDF document text
    • http://ligneus.hu/upload/file/nobuxokegoxedezabu.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/14290104641.pdfIn PDF document text
    • http://noithatachau.vn/webroot/img/files/kitajokojasojisobuveroxi.pdfIn PDF document text
    • http://xn--or3bi2da319p.com/upload/fckeditor/file/nolavuwolosazedikoluvisas.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a03f1fa3406---xeralepisojarozov.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/86dab732b5289fc7b3b9439d15f17a13/75346989401.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/6fc8200ad1d8ffa010b80aac355dd2ad/xudopoka.pdfIn PDF document text
    • http://drprdesaihospital.com/uploads/2664292356.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/28770893280.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=como+realizar+una+tesis+paso+a+paso+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_off00013b06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B06 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001531d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1531D 10852 bytes
SHA-256: 3f2a22d4ac27e6bbbcba0c7bf6f111acda3f318ced4495942eb8c16c4a59e80b
font_02_sfnt_off00016c2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C2A 19016 bytes
SHA-256: b64cd40a528fe4e9c58625a568140403da4641828fe0efcb306089f6a775aed8