Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a65aa2e8fe66d4f…

MALICIOUS

PDF

90.1 KB Created: 2021-07-03 13:51:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fa83b634381da1805a52e521980f3693 SHA-1: bfe08330bd0b8a23eb16815a76491fd3652d4300 SHA-256: 6a65aa2e8fe66d4f66e21d68e4c5decd03d99d8a9266dee33d5b25dab64dd79e
96 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious. The presence of multiple distinct hosts and the use of UTM parameters suggest an attempt to manipulate search engine results or distribute malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • 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://tulsamemorialclassof71.com/clients/84987/File/22309455479.pdf In PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/a50fe1c699895f622591e78185aff99d/82457428357.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/63057547114.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa412a6d36---6466096334.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/cac8da8f888923e8c10588fe098976ed/nudeju.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/cc9f31ce1a1ba554306a3358da9ac654/sukufibadixufifewegoremi.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/d7c4fa323bf72f38741d65c1edea349d/wibor.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/87b4539f044eb7cc0340dd4775744091/71510800698.pdfIn PDF document text
    • http://cathyknightwaite.com/ckfinder/userfiles/files/98162320421.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/jspkm3k641t4hgc8igdq0c2715/48189054440.pdfIn PDF document text
    • http://marketherballize.com/ckfinder/userfiles/files/16840801272.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/zukiboxofobesejatiwof.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/b32c7415401be0eef576710ecd1b906a/sezizemivaj.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a36ccb744---96275613641.pdfIn PDF document text
    • http://thegioidahoacuong.com/uploads/image/files/47249296981.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/81f970727928a2372fd23769ec2b0029/99928059196.pdfIn PDF document text
    • http://nguyenquangcomputer.com/upload/ck/files/vazewuti.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609834e77d811---gavulotewa.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/66740555984.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/mikisedolidutozexezozuwim.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d236154bbd---77326693403.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081b6c9ec828---30920555723.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/901eaa9bd9500303686949cdf3306f37/wokagaxorirefujilibem.pdfIn PDF document text
    • http://sun-green.nl/ckfinder/userfiles/files/24066131485.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=white+miniature+poodle+puppyPDF 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_off0000fa17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11229 17736 bytes
SHA-256: 920f6bff934a7d2096147e3777dd045f35b367aed7cc853c2d890c13c6da9d63
font_02_sfnt_off000140f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x140F5 10696 bytes
SHA-256: 4f6a15ff4db31bf8631665461cf877bb7ce4e34e67aa0c2511a25cdde1d3e1c9