Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dcf7d32dec6d79a…

MALICIOUS

PDF

88.1 KB Created: 2021-07-01 00:26:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 1d5408f97360d1fdf148dab8f23adcd3 SHA-1: 8adc40af2b96917326fd797615226a545ee4c0ce SHA-256: 7dcf7d32dec6d79a43b2baf7525dbfd6155eeb7fd22e28018038b0d08ece9eae
96 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to other PDF files hosted on various domains. Several heuristics indicate this is a link farm, with some links pointing to compromised CMS upload storage. The ML classifier also flagged this PDF as malicious. The primary purpose appears to be distributing malicious content or manipulating search engine results through a network of linked PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://alexlunacoach.com/img/editor/file/vulole.pdf In PDF document text
    • http://amirafouad.com/uploaded_files/file/jakiremumijat.pdfIn PDF document text
    • http://elskenecologie.nl/files/pogopimo.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/86064929306.pdfIn PDF document text
    • http://sazjah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7654313a23---25362133423.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/godixisiwulubejo.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a398930e767---wejubonujupulufusegisolew.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/09bfd5edba07b1bb2c562d41d424eef5/lovusidi.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/46298519027.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/n38b4uu7k1u67gpcsdmg5lckhg/vuxazudadekamol.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609854f26f2df---dopaxolofozerunores.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/9c8e6bc2a159b294cbededd8ddea363a/64024425246.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/33342366748.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/girovabekanubokoxoxomavof.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609edb1b4ea84---xokoduludedex.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/mipizogurekeriwa.pdfIn PDF document text
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/5f66c9704266ccd3ec104d41d82a285a/72567556153.pdfIn PDF document text
    • http://dichvugiayphep.biz/upload/ck/files/zuxarunoja.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac9a5bc38a---164100671.pdfIn PDF document text
    • http://raisemoneyonline.org/clients/6/69/691275cf9a36cab982b2498ebdc715be/File/punuzotomanidefatanaju.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608923a95df2c---74968709910.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/d2ac15970966c2717be1cec8875a2058/bazirof.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/64795636291.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d97d6ed3f52---tizaruje.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1607370e63f128---silevamuwopozevipaxases.pdfIn PDF document text
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/1ekmqlnna5mk0iodtj5ls4165a/71243878273.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=stocks+and+derivativesPDF 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_off0000f543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF543 17452 bytes
SHA-256: 203213c145beb6c297509a9bb9511212291cf619eec68cdf6cef922f9d231920
font_01_sfnt_off00012304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12304 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013b1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B1B 10548 bytes
SHA-256: b8ea763caf9a526fa6e25a12912dc7164b5f77db797c44c759541c99520d3a61

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