Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dbd28a53186670d…

MALICIOUS

PDF

81.9 KB Created: 2021-09-14 02:19:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ddbd049543c7175b97f470515bde7437 SHA-1: f6825fc5f9b91a8ff9dd68215d5be987bd91957c SHA-256: 6dbd28a53186670d3b775cc51ccfb356752073453cb3c6a39e2d1ec23567d50b
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple disposable hosting sites, a common tactic for distributing malicious files. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a small PDF acting as a link farm on disposable hosting, and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' suggests links to compromised CMS upload storage. While no scripts were directly extracted, the ML classifier strongly flagged this PDF as malicious, suggesting it likely exploits PDF vulnerabilities or uses embedded JavaScript to achieve its malicious goals.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://partnerplus30.ru/images/fornews/files/folebidiwiditabujijo.pdf In PDF document text
    • https://viadagio.be/userfiles/file/39904249574.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132ce869afe9---66222716720.pdfIn PDF document text
    • https://www.ccs-corporation.com/ckfinder/userfiles/files/82687285878.pdfIn PDF document text
    • https://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/22546370719.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1613417948071c---47302209917.pdfIn PDF document text
    • http://food-cloud.com/home/food-cloud/www/site/site/data/files/sopijifojadot.pdfIn PDF document text
    • http://dynamicyunnan.com/ckfinder/userfiles/files/45469266607.pdfIn PDF document text
    • http://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/57721907526.pdfIn PDF document text
    • https://www.restaurant-latableedevercel.com/ckfinder/userfiles/files/61134373324.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/95588289111.pdfIn PDF document text
    • https://universitecentrale.net/uploads/FCK_files/file/67123189295.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/wezunarevolasokafipaz.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/60332289021.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/4045040e3e38599480aaca73cec794f9/jogutotavazur.pdfIn PDF document text
    • http://envisystem.com/upload/userfile/files/59873972473.pdfIn PDF document text
    • https://ontogepszerviz.hu/editor_up/63050533414.pdfIn PDF document text
    • https://www.wemservice.com/ckfinder/userfiles/files/wixemepotesasibunep.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/3cb555af906aca3b44d990486b0f401c/82737554224.pdfIn PDF document text
    • https://penzion-palice.cz/content/pibabivulinagovilixisudew.pdfIn PDF document text
    • http://hanmih.com/userfiles/file/20210908052342.pdfIn PDF document text
    • https://www.mnogotrop.com/ckfinder/userfiles/files/xufafoduvasuzufuwikelipok.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/debobar.pdfIn PDF document text
    • https://termokingbt.com/ckfinder/userfiles/files/96414580298.pdfIn PDF document text
    • https://brincandoeaprendendo.com/fotosempresa/files/govivuxumiziropona.pdfIn PDF document text
    • https://kirmatas.com/userfiles/file/29637397303.pdfIn PDF document text
    • http://mariekevanvlierden.nl/survey/userfiles/files/memodam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=chrome+setup+windows+10PDF 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_off0000dc1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f433.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF433 10840 bytes
SHA-256: cd1d48f852197e5758a9c772f906fec34c773094bc2c3929defe8425126b5ab2
font_02_sfnt_off00010d24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D24 17524 bytes
SHA-256: 3f90c3a192a68ce9fab1339d54c721cb9503b59b15d015d49901192f7ce549e2

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