Malicious PDF — malware analysis report

Static analysis result for SHA-256 fed515192f9233cd…

MALICIOUS

PDF

86.9 KB Created: 2021-09-12 00:48:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d6dc76fd226dec8fcfdfcad9331256fc SHA-1: 50bb0ee2a7e403b955522a5f2f6c6b7bfc148aff SHA-256: fed515192f9233cdf5a2a16b8ba0f546ac0f1789276d4250d463ab14086cdc52
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to potentially compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is structured as a link farm, likely to manipulate search engine results or direct users to malicious content. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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 https://oniceh.ru/uplcv?utm_term=a+children%27s+book+of+demons+pdf PDF link annotation
    • http://xn--dlek-5qa.com/admin/UserFiles/file/70642808547.pdfIn PDF document text
    • http://artecgroupservices.com/imagenes/file/gelarubenaxux.pdfIn PDF document text
    • http://www.dagmarsvendova.cz/admin/js/ckfinder/userfiles/files/21601053974.pdfIn PDF document text
    • http://ckrestaurantgroup.com/ckfinder/userfiles/files/9771212349.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/bojab.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161342f1d671d9---67259905604.pdfIn PDF document text
    • http://slsnn.ru/content/files/takovivukefenofesajesog.pdfIn PDF document text
    • https://detskeihriska.eu/ckfinder/userfiles/files/84122103885.pdfIn PDF document text
    • http://pzhjintai.com/upload/files/43965532824.pdfIn PDF document text
    • http://agilesolutions.in/uploads/zegesiratonutepunomeza.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613426384265b---56502572400.pdfIn PDF document text
    • http://hotelborgodeipoeti.com/userfiles/files/40524140399.pdfIn PDF document text
    • https://www.assofmt.org/ckfinder/userfiles/files/31511159077.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16132285e15f59---11406271501.pdfIn PDF document text
    • http://metallpress.info/files/jurulerogamojaku.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/faxevodolifamudagu.pdfIn PDF document text
    • http://www.ecrivains-consult.fr/easyonline/ckfinder/userfiles/files/jakuverubuvuveduzeke.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/paxebabovepekujatojofub.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/e714b3c2191bbdc73b693c25f738eace/wubenelovipebepuxugamol.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/fisem.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/ernsi0gd7t4p8mv7s7ulbsktka/99124728308.pdfIn PDF document text
    • http://deeringbayrealestate.com/userfiles/files/kuzajulasagovoxe.pdfIn PDF document text
    • http://macierz-grodziec.org/files/file/93741297378.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/76333516826.pdfIn PDF document text
    • 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_off0000ebe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE1 18912 bytes
SHA-256: e1874a1f0d261ef7828996696cc3f6eb8e1dd52b916a5420266e3c5ae18ba98e
font_01_sfnt_off00011ca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA5 10872 bytes
SHA-256: 9bf02ee73d90682867dfa2e51e77f579d6e698607108417d61a222b5dc3ab28f
font_02_sfnt_off00013559.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13559 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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