Malicious PDF — malware analysis report

Static analysis result for SHA-256 e59e79d850d3e71a…

MALICIOUS

PDF

72.3 KB Created: 2021-09-23 02:09:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0573aac06bf02e63bf580a0b1af9ab8a SHA-1: b79cda02c012537e16e86d9feddb0ce30712add9 SHA-256: e59e79d850d3e71a72088edb8071968cfbd6b4376d313a54d37450412777d081
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for malicious PDFs. It also contains numerous external URIs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to facilitate phishing or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • 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://krisoc.ru/uplcv?utm_term=android+get+application+version PDF link annotation
    • http://hoangminhsaigon.vn/@dmin/js/ckfinder/userfiles/files/xulimipaxasajeb.pdfIn PDF document text
    • http://portaldo.eu/contenuti/upload/file/97918860190.pdfIn PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/34bb6451f1da39d93b20de95d5c3322e/nuvamejipaf.pdfIn PDF document text
    • http://avanti.pl/userfiles/file/54777974704.pdfIn PDF document text
    • https://vkgnassociates.com/dayafter/uploadimages/newsimages/file/57679233400.pdfIn PDF document text
    • http://antasboru.com/guvennet/resimlerfiles/36304019876.pdfIn PDF document text
    • http://perfect-gallery.com/userfiles/file/35963927878.pdfIn PDF document text
    • https://aluminiosarla.com/userfiles_arla/files/pekisen.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613065b31bb19---vuligenobafubonubom.pdfIn PDF document text
    • http://tw-jia.com/uploads/files/202109050009161538.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613034648e720---vezozemovaviforir.pdfIn PDF document text
    • http://demo-jesma.shopcloud.es/ckfinder/userfiles/files/57629603825.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/52494132226.pdfIn PDF document text
    • http://supragyn.cz/userfiles/file/nudopipuzabexalav.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/tatujuxenunijanufise.pdfIn PDF document text
    • http://nuklearmedizin-amro.de/userfiles/file/783990271.pdfIn PDF document text
    • http://chernogolovka.inhome360.ru/admin/ckfinder/userfiles/files/tedilelulifizoma.pdfIn PDF document text
    • http://espressobuilders.com/app/webroot/files/userfiles/files/35100062290.pdfIn PDF document text
    • http://zjqzzx.com/uploadfile/file/2021091208173773499.pdfIn PDF document text
    • https://kakakmanis.com/contents/files/nigagodelajo.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614b210a1ac58---kinodozevexururajen.pdfIn PDF document text
    • https://northcoteplaza.com/userfiles/file/11651502173.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5dbc31f08---9237899426.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e14b3a64b---rafanitavelibaxe.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_off0000b980.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB980 15968 bytes
SHA-256: b0df14ff8dbf0f6b3409cd94457139978d2cf1edb4bae47b37a363e60290724a
font_01_sfnt_off0000e2ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BA 10736 bytes
SHA-256: 02c1a1c1f0e83eb433b6b0a7e1a2743be553e1ec5613072c6b15fb70bf1908a5
font_02_sfnt_off0000fb58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB58 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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