Malicious PDF — malware analysis report

Static analysis result for SHA-256 524409ea135b6040…

MALICIOUS

PDF

80.6 KB Created: 2021-09-14 09:34:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a8625d5d6836f4eb0f314e1e90bf4aae SHA-1: dc90fb716962a624b3865ac1141701ae10366974 SHA-256: 524409ea135b6040d1d306a221f340340031c473f095f0ed70f755aa7417ef85
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS uploads or disposable hosting. These links appear to be part of a link farm designed to redirect users to download pages, as suggested by the 'utm_term' parameter in one of the URLs. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://crysiq.ru/uplcv?utm_term=proxynel+free+download+video+pc PDF link annotation
    • http://evola.it/userfiles/files/ratazumeligemu.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161335c93c623f---pixabotaderedunaruvofeji.pdfIn PDF document text
    • https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/dobezimuvosituxawol.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xeweku.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/gidevoj.pdfIn PDF document text
    • http://leylatoprak.com/userfiles/file/91413814530.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16137e4a794543---29668174239.pdfIn PDF document text
    • http://www.cda.org.hk/ckfinder/userfiles/files/sewurudej.pdfIn PDF document text
    • https://tndvn.com/js/ckfinder/userfiles/files/kixijexevejes.pdfIn PDF document text
    • http://network-italia.it/file/859190956.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/33564612655.pdfIn PDF document text
    • http://asacnfservices.com/ckfinder/userfiles/files/gukobevojalirojeverak.pdfIn PDF document text
    • http://mgrima.com/files/file/83922716080.pdfIn PDF document text
    • https://millersexpress.com/userfiles/file/87287491173.pdfIn PDF document text
    • https://eventaipei.com/upload/files/labezup.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138966645412---xubezobewaw.pdfIn PDF document text
    • https://enilubricant.hoakhanh.vn/uploads/image/files/wasuk.pdfIn PDF document text
    • https://jetaime-shop.dvsportbg.com/files/71129855083.pdfIn PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/94062558367.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a94c375239---vililufudaworokomemixo.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/161333b9fb57df---kuzalosoxafiwekerufa.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_off0000d5b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B0 10716 bytes
SHA-256: 169b781a8bcd01276746088ea4d831bc08718752a12372c4a2b9ebd64ecfcd45
font_01_sfnt_off0000ee73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE73 17844 bytes
SHA-256: 524efdacb78e0550ce91901a1aacdc60bf90953d7cbfda6e7187a71e342c2f82
font_02_sfnt_off00011c63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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