Malicious PDF — malware analysis report

Static analysis result for SHA-256 1da25d5541e4513d…

MALICIOUS

PDF

89.3 KB Created: 2021-09-06 19:31:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9eaf73f56cf31c1ba3f46e3d9f5713e2 SHA-1: c7509c0ae4f297a8a76d91daa22670d57fe3ee7b SHA-256: 1da25d5541e4513d93f3360a1927fb67486a7ee7b7433b6f0512abbd903b86e2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, forming a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using such sites for malicious redirection. While no scripts were explicitly extracted, the nature of the embedded URLs and the detection as a trojan suggest it likely attempts to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

Heuristics 6

  • 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.
  • 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://clinicoral.com/img/userfiles/files/2499842238.pdf In PDF document text
    • http://bodegaadrover.com/userfiles//imagenes/ganuboge.pdfIn PDF document text
    • http://snypes.nl/img/customer//files/bolitarokijibesuremavi.pdfIn PDF document text
    • http://slsnn.ru/content/files/nibirori.pdfIn PDF document text
    • http://sentezetutmerkezi.com/upload/ckfinder/files/xowuluvad.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/61945972397.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608c05301cfc8---narigixirejake.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608cb014e020a---83856737660.pdfIn PDF document text
    • http://cristalensi.com/public/File/lerevilibelaminajapize.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/xinesufeleb.pdfIn PDF document text
    • http://contelex.it/userfiles/files/wawizumu.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609dad298c96b---gumagexiv.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/tuxejalopik.pdfIn PDF document text
    • http://globalfeedindustry.com/upload/files/95817751106.pdfIn PDF document text
    • https://vidaleve.net/ckfinder/userfiles/files/zokuvijisumas.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160961ef6df07c---4791967991.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/d32e7111f533e2687d275df19304c31e/veluwawonalisejoxeziwomak.pdfIn PDF document text
    • http://wo-kop.pl/userfiles/file/39110013648.pdfIn PDF document text
    • https://alirezamirmohammadi.com/images/upload/files/58757468881.pdfIn PDF document text
    • http://keifo.ru/ckfinder/userfiles/files/xazunu.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/bbgio50fmkb0r9fqlrj8npr1ef/kuzobamuweginulisiwebid.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/05653c64b019c4fb4c03f92e88172aa4/zimexuworumabawoguj.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d80b3d41955---logozatosefavifokefi.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/qkfut0tdqcfdq1u38q0ur1h72s/dopebabe.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/40eacdaa9800de46ee48b6461aeaebf7/17277441248.pdfIn PDF document text
    • https://daotaolaixesontay.com/uploads/file/63719897111.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=convert+pdf+handwriting+to+textPDF 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_off0000f760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF760 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F77 10848 bytes
SHA-256: 5c4c1b37be6d691e9e6dcc59dfa0830433db9fd577f9ed9a0fcebbd2f22586ea
font_02_sfnt_off00012858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12858 18080 bytes
SHA-256: dd01893d89318d134c0e5bf503ef4ce356ac28ee84b1c4c002faaa81ced3f502

Open this report in the interactive analyzer, or submit your own file for analysis.