Malicious PDF — malware analysis report

Static analysis result for SHA-256 779e37f4afc74d47…

MALICIOUS

PDF

80.4 KB Created: 2021-08-18 22:09:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c707f7ea04aae9a5450d32739fe2d744 SHA-1: 9c611175b6f8bbf9cb260c85ccb5d974c47219ef SHA-256: 779e37f4afc74d47078375bd1f39a806b1522abb7f6fb161e90947c7b416e0a5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many embedded URLs pointing to compromised WordPress sites and disposable domains, suggesting a phishing or malware distribution scheme. The document body was unreadable, but the presence of numerous external links strongly supports the link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607cae6ddedfb---90751326027.pdf In PDF document text
    • http://happy-travel089.com/CKEdit/upload/files/patuvujegipadubij.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161148bd6289de---lujafude.pdfIn PDF document text
    • http://geteffective.biz/uploadfiles/file/rigesivivofeno.pdfIn PDF document text
    • http://spamsmsgiare.com/media/ftp/file/3133923879.pdfIn PDF document text
    • http://casinodanmarkjackpot.dk/userfiles/file/mavuxemiwoleraxefet.pdfIn PDF document text
    • https://toskov-yordanov.com/userfiles/file/16489037908.pdfIn PDF document text
    • http://www.drop-lok.com/wp-content/plugins/formcraft/file-upload/server/content/files/160843b2cea12c---84015260311.pdfIn PDF document text
    • http://yucehukuk.com/resimler/files/71837899110.pdfIn PDF document text
    • https://unibel.pl/pliki/upload/file/98253633330.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/nanugefip.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/oh5bboidinqi28d63muhit3hr6/55510423588.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/vewulorimomefirejelep.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160900a80d931c---32353103374.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/26f17a8c54bd929d1f2feafc36749cf7/rozes.pdfIn PDF document text
    • http://geobigoni.it/userfiles/files/83804704724.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/1608065b7e7dc5---dubagorowapafawinokavav.pdfIn PDF document text
    • http://accessprecision.com/userfiles/file/belumu.pdfIn PDF document text
    • http://tid.vn/upload/files/64336314198.pdfIn PDF document text
    • http://dlmberatung.ch/userfiles/files/vafadilagus.pdfIn PDF document text
    • http://bluecreator.biz/ckfinder/userfiles/files/lebalemetudi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=problemas+sistemas+de+ecuaciones+2+eso+resueltos+pdfPDF 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_off0000d120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD120 18192 bytes
SHA-256: f1fba25a653d544c69f72bf5b85c3d5eb093289800a8f5aa03d3e2a2f8a0d7a6
font_01_sfnt_off00010010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10010 11144 bytes
SHA-256: 76670779f74c615704ea2b4652262beeb6f32aca36d79c474979b9bec9a7d2dc
font_02_sfnt_off000119e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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