Malicious PDF — malware analysis report

Static analysis result for SHA-256 9825a4b89328d717…

MALICIOUS

PDF

79.8 KB Created: 2021-09-06 01:49:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5224fc40ec33312d87550f926f4879c8 SHA-1: 9a3105441b3530031da122c8e73aac7b8a04387f SHA-256: 9825a4b89328d7171e90962e61e7662d4682033451b49c53fa63354b4f2adedc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://dezmaster.com/userfiles/file/gegobo.pdf In PDF document text
    • http://korean-school.hu/hangul/userfiles/file/roxujigola.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/4136c9c736b11f240867a220c40aa069/lusegusagokizes.pdfIn PDF document text
    • https://srp-galabau-rostock.de/wp-content/plugins/super-forms/uploads/php/files/56bdcvoe0bsco8pqskpha55uq0/sofota.pdfIn PDF document text
    • http://edu-tur.ru/userfiles/file/45954891573.pdfIn PDF document text
    • http://projectbudapest.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160a315a21b15d---40067719864.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/vumutijelisoxozobanerodo.pdfIn PDF document text
    • http://fuga-hotel.com/CKEdit/upload/files/2514712079.pdfIn PDF document text
    • http://swaptoys.org/ckeditor/uploads/files/videkinugakusomubepewugad.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d54014fb1b---gexakude.pdfIn PDF document text
    • http://thecoferfamily.com/clients/7/78/7892d776c92a08c80f86ebc6236678d2/File/fitinitat.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/b127e2b289a5a093885e03350c67204b/vebexapex.pdfIn PDF document text
    • http://wardwrightself.com/clients/863644/File/motogizo.pdfIn PDF document text
    • https://rumahbaruku.com/contents/files/58878520437.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/puwesakujarerapi.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/kisugabunanuvid.pdfIn PDF document text
    • http://hoaphathotel.com/luutru/files/totijegazawirawenid.pdfIn PDF document text
    • https://samsungklimamodelleri.com/upload/ckfinder/files/1707317194.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/gowovetedogatidexaza.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/narumasepugufugu.pdfIn PDF document text
    • http://rayhovietnam.vn/upload/files/35988518474.pdfIn PDF document text
    • https://everestart.com/images/stories/file/57182788718.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=grade+5+language+arts+worksheets+freePDF 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_off0000d1bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CF 17848 bytes
SHA-256: 3ed58d8b53f8252ebaf3c91615a95bffa8c1534db79e8b4a10a79bab86fed72a
font_02_sfnt_off000117d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117D4 10992 bytes
SHA-256: ee026777ceda9d51b25ae0e96e107e77f3e6293e990c13c9ecb321fc22b95354