Malicious PDF — malware analysis report

Static analysis result for SHA-256 0877f8e25eaa4a6e…

MALICIOUS

PDF

83.0 KB Created: 2021-07-08 02:59:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e9cda8f66d333b326757bd8c1a62cc58 SHA-1: 95239bb38f0f34c1337bcce7031edc0f304735a9 SHA-256: 0877f8e25eaa4a6e3105eeb6fe03cc25505b5bf2a866a21d5c08bfc7093f003f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various websites, many of which appear to be compromised WordPress installations used for hosting malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to be a link farm, likely to distribute phishing content or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 https://nomylo.ru/uplcv?utm_term=how+to+clear+chat+messages+in+instagram PDF link annotation
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087b3af1450b---mabexu.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a71846fe7---70191926010.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/rbomegu5q9mktn3fatu8e5lhte/vatewuledikanikugusinig.pdfIn PDF document text
    • http://ridendo.cz/files/file/57852660885.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/lakol.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/79561860351.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/luzedenepumiwuv.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/sezifugivusaw.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/92408198589.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/acd025084e19c6fe4edb22e20e4b1caf/vabuwil.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/jesibi.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/32495075497.pdfIn PDF document text
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c50edab0c53---33025272394.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/s64f4vqkst885m70tjp49ljrr3/wuzanuguri.pdfIn PDF document text
    • https://amadesafar.ir/basefile/amadesafarir/files/nitobepa.pdfIn PDF document text
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/kvor8jdistg0jp788iihihoum3/42125434691.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160832015b94f4---pusakipivojowokivog.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/zavejusomub.pdfIn PDF document text
    • http://bmcnx.com/userfiles/file/pepameb.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/626cadfde38ace9e9fad12d327fc25e4/donawij.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/eb68eaf83ddb9efdbb5c9e0be6b6741b/55361396260.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_off0000e273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE273 10752 bytes
SHA-256: c08ecea550eac8cc10ec671247882600193d9655a377fb07dc764c22cdb56b3f
font_01_sfnt_off0000fb06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB06 16856 bytes
SHA-256: 9478b250f436b80aba0d73ea4141cf725d6dbe6aac736e2c8cae624122bf0e42
font_02_sfnt_off000126d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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