Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8e2b04c58975ae2…

MALICIOUS

PDF

88.0 KB Created: 2021-06-26 07:21:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 29f80cf1b19334cf6a66ca201c9a1359 SHA-1: 1d9b312780ce2ac4e420fb1db4ee678f0dfb50c5 SHA-256: a8e2b04c58975ae278bc75c86ac308090363b995b8525d239f4517f1c13eff31
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised WordPress sites, identified as a link farm. The ML classifier strongly indicates maliciousness. While no scripts were extracted, the structure and URL patterns suggest an attempt to manipulate search engine results or redirect users to malicious content, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 5

  • 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://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdbe49f105a---puxazeb.pdf In PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/t3kvllr7vrpfr2p70ur56s1sj4/dobexuzipe.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd4bdabb4ba---22908799959.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba2246c0075---18544915196.pdfIn PDF document text
    • http://fullcolorspandoeken.nl/userfiles/file/98713713986.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/1da6679edbb4418bb178401bffda78b5/nipusulakularinukogut.pdfIn PDF document text
    • http://phatnang.com/media/ftp/file/gufusasore.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/72f536f8bb675da627d827a87789386f/bimakezud.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1606d534e4dfc9---68922675868.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/df5539b88d9e70cec301e4886d1718b0/zekepunutum.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/2225df4c0c914fb354b0a423a8117ac2/guforixi.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/69863800867.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcdd34e4765---mugexajagilidibiluse.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/72059739746.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/34390463884.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aa239e8353a---molonudokik.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/co8ea1td24urdaltk12s20v641/82662687874.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/meriwunivafubini.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/55385095731.pdfIn PDF document text
    • https://xn--80afc2apd5n.xn--j1amh/upload/files/23900739982.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a716094ac3---motux.pdfIn PDF document text
    • http://fbchitchcock.org/clients/8/8b/8bdff38a390027835eb24981312b950c/File/lobidej.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9f7a6e989---2482924495.pdfIn PDF document text
    • http://deccanquest.com/konadnew/userfiles/file/47759720917.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+find+mean+of+sampling+distribution+calculatorPDF link annotation
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/8c68598de0c494286a37555de363731c/96598026347.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_off0000ef73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF73 17852 bytes
SHA-256: 114870eacb823974225de73de4300db0764eb12b31e3d9fc3a33ed9afc45b0ae
font_01_sfnt_off00011e57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E57 11280 bytes
SHA-256: b7d1b4239d8ca71bedb7b475df26ad8e8ae729299bfe99afda7cdb535d4a5242
font_02_sfnt_off00013862.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13862 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1