Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e79a5f7696448d7…

MALICIOUS

PDF

87.0 KB Created: 2021-07-06 13:05:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 53a19e0fb2961d0637309a15af0899fb SHA-1: 3f9d52ea053dd5734c1e954bae807d29ec026579 SHA-256: 2e79a5f7696448d762cd8c43d514b3c24966f42fd9ff058f3301df14d8e5eba2
96 Risk Score

Malware Insights

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

This PDF file was identified as malicious by an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and other disposable hosting sites. The primary purpose appears to be SEO manipulation or redirecting users to potentially malicious content hosted on these compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://bilmatbasim.com/userfiles/file/9558346104.pdf
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/735a65e00927e4b881bb4036e838a3ed/3373875394.pdf
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/6ee6dc3b9128a61c1ee510f75fd3947d/86619999459.pdf
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/5019bee32cfaafd57dd0b19e727eb734/17962586417.pdf
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/477b7b1bccfe1f5baebafada68405ad3/buvixuxikodorade.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607128c4a8fa2---48218030702.pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608a2f390a6e5---jisigufaranujuz.pdf
    • http://creatinglifeoptions.com/userfiles/files/98688425806.pdf
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/07d4eb84d114101ceab3c2edaa43bced/55026153053.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/sagake.pdf
    • https://bancodevida.com/bancodevida/admin/images/image/file/73209390763.pdf
    • https://nikosdimos.gr/userfiles/file/54408269016.pdf
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/hp4pgd99f2250sbfrbvfdv9ic0/53746414294.pdf
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/upj1cb6mqar7a1lvbh56p5uvkl/11667474133.pdf
    • https://asthasupermarket.com/userfiles/file/95473695248.pdf
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/s9fcsfeji9gkc9sbme7u0vheu8/vugovubisazabijorosuwa.pdf
    • http://df-foundry.net/d/files/10072575100.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c3a93cc377d---99871977881.pdf
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a489ab5e0fd---lifebon.pdf
    • http://coopmong.com/ckupload/files/nelupijakeseraxujufarina.pdf
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091d0f64812a---devapisetudaxutiba.pdf
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086bd2ec04df---rumemezepar.pdf
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3cbf59980---42128121789.pdf
    • http://artecgroupservices.com/imagenes/file/jetuve.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=monopoly+junior+cars+3+instructions+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee89.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE89 16792 bytes
font_01_sfnt_off000106a0.bin
f06ea5072920df9315e859ea0eee2b33f4064f62e34f97603d6f544e82db660a
pdf-font-stream PDF embedded font (sfnt) at offset 0x106A0 10988 bytes
font_02_sfnt_off00012048.bin
18865c794e119584874d93313c99d5e3095afdcaad02fbb3ef3b72505e0eedf4
pdf-font-stream PDF embedded font (sfnt) at offset 0x12048 17824 bytes