Malicious PDF — malware analysis report

Static analysis result for SHA-256 6893cd26b323af4e…

MALICIOUS

PDF

86.5 KB Created: 2021-06-30 13:53:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4d7ab44b0ed3e84177cf9df17974491f SHA-1: fa281c391d03f0f8c5aaaf74e216dfda89b3b4ab SHA-256: 6893cd26b323af4ebd017cdf5b11b4984bc10d09082c8e10c38394095a20dee6
96 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to compromised WordPress upload storage and disposable hosting, indicating a link farm designed to redirect users. The ML classifier strongly flagged this PDF as malicious, supporting the assessment that it is used for malicious redirection or to host further malicious content. The presence of multiple external URIs and link farm heuristics suggests a pattern of malicious link distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

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://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/6aed0309afb27d278caaefea31a45f4e/71544880351.pdf
    • http://cementfeet.com/userfiles/file/6560220753.pdf
    • https://institut-arabe.org/ckfinder/userfiles/files/gevavereravusufid.pdf
    • https://fotobolfestmeny.hu/mvc/userfiles/file/ziretanibevev.pdf
    • https://nutrishop.in/ci/userfiles/files/87179974351.pdf
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2ecb89d44---kimibekusemedizazupa.pdf
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16082455a2e2b3---48977951797.pdf
    • http://wurbs-hanau.de/userfiles/file/molam.pdf
    • https://armagedonspedycja.pl/files/file/vokuvixubidubo.pdf
    • https://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/9e295f139e4cd9308464a12c35a21fc9/3475191970.pdf
    • https://dm288.rs/slicice/file/kopejum.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160d6055dbf46f---35011692069.pdf
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba5a6bb7dd8---tojopenalexali.pdf
    • http://thegreenlegacykeepers.com/clients/e/e8/e8dc17949b7ef813e9937e453902477f/File/63805151321.pdf
    • https://masterjobintl.com/ckfinder/userfiles/files/bofimekuxebapakobotudow.pdf
    • http://wienbildarchiv.com/upload_files/files/ligatulepomurekenisat.pdf
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d0db40ebba380828721e575e8dbaa371/3548293210.pdf
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/345bf4aeee284a18ced7b08afdeadae6/66181139864.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a016b18ef7---filibakug.pdf
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160b82b22b2120---sugobug.pdf
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160946c558511f---nokufatusadog.pdf
    • https://boumqueur-edition.com/upload/fckeditor/file/bipefavu.pdf
    • http://pcserviszlin.cz/ckfinder/userfiles/files/sewizujopelivapubamedof.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d22cb000be---11128677651.pdf
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/ce609e0a8275907681911952493af184/jafekovativov.pdf
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608ccfb18b28c---lakajejawefixip.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=dispensing+for+pharmaceutical+students+free+download
    • 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_off0000ee81.bin
587b4a2f39f9950f02ad31f77b697558720e7d5d820c0942447679782ae776de
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE81 16912 bytes
font_01_sfnt_off00011a3a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A3A 16792 bytes
font_02_sfnt_off00013251.bin
fd09b7c83bacab630ba6fc042a4305c3a55b74324ddfd7b84a1838b84a10989c
pdf-font-stream PDF embedded font (sfnt) at offset 0x13251 11252 bytes