Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1cee9f1771ff04e…

MALICIOUS

PDF

88.9 KB Created: 2021-07-05 16:11:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0e215b36bb70076978bde834fb079931 SHA-1: 465fe3df0f31f3a9390a2a01295578ecf3289b74 SHA-256: c1cee9f1771ff04ec7359b0dc0fa11fa81111e348c83deaab9d524c6ee29f88a
96 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting. The ML classifier strongly indicates maliciousness, and the structure suggests a link farm designed to redirect users to potentially harmful content. No scripts were extracted, but the primary attack pattern involves luring users via malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 https://irlanc.ru/uplcv?utm_term=march+book+one+john+lewis+pdf
    • https://ruiguoex.com/upfile/files/2021/06/06/pimadenamizotomovim.pdf
    • https://nutricount.cz/UserFiles/File/josabuzeririmujiga.pdf
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/8aibaceuten977ibue2khj36nf/58589434028.pdf
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/50942244356dfef36ed739890dd42730/dowulive.pdf
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/99435aefcc3c912481fb1107a0f58161/82101824422.pdf
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/lnn7t65m4s6s4fhe3839uacmml/zomajutikanomuzutufovobu.pdf
    • http://alliusie.com/userfiles/file/sebiketasodazesugival.pdf
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e0c41ddbf0---90858129195.pdf
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/b30a1bba3e2abcc2be79883a348f1c28/fejoxagujo.pdf
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/pikibilaramexolakukeka.pdf
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/tm6uvnqjujsod5u6kmvau6ap0r/46970314979.pdf
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/73oce6vuqgv83as3capacvhe95/futabaxosuwer.pdf
    • http://topoint.cc/userfiles/fckFile/20210621064555.pdf
    • http://beateromer.com/bilder/file/10244719363.pdf
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d32a5b328c9---bidasojegemevusebulibagu.pdf
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/e798225f385f3ab1648843b47268d819/28644563575.pdf
    • https://altonika.pro/files/fck/file/3471927085.pdf
    • http://jjinline.org/file_upload/file/wukup.pdf
    • http://mhinflatable.com/upload/file/sekowabikijup.pdf
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a31d86ee903---4997150715.pdf
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160983b75cbda4---1915410793.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/f151bi9pvvr5mn5oaodosrbg93/38398065775.pdf
    • http://carszana.com/image/upload/File/xepelel.pdf
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/892c9v9csra2tatsg4t9sqq2ko/xuvubekonumurunegadosig.pdf
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/c4ce9e470a8b0dfc02113fece8184af9/gotojakawilabigezon.pdf
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/7g2qsscvicu9im1k3n93l2gdbi/manenemijidixavefiwune.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_off0000f3eb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EB 16792 bytes
font_01_sfnt_off00010bfd.bin
e0cc2f383a74d1e2945eedd9062adb7d1f2ef797744de0084a3490a7884d93be
pdf-font-stream PDF embedded font (sfnt) at offset 0x10BFD 17992 bytes
font_02_sfnt_off00013b34.bin
482af6c8540a3dedb923d835fac0ebf147a123725d00f4ed6c45bae98bdef35e
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B34 11060 bytes