Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a5cd5da2122c704…

MALICIOUS

PDF

72.8 KB Created: 2021-09-04 15:02:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 3212cb6035d3127f51becc5b4a0d9c6e SHA-1: 29f084aa8832f3ab265913a0b8b31726d3ab56bf SHA-256: 5a5cd5da2122c704302315309ac332bb8bf05d5318c22f369908ba9791070931
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm for phishing or malware distribution. The ML classifier strongly indicated maliciousness. Although no scripts were extracted, the structure and URL patterns are consistent with a malicious PDF designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/oguberhhu12h61e1h5i0uh7e8v/wupikabobodevabow.pdf In PDF document text
    • http://zsmnowakowski.pl/userfiles/file/fifogitijuxakara.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/69fb7c1119890614020984616d9fb243/48863074347.pdfIn PDF document text
    • http://be1971.com/clients/a/a1/a19be2fc4cf8b198b52f296748481ce5/File/7437685979.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607588f03936b---fifebumivexadusivud.pdfIn PDF document text
    • http://zafirkort.com/uploads/files/woxitajunotedukigusafat.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210528_094633.pdfIn PDF document text
    • https://kaptenhoki.com/contents//files/nulavokinasogel.pdfIn PDF document text
    • http://agendaalzheimer.org/files/galeria/files/kopevifotilat.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/44655337054.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/qpju4gorsogh72f31of7skegq9/51908455121.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160abf6246e579---walugafuzobovisagol.pdfIn PDF document text
    • http://chandravanshi.com/userfiles/file/tevarusijululizomoru.pdfIn PDF document text
    • http://portalinmobiliario24.com/uploades/fckeditorfile/13890188354.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/885d8a9febbb7ea6c37d4c544100d99a/fubatoromugiguxam.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/hnuli1pklt79fqnjc7inri10d9/13603803363.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/d5ccc7d2bc297d583368891fc61982ea/warozilefonu.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/wonekokotofaxatozam.pdfIn PDF document text
    • http://jmyhship.com/uploadfile/files/ripevanologujigav.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/de1023cbe444b7cdc8794208a70c0dcb/28855111803.pdfIn PDF document text
    • https://museuminiaturesbesalu.com/files/53363129711.pdfIn PDF document text
    • http://www.halpellet.hu/userfiles/files/7542497581.pdfIn PDF document text
    • http://klpa.net/userData/board/file/nolinuwikoxilupe.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/ba0dd144f01cd166557ee976c37a8a47/41618241158.pdfIn PDF document text
    • http://s-moonlight.com/CKEdit/upload/files/bakabitejalewukejuxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=australian+passport+application+pdfPDF link annotation
    • 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_off0000bd99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD99 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d5ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5AB 15488 bytes
SHA-256: 77f7cfa1c67b050674ece0791f3ed89ca022677d47fd34af70697a3173b49bce
font_02_sfnt_off0000fd19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD19 10564 bytes
SHA-256: 76e0a88508fd6fd82e75cddf4522d63eb5bdaf660b2fa1b2a5aed3c23cbe5abe