Malicious PDF — malware analysis report

Static analysis result for SHA-256 83028f9f838fc0a8…

MALICIOUS

PDF

85.2 KB Created: 2021-07-02 04:48:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 9399da4c6a6b67a155450e7a446744bd SHA-1: 4d9bc1f895840e3becd4c5d9b0a05d8c770ba747 SHA-256: 83028f9f838fc0a8e0c0d2482da9092cb2debf10faec372b39f049766d1d2168
96 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as link farms. The ML classifier strongly indicated maliciousness, and the presence of these links suggests an attempt to redirect users to potentially harmful destinations. No scripts were extracted, but the overall structure points to a malicious document designed for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.mueblesgamez.com/ckfinder/userfiles/files/14602083230.pdf In PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5735c4e4b---48267208905.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/18474223863.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/867dd61ec42ca73abdc396b2cd15f9d1/fisipagugitavubakipo.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d5b205628d---fegitedabifeze.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf3ad73736---sarilije.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/1ajjehndn450q220iadpsm8qe5/81773326430.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/1744654518.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210603_88102430F22DB70F.pdfIn PDF document text
    • https://p87.hu/files/mujubema.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/0c754e609c693c809de71e4fafcbb6f9/kotikatidasevuvebabexifoz.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/lq17jsijvss89u0qth44ldbeb6/xoroluvabopoza.pdfIn PDF document text
    • http://ligneus.hu/upload/file/484649472.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/muruzizowik.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/katifagifixafemenixesedob.pdfIn PDF document text
    • http://verdantnorwich.com/clients/3/30/306756bb587dffcd11ca74610d845a16/File/jumozazubisopodewesij.pdfIn PDF document text
    • https://bititechnika.com/uploads/file/59523868256.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/rilubalufonab.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c8c1ead2af5---49402787358.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/21110198545.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/2fee41c6c5db6f7754264b4c351b4719/ruvewuvo.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/4f7794e98ee783293b769d2bd479ad7f/27988617067.pdfIn PDF document text
    • http://polloricowings.com/uploads/files/defefazevememud.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609539d7842ea---73264771203.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=corporate+social+responsibility+in+supply+chain+management+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_off0000ea9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102AF 16180 bytes
SHA-256: 7db38aa3c4d2d9b3094ccbbba2d59f859f1652265f832b499db01324f3f0cc59
font_02_sfnt_off00012cba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CBA 11452 bytes
SHA-256: 1ce91d2ae2edbabd0c3c448a87174d7ff9e1951ed66ededac600f0518ec6d843

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