Malicious PDF — malware analysis report

Static analysis result for SHA-256 56d2586c9f5e3868…

MALICIOUS

PDF

82.2 KB Created: 2021-09-07 00:11:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5240e0f72c9f0f56418013fc69c44105 SHA-1: d1c2f845515642d1fbd3de3340a5f74ad9729b81 SHA-256: 56d2586c9f5e38683cfc7773ff7b552779b2e9a0179b06b785049825f54cf6a0
96 Risk Score

Malware Insights

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

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://garglob.ru/uplcv?utm_term=ipc+eagle+ct30+manual PDF link annotation
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/16076934d9144f---13263710779.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/5ea7c57c054b6f47733de3281be97a10/10045356716.pdfIn PDF document text
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/filelotasifabobom.pdfIn PDF document text
    • https://aduanaldelvalle.mx/userfiles/file/12988146656.pdfIn PDF document text
    • http://tandprotheses.com/ckfinder/userfiles/files/xorizokukewog.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160be2bf5d2957---davizo.pdfIn PDF document text
    • http://sns.hu/_user/file/52942221340.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16073ca1ca3e9e---vijuxoxigekoj.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/63825560174.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/vaxopobanadesowosigi.pdfIn PDF document text
    • http://yourhealthyanswer.com/ckfinder/userfiles/files/towupuviraxadaxenagom.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1611c593e3297f---puzaxi.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/cc6bcdbb1c775cd09f0caa633e9d7bf8/27655170672.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/45618009445.pdfIn PDF document text
    • https://alutat.com/data/file/rupifo.pdfIn PDF document text
    • https://www.charityweiss.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cfdb91c14ee---84555206297.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/160b1a4f68ebca---26032850166.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/67656659108.pdfIn PDF document text
    • http://ms-domino.eu/images/file/files/miputanumolifuxog.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/nogikenebupikebujizuzak.pdfIn PDF document text
    • http://wu-pao.com/upfiles/editor/files/bapudakuzubepipifovogerug.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/80827127671.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160983434ab4b5---30936957942.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087d1e7aa742---5148014916.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c92a2992cc5---benimoxim.pdfIn PDF document text
    • 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_off0000dacc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDACC 18412 bytes
SHA-256: 54d5e836e722aea53398af1c2189eba3296167c7c448167390cb797232b60156
font_01_sfnt_off00010a9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A9A 10580 bytes
SHA-256: f3ace0fbed86613a69b03e59986b57280ff6ef683ea4448c49929652668b93a1
font_02_sfnt_off000122d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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