Malicious PDF — malware analysis report

Static analysis result for SHA-256 2be7598b6a16fc8a…

MALICIOUS

PDF

83.6 KB Created: 2021-09-10 03:01:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a365e65d59ea625bb89076503b0c279c SHA-1: af9ddcdfa716daebd274ef6d3ab98871bcc06e4f SHA-256: 2be7598b6a16fc8ae5257b07498381060ff4489f2b638b933d0b118941848b6b
96 Risk Score

Malware Insights

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

The PDF contains a large number of external URIs and links to compromised WordPress upload storage, indicating it functions as a link farm. The ML classifier strongly flagged this PDF as malicious, suggesting it is used to distribute further malicious content or lead users to phishing sites. The presence of multiple compromised CMS upload links and disposable hosting links reinforces the malicious intent.

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://pistant.ru/uplcv?utm_term=best+ds+android+emulator PDF link annotation
    • https://kiaavcilar.com/upload/ckfinder/files/femix.pdfIn PDF document text
    • https://duvanco.be/docs/files/34948025788.pdfIn PDF document text
    • http://blfimmobiliare.com/userfiles/files/29579986728.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/wokire.pdfIn PDF document text
    • http://unicaconsultoriarh.com/images/files/96836634859.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/0ls03e8b77cpnlq0i77208ffd5/kipuzukegilegazalela.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131839da57b6---bamukozo.pdfIn PDF document text
    • https://luatsuavina.com/userfiles/file/66082286543.pdfIn PDF document text
    • http://homeshopeez.com/uploaded_files/userfiles/files/80413117783.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/161302fdaa71f9---30071417029.pdfIn PDF document text
    • http://uts.edu.co/portal/app/ckfinder/userfiles/files/diwexaz.pdfIn PDF document text
    • https://loyd.rs/images/file/42769593828.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613981583b386---pugijefeba.pdfIn PDF document text
    • http://kleinschadenexpert.com/userfiles/file/govavev.pdfIn PDF document text
    • http://prestopc.it/upload/file/basekesow.pdfIn PDF document text
    • https://aromamarketing.md/img/files/52658184623.pdfIn PDF document text
    • http://barrospizzadb.com/uploads/files/mupefulejo.pdfIn PDF document text
    • http://111-orte.com/testarea/cwsCMSlight/media/files/45005333773.pdfIn PDF document text
    • http://velomagazin.hu/UserFiles/file/43318314902.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/161371b187bd41---32399334576.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161390e2764516---92799775466.pdfIn PDF document text
    • https://mondoaudio.it/img/uploaded/file/potabufubepopetorisukemu.pdfIn PDF document text
    • http://okudshava.ru/userfiles/file/89761745576.pdfIn PDF document text
    • https://jmcoverseaspvtltd.com/uploads/files/muxovawosabubuze.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_off0000e0a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A2 18576 bytes
SHA-256: e755f3bcef9de71ed684adb814850144e4fa78522fdec3eb1a07566a3fa83db1
font_01_sfnt_off00011080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11080 10560 bytes
SHA-256: 106167cbe3a0d0ee0ba65a8a3ef01768c706bebf723cd0969afaf98a0225d62e
font_02_sfnt_off00012895.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12895 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1