Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2af61aec5cc6dcf…

MALICIOUS

PDF

69.8 KB Created: 2021-10-03 02:54:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 5ceec3eb8904edbcb3ac5f7624e3e1d5 SHA-1: c5db76d432eda785dd6ba9d2a1dbd2a2333958de SHA-256: f2af61aec5cc6dcf7f5652813963db94d709e4f94a300865f2ca63f0a084e74b
96 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to disposable hosting or compromised CMS upload directories. The ML classifier strongly indicated maliciousness, and the heuristic firings suggest this PDF is a link farm designed to redirect users to potentially harmful content. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://chcial.ru/uplcv?utm_term=a+moment+in+time+full+movie+tagalog+2013 PDF link annotation
    • https://ezastupitelstvo.sk/editor_uploads/system/files/30301541819.pdfIn PDF document text
    • http://xn--djr00fsyfv0o5qgy9u.net/filespath/files/20210923033400.pdfIn PDF document text
    • https://magicdiscoradio.hu/userfiles/file/60155020310.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/77687730470.pdfIn PDF document text
    • https://testagenda1.myagenda.cz/pictures/editor/files/58207862542.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/97907c27dd15bb1fb2acddafeb70d86b/kadovipapobowa.pdfIn PDF document text
    • https://gopherscopes.com/userfiles/file/bebopugusokufejogozopulo.pdfIn PDF document text
    • http://studiorumeo.it/userfiles/files/75614183745.pdfIn PDF document text
    • http://stevis.cz/files/file/gosatu.pdfIn PDF document text
    • http://dnestrovsk.es-pmr.com/constructor/dnestrovsk/ckfinder/userfiles/files/femenaxefega.pdfIn PDF document text
    • https://boumqueur-edition.com/upload/fckeditor/file/7993246283.pdfIn PDF document text
    • http://med-os.com/user_upload/file/wudebuwabupuladoxejunoz.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/6b1c6bf168e6a578ab375c652b25949f/20976395409.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614246d1bb9ee---godixo.pdfIn PDF document text
    • http://ttc-investco.com/img/files/2206957599.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/35878553574.pdfIn PDF document text
    • http://mannaz.pl/userfiles1/file/97975064525.pdfIn PDF document text
    • http://hanaelectric.com/userData/board/file/14390014462.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/970j7tnsf5jh95u2nr6skkj1tf/wugavasedo.pdfIn PDF document text
    • https://cpsguffanti.it/uploads/file/tolapinudimosutuk.pdfIn PDF document text
    • http://tjjjsh.com/uploads/files/20866080559.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/molifazow.pdfIn PDF document text
    • http://honda-vo.com/upload/file/nezazilelupasiwejato.pdfIn PDF document text
    • http://eska-lift.ru/userfiles/file/wufositimasulitafap.pdfIn PDF document text
    • http://coolbiotech.com/upload/files/27353439119.pdfIn PDF document text
    • http://alacarte-husum.de/userfiles/file/80718783854.pdfIn PDF document text
    • https://verner.lt/images/files/22033107431.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_off0000b146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB146 10900 bytes
SHA-256: ec389aa20d0f1bad819d99be1feb668ca00d7a5cf232a9850b5beee7d876c6cc
font_01_sfnt_off0000caa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e2b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B4 14660 bytes
SHA-256: 1ffe5cb51614cc8878f2a2f7781395e2845ba4ccfb87428971c4b2dc63c77070