Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec76647d056e9a30…

MALICIOUS

PDF

88.3 KB Created: 2021-09-08 19:58:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 23ae5f66a7a3543b4ae41017523b464b SHA-1: eba5fdb38f521ff3301cd059d79cd0860beb2045 SHA-256: ec76647d056e9a30579ba0d2ed55026d799442d2350fc4433622ece1b3cd21df
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites acting as link farms. The ML classifier strongly indicates maliciousness. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely to redirect the user or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138a98bbaea1---moferumibore.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135492e6312b---63816101561.pdf
    • http://www.europesolidaire.eu/userfiles/files/zebazoda.pdf
    • http://mayepnuocmia.vn/data/ckfinder/files/26931475678.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/ff146f7cf499ed3cf9e30ab9e4fa7ee6/momilakuruzuzilalevajoz.pdf
    • http://jrpst.pl/userfiles/file/nevonoseg.pdf
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134865678f56---visufegitivaxusajag.pdf
    • https://smsenerji.com/resimler/files/17176791111.pdf
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/posizodikupoxuzopemow.pdf
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16130297d4c06a---bidakukolo.pdf
    • https://textosolutionslinguistiques.com/upload/editor/file/63302376144.pdf
    • http://f-okinawa.com/img/tmp/file/49546509160.pdf
    • https://apoiotelecom.com/imagens/img_fckeditor/file/wuliwefujezinomidoz.pdf
    • http://felixefontesadvogados.com.br/ckfinder/userfiles/files/84520789587.pdf
    • https://matfplayer.com/calisma2/files/uploads/47949437356.pdf
    • http://air-ned.com/uploads/files/nudobusowukovor.pdf
    • http://etepi.pt/js/ckfinder/userfiles/files/dejajodu.pdf
    • http://twtqedu.com/userData/ebizro_board/file/78532009214.pdf
    • http://pi-consulting.ch/download/mijijuzawuruzixudozi.pdf
    • https://glbtrader.com/userfiles/file/xigakozuvolujeg.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613835134d5cb---33167051067.pdf
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/55532487132.pdf
    • http://pensjonatagat.pl/userfiles/file/mewove.pdf
    • https://stdtekstil.com/upload/ckfinder/files/84881006755.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=forex+chart+patterns+pdf+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f54e.bin
ba15feddc94ba380fafb692d19216ac40679221452fb635dcc1b8400349cdd26
pdf-font-stream PDF embedded font (sfnt) at offset 0xF54E 10792 bytes
font_01_sfnt_off00010e32.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E32 16792 bytes
font_02_sfnt_off00012644.bin
41432e0659ac728665967f75fdc63fd6c1dc250f7baf693ab41fc6ce8c862269
pdf-font-stream PDF embedded font (sfnt) at offset 0x12644 17472 bytes