Malicious PDF — malware analysis report

Static analysis result for SHA-256 26b556dc088c6566…

MALICIOUS

PDF

75.1 KB Created: 2021-09-15 22:53:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: aef007b02e9e6e6d9a4a3f7f662786d8 SHA-1: a9198ed93c5325de89dab57506ebff91d38f5b46 SHA-256: 26b556dc088c65663f39446da37cc8028409cbfe63d7fb0e3bcb1607c1d73001
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting. The ML classifier strongly indicates maliciousness. The embedded JavaScript likely serves to obfuscate or initiate the redirection process, while the link farm aims to lead users to malicious content.

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 https://synerhu.ru/uplcv?utm_term=long+iron+ball+position PDF link annotation
    • http://the-bom.kr/upfile/files/92111161381.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16134dcc89eda5---dopuzaf.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/38e3fb1f19b8f6f17ac5a38f9a190577/53362230238.pdfIn PDF document text
    • http://drzwiukryte.pl/userfiles/file/buperitodexetit.pdfIn PDF document text
    • http://wlpp.net/images/blog/file/34986706750.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161409b50e91ed---29907787107.pdfIn PDF document text
    • https://kaptenhoki.info/contents/files/26150564592.pdfIn PDF document text
    • http://wolfpackbasketballacademy.com/content_docs/xaladog.pdfIn PDF document text
    • https://un7un9b3rl1pa7-99.com/contents/files/manetazoliju.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/77117262091.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/siwalezevibemabagibif.pdfIn PDF document text
    • https://www.displaysdirectaustralia.com.au/application/third_party/ckfinder/userfiles/files/20783556660.pdfIn PDF document text
    • http://okna-kursk.ru/page_edit/_samples/userfiles/files/jutitibozupox.pdfIn PDF document text
    • http://espressobuilders.com/app/webroot/files/userfiles/files/xopasapuxovabit.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/161381d0ab11a8---kulibagadu.pdfIn PDF document text
    • http://www.addvanceo.info/userfiles/files/fajovokugugugazap.pdfIn PDF document text
    • http://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/45577499990.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/42482106760.pdfIn PDF document text
    • http://theofficefurniturestore.com/ckfinder/userfiles/files/vitafenogodijo.pdfIn PDF document text
    • http://smsalumni1971.com/apadmin/uploads/userfiles/files/10913930319.pdfIn PDF document text
    • http://brava-ekb.ru/userfiles/file/73582561402.pdfIn PDF document text
    • http://peggylittlelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/30050290853.pdfIn PDF document text
    • https://grafconsulting.pl/Upload/file/55054642955.pdfIn PDF document text
    • http://www.cst.rnu.tn/js/ckfinder/userfiles/files/4039055913.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_off0000c5ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5AD 16248 bytes
SHA-256: 03761913a4bc7c5874151196cc132132783f200691fae7df2802a62e2fe9e3b9
font_01_sfnt_off0000ef4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10766 10392 bytes
SHA-256: 017133d731f8752fca093f87ea03482cecb80fb27f33f31b6d5df96da2b12599

Open this report in the interactive analyzer, or submit your own file for analysis.