Malicious PDF — malware analysis report

Static analysis result for SHA-256 47759d1964789731…

MALICIOUS

PDF

75.2 KB Created: 2021-09-08 01:55:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c4d9caee74205c22163fea69781bf880 SHA-1: 0c82040152414a8b53d10dece1e8aff8d1efc253 SHA-256: 47759d19647897313c63304d251db7aed8803f0226339d2a07083bcbcfee06d0
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 links, many pointing to domains associated with compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The ML classifier strongly indicated maliciousness, and the structure aligns with techniques used to distribute malware or engage in SEO spam. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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=road+material+testing+lab+manual PDF link annotation
    • http://tele-video.ru/upload/files/sizurexejarugikufaxo.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160af9dbb1d5e0---70208141819.pdfIn PDF document text
    • https://castel.ro/userfiles/file/23620535088.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/ziveverigevowagonu.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16107ccd51ab94---27666559563.pdfIn PDF document text
    • http://tillmanfamilyreunion.com/clients/b/b7/b7385abc5988d1ee605fea7695e3d00e/File/sitejesatitav.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/jl9on5qjdqklcvsnfhkct89gu4/74613467715.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/161003abf57238---taxedikoxenero.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/gulikowugeroliv.pdfIn PDF document text
    • https://whitesal.com/data/images/file/2403_20210708165621.pdfIn PDF document text
    • https://www.igescanada.com/ckfinder/userfiles/files/8046015963.pdfIn PDF document text
    • https://phongkhamtamthan.net/uploadeditor/files/gigaloboku.pdfIn PDF document text
    • http://ceraunavoltapizzeria.it/userfiles/files/nazovup.pdfIn PDF document text
    • http://anpo.vn/upload/files/63768230631.pdfIn PDF document text
    • http://stewartreunion2020.com/clients/2/2a/2a0d9dcdd57715375c9f4393c24df0f2/File/newafexekedowesaj.pdfIn PDF document text
    • http://autothudo.vn/upload/fck/file/gageludegasofod.pdfIn PDF document text
    • https://itchanoi.vn/uploads/news_file/xidavenon.pdfIn PDF document text
    • http://ktcz.eu/files/files/53741180337.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/433432f69dd51d0eae9bd0ddcbef299f/woweweb.pdfIn PDF document text
    • http://xn----7sbabjkhbzbqti4a3apfmdd2s4b.xn--p1ai/ckfinder/userfiles/files/gatowizipededogifa.pdfIn PDF document text
    • http://hhoasis.org/app/webroot/img/fck/file/87228630589.pdfIn PDF document text
    • https://fleseriuassociates.ro/files/file/bizazuza.pdfIn PDF document text
    • http://studiobonvino.com/userfiles/files/falug.pdfIn PDF document text
    • http://quaisetoiles.fr/img_pages/file/29354190764.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_off0000c145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC145 17340 bytes
SHA-256: f463bee1c2685d6f48c9c41d3b05a086481feac69116f293c916a34d406a8246
font_01_sfnt_off0000ee27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE27 10876 bytes
SHA-256: 387d7ff2a8b13b62526458aff9257a1864fb16bba2fc737bedf3354fe6fd5b6d
font_02_sfnt_off00010709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10709 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1