Malicious PDF — malware analysis report

Static analysis result for SHA-256 da61c28506e3af97…

MALICIOUS

PDF

81.0 KB Created: 2021-09-14 14:12:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d5630d46f72dfeba7d5e29c91b4df583 SHA-1: 8da74c01f33cd0e212117fc84b9b640591e688d6 SHA-256: da61c28506e3af971953fe97c44fa91af136a8521796b6b101e4e070791c41b9
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by an ML classifier as malicious and contains numerous embedded URLs, many pointing to compromised CMS uploads or disposable hosting. This indicates a link farm designed to redirect users to external sites, likely for phishing or malware delivery. No scripts were extracted, but the structure suggests a malicious document intended to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/80ac8d99018032e71632484e62fb6e17/letolesopusunoz.pdf In PDF document text
    • https://grnca.org/img/files/files/86253225312.pdfIn PDF document text
    • http://ecoaga.com/documentos/file/61521943667.pdfIn PDF document text
    • http://acudrved.com/ckfinder/userfiles/files/jefivipi.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/161314431b45cc---zonanurodutamipup.pdfIn PDF document text
    • http://ctm.it/userfiles/file/vonufobujojatebapub.pdfIn PDF document text
    • http://mcutech.net/upload/2021/09/file/16307194312061875431.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/dukuriposivumisapumom.pdfIn PDF document text
    • http://sithome.com/upfiles/file/20210914140855.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc62460796---defebezebolatojod.pdfIn PDF document text
    • https://giritrademark.com/content_files/files/fesubiforupumojufasat.pdfIn PDF document text
    • http://naturpix.ch/cmsimages/file/gezajibutezagirej.pdfIn PDF document text
    • https://mrpressconsulting.com/UserFiles/file/60993610218.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613caad9b26b7---lixir.pdfIn PDF document text
    • https://santa.sg/images/users/00000000/files/vozufudadofonofuwid.pdfIn PDF document text
    • https://tuinvandecruys.be/file/92153360994.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/421162799dc9171be306764a91797009/dudesadosevenomesasinojib.pdfIn PDF document text
    • https://saptabangunmanunggal.com/indomobils/upload/file/mudumarofezon.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/74259682630.pdfIn PDF document text
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/pelomamivel.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f606934fd6---57583620176.pdfIn PDF document text
    • http://dmkert.hu/files/file/pupazifelewelelix.pdfIn PDF document text
    • http://reylab.com/userfiles/file/70915752022.pdfIn PDF document text
    • https://ice-group.pl/userfiles/file/daloxix.pdfIn PDF document text
    • http://hugslock.com/app/webroot/img/files/guzixedewozonomunomazos.pdfIn PDF document text
    • http://dongphat.net/upload/files/21290886903.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=jaringan+telkomsel+lemot+di+androidPDF link annotation
    • 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_off0000d98a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98A 16808 bytes
SHA-256: b3ae19cf7337e083f505a38a27a32e710c36814229a4c9f820d2cc7bec407275
font_01_sfnt_off000105ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011de1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE1 10676 bytes
SHA-256: fbd3e28868c2a7df2158ae35d56e5ff99be2544f7a54e38583cde3d5a5972519

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