Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9038bb6a1db89f7…

MALICIOUS

PDF

76.8 KB Created: 2021-09-21 00:10:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 9c3c1f4be5387a195014c13ce22fba59 SHA-1: fdf2dbad6637853697c7e22b2c9498f32db34ab1 SHA-256: e9038bb6a1db89f7ff348b3833d22e4be29262c7f226a777958a63641b249866
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to what appear to be compromised CMS upload directories, suggesting a link farm designed to redirect users. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs further supports a phishing or redirection attack pattern. No scripts were extracted, but the overall structure and URL analysis point to a malicious intent to lead users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://ifaistos.reality.gr/~triantaf/images/file/60831505948.pdf In PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16136137aae310---67461796033.pdfIn PDF document text
    • http://qamsar.org/userfiles/files/46487962994.pdfIn PDF document text
    • https://thebottombillion.org/business_school/uploads/file/bezev.pdfIn PDF document text
    • http://skyrybupaslaugos.lt/uploads/files/78745049210.pdfIn PDF document text
    • http://notar-frings.de/userfiles/file/94446037376.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/xojuli.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/wusekivujefasi.pdfIn PDF document text
    • http://czytamzezrozumieniem.pl/userfiles/file/jukosutujulorosufikigog.pdfIn PDF document text
    • http://manpukulivermore.com/uploads/files/66481770706.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/d069bfab7520e7ce526748a1d24d4319/85612727956.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/titanaxexutexewu.pdfIn PDF document text
    • http://taxplus.in/images/contentimages/files/42487549076.pdfIn PDF document text
    • http://xn--sanitrprofi-p8a.ch/fckeditor/editor/images/file/80927459536.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f41ad7c120---fiwugezupom.pdfIn PDF document text
    • https://lenaoyunlar.net/calisma2/files/uploads/senaxawu.pdfIn PDF document text
    • https://o-dance.com/upload/files/pumabu.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/kawakeradufonugofi.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/nipulafuzovigixewaboxu.pdfIn PDF document text
    • http://siblom.ru/files/upload/file/volined.pdfIn PDF document text
    • http://piscesappliances.com/userfiles/file/13873284066.pdfIn PDF document text
    • http://tandprotheses.com/ckfinder/userfiles/files/vivojubenizikumamugevanu.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/divutumofefeteveguzitegu.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0586a75c1---86317080177.pdfIn PDF document text
    • http://associazionemillesogni.it/userfiles/files/rojelisobubazunuvus.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/47c2a0f42a3b313597da724e7a3b402f/97266575058.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=resetting+android+tablet+passwordPDF 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_off0000c706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC706 10836 bytes
SHA-256: 5f7a10440b0c1cd0352482494366b521154a8fe18287afc0ad9a23dc44bf9ae5
font_01_sfnt_off0000dfc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC3 18016 bytes
SHA-256: c2adf7a2bdc2dad8f127e18e191d97daa91621b51bb36bd137d53561000a6085
font_02_sfnt_off00010cf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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