Malicious PDF — malware analysis report

Static analysis result for SHA-256 05cc18a9e0054def…

MALICIOUS

PDF

76.9 KB Created: 2021-09-01 01:01:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1cc34348a9a65af9508c782cd34227e0 SHA-1: 7272e67a7dc13abcc9ec09b42ffe3342279330c0 SHA-256: 05cc18a9e0054def44b081ea36594e6ee2ca9c0f121b64839d1580d308350251
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by an ML classifier as malicious, and heuristics indicate it functions as a link farm. It contains numerous links pointing to compromised WordPress sites and other domains, likely to distribute malware or facilitate phishing. No scripts were extracted, but the structure and URL patterns suggest a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/ba8b728601aea5d757e18c99670a8a2d/85542987491.pdf In PDF document text
    • http://www.village-gaulois.org/gestion/ckfinder/userfiles/files/jemepojufari.pdfIn PDF document text
    • http://shs67classreunion.com/clients/b/bf/bf9552935413f2527bbee995f2dfc9b5/File/liruvibif.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610a1cff91da7---dokufenupekete.pdfIn PDF document text
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1612cd42c5c2b4---rukimibaguvodoxudidetar.pdfIn PDF document text
    • https://agroadvanced.com/app/webroot/newsletters/editor/files/51443204424.pdfIn PDF document text
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/futikowunim.pdfIn PDF document text
    • http://lblussana.it/images/file/refimezabesogejik.pdfIn PDF document text
    • https://braintreeclinics.com/app/webroot/img/files/korat.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160bb9c23961db---65922358064.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/vjbej6crn9q4n5dmr4faqgn2rl/88732550128.pdfIn PDF document text
    • http://energo-market.ru/sadm_files/zoboromosexumalixin.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ad4ec2f55---75760085959.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160832d1b27f58---wokapexetaf.pdfIn PDF document text
    • http://kasargod.net/uploads/file/livonu.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/334a483df6967389422e05835ffe01b9/91836875035.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/bdc3e9e66116affcae4c09e5fd9bb19e/1819572261.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/11687616054.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a631bb966a1---tijunuparejatevami.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d5801fc02---31373465622.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/bijebusisixitolan.pdfIn PDF document text
    • http://win-sonic.com/kida2018/ck_imgs/files/suragalek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=how+can+i+lose+body+fatPDF 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_off0000c9a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A0 16444 bytes
SHA-256: e843a074feae76270b2e352c62b623aa2927825cbb0d189dedeea45f564ae2a7
font_01_sfnt_off0000f407.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF407 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C1E 10700 bytes
SHA-256: 577a60c6d503391e8c063420e5d6f734275dfbda3ef3e052df1047e237f22b22