Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b1388785a55d4e5…

MALICIOUS

PDF

74.2 KB Created: 2021-09-29 13:43:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: dbf89389b8f751316ba920f4773b5e4b SHA-1: 0baebab48661efa20fb4ffc3ef71907e13567594 SHA-256: 8b1388785a55d4e5aabde8e0b1700dffdf052989298b729364cd142b478984be
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, forming a link farm. These links likely lead to phishing pages or further malware downloads, consistent with a spearphishing attachment delivery method.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crysiq.ru/uplcv?utm_term=s21+ultra+vs+iphone+12+pro+max PDF link annotation
    • http://sartor.ru/upload/files/lozogolafitokusi.pdfIn PDF document text
    • http://www.prakashirrigation.com/uploads/fck/files/37445159022.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/lujubapadagi.pdfIn PDF document text
    • https://jucariicopilasi.ro/app/webroot/files/userfiles/files/valibinumetexuzotajit.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/16137509aa2059---savepizamorozokigarixa.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210919113146.pdfIn PDF document text
    • https://loyd.rs/images/file/pekaxezitokuwibap.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210904205054304.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/161419187b87a0---jomobuxuzininekomorir.pdfIn PDF document text
    • http://packturf.fr/files/9451470613.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16153e3b110d0b---50774306879.pdfIn PDF document text
    • https://cobrawire.com/userfiles/files/40080549825.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/9ti22t0vcc8ali470fgv2nrjb7/38721953489.pdfIn PDF document text
    • http://domuran.pl/files/file/gimonujegakivagipor.pdfIn PDF document text
    • http://gangwonbnb.com/FileData/ckfinder/files/20210916_C60EBEF821DED64A.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/161524d99e8011---rivene.pdfIn PDF document text
    • http://eventologia.com/userfiles/files/rowuduvubaxiwaj.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/luvajazigo.pdfIn PDF document text
    • https://pyccenter.com/images/Upload/file/tewenolo.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/161543cf6bd863---juvemorisatobodiwodekagar.pdfIn PDF document text
    • http://cp-1.ru/userfiles/files/35373271669.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/b55b19df54a6ead97172133ba66d0516/befamoxafagumitifupinej.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161412f0ba6f27---norofovedamudu.pdfIn PDF document text
    • http://studioriboldi.eu/userfiles/files/sazupat.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_off0000b7f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d00c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD00C 11032 bytes
SHA-256: 1bb9183139bb276645be040c06ce1e97a7bdeff9157a838f8c1ff5b7f03844d8
font_02_sfnt_off0000e99b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE99B 18828 bytes
SHA-256: 6fbb8f1e08f4d78d2d1cbf82b39b35ed02896de2ad5d09006e65c98eadaa0508

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