Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a48b0d70f96f7e5…

MALICIOUS

PDF

70.9 KB Created: 2021-09-26 00:09:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b42fae4195e4c58786bb35b2d9ac8fc9 SHA-1: c8fdf7256b77cca2fe9dd1200159d9c442c1c251 SHA-256: 8a48b0d70f96f7e5e0d0cf3931287d52711bb58506ead132df1c11b64bdd51bd
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that point to various domains, many of which are associated with link farms and compromised CMS uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farm heuristics suggests a deliberate effort to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pixomot.ru/uplcv?utm_term=worm+zone+io+free+online+game PDF link annotation
    • http://theprojectmanagement.guru/cote_dor_import/admin/ckfinder/userfiles/files/62443779998.pdfIn PDF document text
    • http://truhlarstvi-strakonice.cz/files/file/90203653901.pdfIn PDF document text
    • http://se-ty.ru/uploads/userfiles/file/raxaj.pdfIn PDF document text
    • http://mijinmotor.com/fckeditor/userfiles/file/67349754580.pdfIn PDF document text
    • http://herium.net/FileData/ckfinder/files/20210923_CAB6A0480F5B1629.pdfIn PDF document text
    • https://aksukartela.com/images_upload/files/9658098098.pdfIn PDF document text
    • http://www.dereformasenalicante.com/archivos/files/76666463782.pdfIn PDF document text
    • http://valentine.tutaylamhet.com/storage/ckfinder/files/wavazuburus.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161320066bfcec---99869478283.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/fqqmrmimltflptlli98g0184v1/79058740055.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/1p0ofpu672fkcc4odmj65thb7k/97275662699.pdfIn PDF document text
    • https://granitabrasive.com/editor_up/muwefi.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/ce277a2f3393fb3fb6ae4022328a85ab/6855008360.pdfIn PDF document text
    • https://www.ventisilva.com.br/ckfinder/userfiles/files/wupivutowufozi.pdfIn PDF document text
    • https://searchlink.org/userfiles/file/29963737895.pdfIn PDF document text
    • http://glovimex.com/uploads/ckfinder/files/razar.pdfIn PDF document text
    • http://izmirtavla.com/upload/file/volalisunufikivimevibak.pdfIn PDF document text
    • http://www.udelimpa.es/ckfinder/userfiles/files/kifemovuzinobabemaxezote.pdfIn PDF document text
    • http://davcpundri.com/css/file/samuziretugojudujepap.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc12eb60bb---suwulixukigox.pdfIn PDF document text
    • http://budgettranslation.hu/sites/default/files/file/suzopatevix.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_off0000b1c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1C7 10344 bytes
SHA-256: 2556326bfa3ca81fb10f4d19d6078ddc9b90a9d9bc54507c41d2893624ce438c
font_01_sfnt_off0000c91a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC91A 16916 bytes
SHA-256: cf6f7113d8c9c51d393c0f4ee4a888146ab31a438a1716a9899caea2aa30222c
font_02_sfnt_off0000f444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF444 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1