Malicious PDF — malware analysis report

Static analysis result for SHA-256 2959834cb7335d14…

MALICIOUS

PDF

97.5 KB Created: 2021-08-23 21:41:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ed825ab054547a2cbd9b55295b1aa323 SHA-1: 58d6a17710b2e5ed94f0d1d0d6890875c3b6cb9b SHA-256: 2959834cb7335d14165cfb8788e09ebe3024625cc5dcac256b522b81d10238ef
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and a large number of external URIs, many of which point to compromised websites. These links appear to form a link farm designed to redirect users to potentially malicious content, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9733

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/9lo6pu2kvefla5ssf4v6j0e6uj/8241216428.pdf In PDF document text
    • http://waterlootour.com/FileData/ckfinder/files/20210803_A5B9DE2FFE6BEEDC.pdfIn PDF document text
    • http://mackyz7automotive.com/js/upload/files/sebibewow.pdfIn PDF document text
    • http://prosquash.by/data/15966077506.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/96409889772.pdfIn PDF document text
    • https://amenajarisiconstructii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc2a61386d---sijijoradomipimas.pdfIn PDF document text
    • http://kirche-treuen.de/UserFiles/File/zamidiwekuz.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/3319732454.pdfIn PDF document text
    • http://finara-v.com/file_media/file_image/file/jidafuwe.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/kobixu.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/76a3560d110167635afffb0a6132b15d/xumomijejexipuxu.pdfIn PDF document text
    • http://dailitara.lt/bites/uploads/file/64505283972.pdfIn PDF document text
    • http://www.eurosecurimed.com/ckfinder/userfiles/files/63811617878.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/vc4bqj9g3avdorcg35pc5qldmj/rotixikerazumiwifus.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f744276d10d---ribavinere.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/datevekuwezoguju.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/mufifiromevij.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160779f6f39584---17548498597.pdfIn PDF document text
    • http://www.farmaciavictoriayjmleon.com/userfiles/files/golixiliwodo.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/dutisosi.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160da0e6a5ec5f---sebapiguwuxiwulazanegovem.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091a8da848bf---nezisabivisanipewok.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/6c5df65b8ee80a8f2edb1e57271b51d3/xoxawoxifawegijepata.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/7040d74c1ec5222710d9e4e23c1a70d4/vimusofe.pdfIn PDF document text
    • http://brukbet.com/user_images/file/xujix.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/dexogexakax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=plants+vs+zombies+2+full+version+download+for+pcPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fda0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000115b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115B2 17904 bytes
SHA-256: 5fa819da2849d1445508a86c149bf634f10d2d3e2e27494460e91f46213e2133
font_02_sfnt_off000144e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144E2 11352 bytes
SHA-256: 4e0a8bdf2bf784c14b798a45382a6f7ff2a89b6982f539c8a3557aaf38bf7d0c
font_03_sfnt_off00015f88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F88 16404 bytes
SHA-256: bc5200df22c49a4358bfb95a697e603ab6d2ce88810087a79ff2c7dc33c27074

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