Malicious PDF — malware analysis report

Static analysis result for SHA-256 33bc7b999536f988…

MALICIOUS

PDF

81.4 KB Created: 2021-09-04 19:29:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 89b6d0fa7a3f4a049fadf6036ee76217 SHA-1: f97bb1cc465f6d580bbdae4c2d394c8168cf63bc SHA-256: 33bc7b999536f988c0ad73b87207b48c0805f0f17aa69f34b3542302fb09af5d
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://jump360.co/upload/files/20210831005435.pdf In PDF document text
    • http://rescue119.org/userfiles/file/88458382319.pdfIn PDF document text
    • https://pfhotel.gr/ckfinder/userfiles/files/xewuna.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/e35f69c6eb861ce0e5759598250600eb/wakol.pdfIn PDF document text
    • https://avenue102.com/uploads/file/fuzut.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/zarusunonujozolepozipa.pdfIn PDF document text
    • http://gruppocreta.com/userfiles/files/nubepesojobodoferezevojix.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/4cbf1b3f880e85c6f32f6f1393222125/sipilotoxolixigi.pdfIn PDF document text
    • http://cuacuonanbinh.com/userfiles/file/65440350256.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/6387255070.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b7dfa9caa4f---kofejifatijulibuve.pdfIn PDF document text
    • https://hazeloyun.com/calisma2/files/uploads/6874023201.pdfIn PDF document text
    • https://livermore.com/wysiwygfiles/file/94267641665.pdfIn PDF document text
    • http://cellesekorea.com/ckupload/files/84865557383.pdfIn PDF document text
    • http://ash-graphy.com/userfiles/file/14180401031.pdfIn PDF document text
    • http://gk-eventus.ru/admin/ckfinder/userfiles/files/81181797532.pdfIn PDF document text
    • https://successalpha.team/upload/files/77523309437.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b228c111d20---54154539495.pdfIn PDF document text
    • http://jaika.in/images/documents/files/waxipop.pdfIn PDF document text
    • https://yapluka-services.fr/userfiles/file/lolavirokemulekitanazufi.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/teremu.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/rowofas.pdfIn PDF document text
    • https://aqua2go.pl/galeria/file/67002997.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/geluxotedemofi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=iata+codes+pdfPDF 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_off0000da5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5D 17904 bytes
SHA-256: 7f99ad3e770405c27577b4195cda362b52815838d6906a4bbb308394c36640bb
font_01_sfnt_off000108c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C7 10224 bytes
SHA-256: c66335b36799f90fce7faa1c9f4a2b7c91420a9f411614e0650a0aba022273c0
font_02_sfnt_off00011fe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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