Malicious PDF — malware analysis report

Static analysis result for SHA-256 c04ae4e6643a96eb…

MALICIOUS

PDF

93.5 KB Created: 2021-07-25 14:52:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6ef064e5d7e7b77103d8a11966711397 SHA-1: e737f429102126ce2d3ca3ca776822d7b8dd49e1 SHA-256: c04ae4e6643a96eb4f2ad5cf71629bfa439980e9cdbc1c099683aecdee6e3e4b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a link farm pointing to compromised WordPress sites, indicating an attempt to distribute malware. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of embedded JavaScript suggests it may be used to facilitate the download or execution of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 7

  • 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.
  • 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://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/209d2f9a9f6df9e83cb17769ad96a9de/27943638766.pdf
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/2ecc9aeaa74821f776cbb816825b6846/bumuwaxizazaja.pdf
    • https://vietnaminsight.biz/ckfinder/userfiles/files/88987545023.pdf
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608afa266b531---fitisor.pdf
    • http://chhsclassof70.com/clients/1/1f/1f6d1b94cf555b90b9f410dfa82aea5f/File/32684037741.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160703a65a9fa0---vefoniz.pdf
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/2281447132.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/74n6434cosuljdla3re853gap6/fenilexuzobovojowigigeku.pdf
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/hai5bj0e17a3iu7soch4vr5t45/sipimixibeta.pdf
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083b02be2941---lupefeneza.pdf
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16090322163fef---demogatopujowe.pdf
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077f396e02a4---giwabiloxibufiboxavogorev.pdf
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/99d2bf32b18fb3461018a2cac674a947/77066413492.pdf
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/160902d3f3e7a9---sejivit.pdf
    • https://limsurdua.com/contents//files/doxilepovibato.pdf
    • https://5a.ro/ckfinder/userfiles/files/tinuxi.pdf
    • http://stepasidemedical.com/images/uploads/file/kigizemu.pdf
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/209d2f42c34ef80a35d36d12fac76f45/widokinuritigifezanofubo.pdf
    • https://dalilak1.com/userfiles/file/velivupuwane.pdf
    • http://poiskvod.ru/images/file/51608427155.pdf
    • http://paintmaster.hu/js/ckfinder/userfiles/files/15820462677.pdf
    • http://vietsaovang.com/uploads/userfiles/file/32075783170.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=baixar+o+filme+bloomington+dublado+completo
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb25.bin
97e3f73a58ccdd4784c9ae1678d9f90717e6b6d0c87c36bf93adb8865ef65ebd
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB25 16192 bytes
font_01_sfnt_off000100b1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x100B1 16792 bytes
font_02_sfnt_off000118c3.bin
515a146cf311b6fcad4ffbb0eb158938abd1abbce9837472bf52990024535908
pdf-font-stream PDF embedded font (sfnt) at offset 0x118C3 20128 bytes
font_03_sfnt_off00014b88.bin
4cbed9739589746fc1d14cb734fdc2ee2d0042a0054a8eaca241c9c03153a78a
pdf-font-stream PDF embedded font (sfnt) at offset 0x14B88 11192 bytes