Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ee84dde414d5b9f…

MALICIOUS

PDF

85.9 KB Created: 2021-09-05 15:22:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 342f4882e99745245b73ca261d0cd460 SHA-1: fd01fa989ac7b429d3204726f3e0cf5f2aab9bb3 SHA-256: 2ee84dde414d5b9fdec0779ba0d25f4b3d643b6b408d113fec221e7618737732
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress upload directories or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, suggesting an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://krisoc.ru/uplcv?utm_term=cours+de+droit+civil+les+personnes+congolais+pdf PDF link annotation
    • https://abandassociates.com/ckfinder/userfiles/files/11905583019.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d0b423d1d82---zivelunotaxejak.pdfIn PDF document text
    • https://truonggiangcompany.com/userfiles/file/gupugetaxovunodetuxijel.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/h7q2d1ecf8oedvf65gni5i07na/5785907766.pdfIn PDF document text
    • http://solyaris.pro/admin/ckfinder/userfiles/files/28857636790.pdfIn PDF document text
    • http://sterenstein.ru/userfiles/file/61246077019.pdfIn PDF document text
    • https://keluargamimpi2.com/contents//files/zurebolomidefo.pdfIn PDF document text
    • http://alexanderjamesbackcatalogue.com/userfiles/file/89405036695.pdfIn PDF document text
    • https://octvads.site/js/ckfinder/userfiles/files/vuzunoj.pdfIn PDF document text
    • https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/2378812938.pdfIn PDF document text
    • https://ldoris.com/upfile/files/20210724121439.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/84958602039.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/fozixebemutiz.pdfIn PDF document text
    • https://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160940a9b82508---lupukikexijim.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3353d8d515---21004423063.pdfIn PDF document text
    • https://sieuthimaycafe.vn/uploads/file/64216219882.pdfIn PDF document text
    • http://osstemcardiotec.com/files/fckeditor/file/1747796504610fc64a964e8.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16121bbae44294---vajowewajimudabaxiru.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e8c53f3bfbe4cc22d951d8e743f6a530/95914460821.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/9a6959aaabb9f71428654fb18a632f33/31287363431.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4ac2c4e7d8c0b60f6cabc1117b6278dd/samogopo.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_off0000e1ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1EF 21104 bytes
SHA-256: 2128b84217a15e7a3eab4b2c5df11a2b180b93aff4c2f51153ed3ab8a290f596
font_01_sfnt_off00011798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11798 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012faf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FAF 10992 bytes
SHA-256: 3a6bf26142f0be9e27d241cac50f140ff2a9629b7b0a2dcee98b1b33474512f6

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