Malicious PDF — malware analysis report

Static analysis result for SHA-256 c32f575d010128eb…

MALICIOUS

PDF

71.5 KB Created: 2021-09-22 13:59:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6de313c73f4fb6a1480760bfc86e2285 SHA-1: e3d4ccff12f3cb0ccfdcef6db34ac8bb2843ba22 SHA-256: c32f575d010128eb4c4eca047d48a91e5d5ce2a2c606567cb3f3604abaa35e13
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, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, with the file being identified as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://repairbase.net/FCKeditor/editor/filemanager/connectors/php/images/file/rurupuwelul.pdf In PDF document text
    • https://deepex.hu/hirek/files/31247904496.pdfIn PDF document text
    • https://vipbeachhouse.com/uploads/editor/file/rotemozofosinubisomaka.pdfIn PDF document text
    • https://pinkrali.com/calisma2/files/uploads/loguliso.pdfIn PDF document text
    • http://kunmobile.vn/files/uploaded/20210904/file/25280235030.pdfIn PDF document text
    • http://mcutech.net/upload/2021/09/file/1631235003775976066.pdfIn PDF document text
    • http://twinmd.ru/userfiles/file/webimelamadisogevem.pdfIn PDF document text
    • https://htapigroup3.com/contents/files/31313806842.pdfIn PDF document text
    • https://imagebrandstudio.com/userfiles/file/pajoxomulasodegu.pdfIn PDF document text
    • https://excellencetogether.com/img/files/file/67057879274.pdfIn PDF document text
    • http://nhadep30giay.com/uploads/image/files/togasomofesuken.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161484055466db---jalefunexifirili.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/a059b041ae6be665c5c61e6ceef7daab/69956107289.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd6549068e---kujoparigo.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/2e385bbab31abb2034d58d5b2adca058/nigajinapob.pdfIn PDF document text
    • http://hotstamping.pl/files/file/jetezunapadovafofubili.pdfIn PDF document text
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/96149105615.pdfIn PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/dekaporabanutasinowubipon.pdfIn PDF document text
    • https://wfca-czech.cz/temp/userfiles/files/63288308165.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021091017002610.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/7dcb5ca52af2df205a3d055e165438a7/xefebezitemufo.pdfIn PDF document text
    • https://www.rosebankprimary.co.za/inc/ckfinder/userfiles/files/leloj.pdfIn PDF document text
    • https://biocoils.com/img/file/tivijeruseki.pdfIn PDF document text
    • http://osingenieria.com/images/admin/file/fulawuxuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=world+map+longitudePDF 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_off0000b71f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB71F 16104 bytes
SHA-256: d43a3b96d5f2d77afe5644d5c7de4907cc12a22970775273bd4de7c81071aa4e
font_01_sfnt_off0000e027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE027 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f83e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF83E 10660 bytes
SHA-256: d98a3d105046a9dce44adeaaaaa8fa89010d18f32b2004c8ce80a519bcbcb2d4

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