Malicious PDF — malware analysis report

Static analysis result for SHA-256 e96c93ddcdd6b60e…

MALICIOUS

PDF

81.3 KB Created: 2021-09-13 00:17:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 638a3e914b364c515057d5d5123e6c29 SHA-1: 38f801a988b10a6f4a1400f7b017c351fcec0759 SHA-256: e96c93ddcdd6b60e1e2ef2cfbbf6ccd3e786949d2b0c1b81055617a98e2ba3c7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to disposable hosting or compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://tele-klass.ru/i/upload/files/41889584149.pdf In PDF document text
    • https://quangcaowebsite.xemlaco.com/uploads/files/38674718100.pdfIn PDF document text
    • http://pn-tech.net/userData/board/file/xofemasixarebuxelup.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/nazalu.pdfIn PDF document text
    • https://upaspor.com/resimler/files/bubafefir.pdfIn PDF document text
    • http://soskuwait.com/outscapes/admin/ckeditor/uploads/ck/files/nekututitop.pdfIn PDF document text
    • http://pxmonastery.org/CKEdit/upload/files/82049330222.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/14961828168.pdfIn PDF document text
    • https://sysyanginguvenlik.com/uploads/files/36889657645.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021090420513873499.pdfIn PDF document text
    • http://cctechlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rubipamive.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/161367f931c3e1---turefunanagapapijedasoke.pdfIn PDF document text
    • https://coonvalleycc.com/userfiles/file/zetabesibezexav.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161353373898c2---vofenemewapoli.pdfIn PDF document text
    • https://lotte-ppta.com/beta/assets/file/10597533700.pdfIn PDF document text
    • https://pakianco.ir/data/image/uploads/news/files/sodomafulas.pdfIn PDF document text
    • https://semsaesp.com/ckfinder/userfiles/files/4841898613.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132ed31015df---97964673929.pdfIn PDF document text
    • https://novamakine.com/upload/ckfinder/files/vividaseki.pdfIn PDF document text
    • http://3dsami.org/uploadfilefiles/lunurefen.pdfIn PDF document text
    • http://pokebarslo.com/uploads/files/19927193774.pdfIn PDF document text
    • https://ww150006.linebot.net/upfile/files/20210906121012.pdfIn PDF document text
    • http://guojingmall.com/userfiles/file///87087142710.pdfIn PDF document text
    • http://selfmadefilms.nl/userfiles/files/wudeladurixoz.pdfIn PDF document text
    • http://myphamasia.net/upload/files/46212059770.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=launch+an+app+on+play+storePDF 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_off0000d979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD979 17592 bytes
SHA-256: 19458e2912b912d924c824a5bf5b8cb3dc3d3845e2545606c87e8cda3388a449
font_01_sfnt_off0001070f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1070F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011f26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F26 10552 bytes
SHA-256: e082ec5ba7f751faa3e7a9ccc53751739f71d4c1d3597ad4ba0b77f9fa6763e5

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