Malicious PDF — malware analysis report

Static analysis result for SHA-256 75d83c941f00348a…

MALICIOUS

PDF

89.4 KB Created: 2021-10-22 11:55:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9bdb9de32ec7fa35814031846dce6415 SHA-1: 285aa61877535708e80f5583ac67192974c7afa8 SHA-256: 75d83c941f00348a8ec5b3454c981c0b95b191d7b5ead59786e22f1ec66a6ca7
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to external resources, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to obscure the ultimate destination. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the PDF structure and URI heuristics point towards a social engineering attack to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/2a595af377775f5432453823cfa67a14/milonilolonuboxuluf.pdf In PDF document text
    • https://nulifeus.com/~nulife/userfiles/file/gutulatuj.pdfIn PDF document text
    • http://123podkrovie.sk/editor_uploads/files/42960913666.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/pimimogiwirakozon.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/90146025284.pdfIn PDF document text
    • http://fuzoku-kyujin.jp/ckfinder/userfiles/files/jujapejirilev.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/vaxuwepebeduvitofomosapuz.pdfIn PDF document text
    • https://semineebrasov.ro/printuri-fi/files/bodekovodaromafejega.pdfIn PDF document text
    • http://abbaorphancare.org/survey/userfiles/files/jukenofoxogegij.pdfIn PDF document text
    • http://178.62.148.222:300/ckeditor/ckfinder/userfiles/files/67440046189.pdfPDF link annotation
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141b8a2ae5a3---kinilikedu.pdfIn PDF document text
    • https://uleiuri.ro/userfiles/file/22732701944.pdfIn PDF document text
    • https://aprenda-atdi.com/uploads/files/wefoburivufexot.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/rafumisiwowojesagan.pdfIn PDF document text
    • http://valsadindustries.com/userfiles/file/jidesipaz.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1614161a2c7b28---rejubebonalabalugal.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/popamoxejatuvap.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/161543a36c4fc4---35928363788.pdfIn PDF document text
    • http://batistar.fr/userfiles/file/zotad.pdfIn PDF document text
    • http://nhatrangpalacehotel.com/app/webroot/upload/files/rofudilen.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/161436650f2e80---xudigokema.pdfIn PDF document text
    • https://masukpt1.com/contents/files/81725821449.pdfIn PDF document text
    • http://veewood.com/file_media/file_image/file/77947140105.pdfIn PDF document text
    • http://art-lan.ru/uploads/assets/file/76653723577.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/7xhmvLXWVJc/uplcv?utm_term=carboxylic+acid+and+acyl+chloridePDF 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_off0000f7f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F7 10588 bytes
SHA-256: bb17872df1082ed7394de1fdf50ecebe46447e781369c0793bcb5b055ecd94b8
font_01_sfnt_off0001100d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1100D 18060 bytes
SHA-256: d0e05a52fc168ac890ec7a96494a94f993b9673e8fb96e4a455f356ba01fd093
font_02_sfnt_off00013f93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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