Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7f46a98df56c257…

MALICIOUS

PDF

83.1 KB Created: 2021-08-18 21:25:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a9bd2b4b423eda106a8030ac04a65eef SHA-1: e88477f47f56d3bcdfb0e32012a843b4049294fe SHA-256: a7f46a98df56c257c14eb280592fea8159181fcc247222a03ab629832a6d1279
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to compromised WordPress sites, likely serving as a lure or redirect to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://garglob.ru/uplcv?utm_term=minecraft+1.7.10+hexxit+mod+paketi+indir PDF link annotation
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607a78fbe9a5b---50698837236.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da6e4f96af3---kuwutoraligixo.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/9461de7a817e7b6ee0daacf33b8a9238/85512602874.pdfIn PDF document text
    • https://activepymes.com/pub/file/fipafupotego.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/lulepozemelologiki.pdfIn PDF document text
    • http://hoangminhphatkorea.com/webroot/img/files/95323992538.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/kojuvibifi.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/afaf61a38d8f75f8d6ed5648608f2fcc/56837312398.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b6284b82bdf---pifiwulazosewabodege.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/suwizizitoxekonoveror.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076e13e8a577---fexofafidogumixag.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c395bec206---82528226875.pdfIn PDF document text
    • http://perechen-jurnalov.ru/js/ckfinder/userfiles/files/zutis.pdfIn PDF document text
    • http://clubmaniacr.com/campannas/file/kipefuwuxuzivikurox.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/f618083ea23974ec410643d3fed299f8/4399347072.pdfIn PDF document text
    • https://t2sc.me/userfiles/85631970146.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160fd47695e3bb---13052673751.pdfIn PDF document text
    • http://scottleddy.net/clients/862555/File/senolunesogovari.pdfIn PDF document text
    • http://vucert.vn/uploads/files/fuxarakegob.pdfIn PDF document text
    • https://bio86.net/fichiers/gevorofegime.pdfIn PDF document text
    • https://caravanandre.it/wp-content/plugins/super-forms/uploads/php/files/6267c80d878645e05bc418c30e7a33a2/43020855768.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/148fb22db12c9795ed9164e6898535ee/vikopuzaduxa.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a7aae432341---96326851607.pdfIn PDF document text
    • https://maugli24.ru/wp-content/plugins/super-forms/uploads/php/files/91b66f00e74c230da8771df82e6cf0f2/84548112912.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/140cfd56771ccbb31a7da51f21835ec1/26789414232.pdfIn PDF document text
    • http://lyjclinic.com/ckupload/files/41048933438.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_off0000d2d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE5 22484 bytes
SHA-256: f1f2be60377190138c4fe7cf206ae07702885a010c392a24699cd084f13422a7
font_02_sfnt_off00012240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12240 11148 bytes
SHA-256: c6bf48d4c805daf9e2c0ba0fd3578cbfdc441dd2df60209670954c8b3052ceed

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