Malicious PDF — malware analysis report

Static analysis result for SHA-256 25911112a47b7f81…

MALICIOUS

PDF

86.0 KB Created: 2021-09-16 23:57:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b3468bd46603d6146d9d3adb150f77e6 SHA-1: 16cc723b3cb158099e30c745df4607a4780f4baa SHA-256: 25911112a47b7f8187d6c1a329dc698722005f268f0bae397ef967d14b80ce8c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, indicative of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://inwebjor.ru/uplcv?utm_term=multiplayer+fun+games+android
    • http://videofilm-tv.ru/content/File/82215985532.pdf
    • http://www.papelerialapiceros.es/ckfinder/userfiles/files/32823696292.pdf
    • http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/46908359837.pdf
    • http://ottuk-e.org/userData/board/file/lidari.pdf
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/3435387913d7303320eecc18493a5826/74506574284.pdf
    • http://salamatekhanevadeh.ir/ckeditor/files/files/94565335483.pdf
    • http://gocoachfox.com/userfiles/file/19781821447.pdf
    • https://viktorina.ledoritulys.lt/files/90388942676.pdf
    • https://rowsontw.com/shopadmin/upload/files/gebinetogapamurerekimofa.pdf
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141b9a22fa8a---80643656330.pdf
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9faa79280---35063374701.pdf
    • https://thuaphatlaihanoi.net/uploads/files/31097613552.pdf
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/66040264756.pdf
    • https://sudhirsachdevaclasses.com/ci/userfiles/files/xopepurevawekizefos.pdf
    • http://hanasushichoice.com/uploads/files/jikilowe.pdf
    • http://quangcaosms.org/media/ftp/file/xebudokexavag.pdf
    • http://palestraarkadia.it/userfiles/files/78987952156.pdf
    • http://xn--lenachatka-57b.pl/uploaded/file/66258406306.pdf
    • https://liur-krd.ru/userfiles/file/47186301364.pdf
    • http://polishingmarblefloor.it/userfiles/files/nawina.pdf
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161321b4e6ca3f---saximoxogijifisi.pdf
    • http://zae.me/datafiles/file/sopago.pdf
    • http://wmc21.com/ckupload/files/36005203510.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edf1.bin
0e4b0a2a4ed724740b83cf6b89d8c777a21387b945d769105b43ea74506df750		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF1 16664 bytes
font_01_sfnt_off000118e0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x118E0 16792 bytes
font_02_sfnt_off000130f7.bin
9e47e93274be8164bce74cb80e8408e203152b8251d71a061b366ce9a2cd5695		 pdf-font-stream PDF embedded font (sfnt) at offset 0x130F7 11048 bytes

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