Malicious PDF — malware analysis report

Static analysis result for SHA-256 31744e0178e18906…

MALICIOUS

PDF

73.7 KB Created: 2021-09-06 05:59:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3c7788251c7cf543d02d9c24c9e6b6a6 SHA-1: 8ce5c8417e2fab1322619dd5f706f653359ff4e8 SHA-256: 31744e0178e18906021838ba12a9cee478c8f61dcc83aedf3a68244b77f286ed
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many hosted on compromised WordPress sites, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to deliver a second-stage payload or lead users to fraudulent content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

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://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/a0be0093284cd70d80a4bf2bffa3da95/galema.pdf In PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/34v58tb7sekb2dtukh779e3uog/27451857966.pdfIn PDF document text
    • http://poddertradingandindustries.com/userfiles/file/powepuritepesogemax.pdfIn PDF document text
    • http://fred-robin.com/ckfinder/userfiles/files/42860270834.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16109669d79846---17404234216.pdfIn PDF document text
    • http://armiikrajowej36.pl/public/upload/ckfinder//userfiles/files/ginevirefajubu.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/nowifetepi.pdfIn PDF document text
    • https://auto826.com/uploads/files/24595099494.pdfIn PDF document text
    • http://dogninja.com/userfiles/files/61757326239.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/gofamesuxapa.pdfIn PDF document text
    • https://sonarmusic.hu/up_image/file/78032789256.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee0be51da96---rogusagimarogubudavorenur.pdfIn PDF document text
    • http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/vazizanotebinodux.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/27905928510.pdfIn PDF document text
    • http://blackshirts1962.com/clients/f/f2/f245580d3072b78cda2271cf7a7e3f61/File/3964824741.pdfIn PDF document text
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/77163807724.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160829f5286c4d---zufida.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/xepotimu.pdfIn PDF document text
    • https://nenanhduong.vn/Upload/files/58815895630.pdfIn PDF document text
    • https://luminex.pl/upload/file/kopurujimugumiribod.pdfIn PDF document text
    • https://virtrade.gr/userfiles_lybo/file/rurapokoximam.pdfIn PDF document text
    • http://rkmaster.ru/uploads/files/birukuvirovanovavo.pdfIn PDF document text
    • http://worshipedia.net/sites/default/files/file/rubikukew.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/dq1570j8m1eitb3h08rjv4i9d7/ximerir.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/buduwelurodewemezovid.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/oji934i2sdt2ub1cm0j09chju3/76598853465.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=determine+tone+worksheet+answersPDF 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_off0000c379.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC379 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB90 10504 bytes
SHA-256: 5f214e0449accc9740c40afb0f8db8f4ef2434092c908a382469a116ac6f5769
font_02_sfnt_off0000f359.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF359 14976 bytes
SHA-256: 350b3427d1dbce05b16ca651c3a845b8cebab4444459583036c45f16f93f3e54