Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff8640ae0ec9b2b0…

MALICIOUS

PDF

82.7 KB Created: 2021-09-12 18:57:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: dfa4e28adf6010f8d40f8f78d23a5fd7 SHA-1: 6b83c3ab188ab62d4635fbfa866021bd49ec8b9a SHA-256: ff8640ae0ec9b2b053d17471e1efd672d5adaf9d30c9e33f78ed1676bb89e915
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is identified as a link farm, with many URLs pointing to potentially compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware sites. The presence of embedded JavaScript suggests an attempt to execute malicious code upon opening.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://srmhomes.com/images/bulk_images/files/92101839283.pdf In PDF document text
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/waxenujupolafol.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/wozosenune.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/2201388594.pdfIn PDF document text
    • http://como.gattinonimondodivacanze.it/themes/userfiles/files/71517520432.pdfIn PDF document text
    • https://wemservice.com/ckfinder/userfiles/files/72179860830.pdfIn PDF document text
    • http://odnoklassniki-files.ru/images/uploads/files/14529172537.pdfIn PDF document text
    • http://incomsistema.ru/ckfinder/userfiles/files/83411089220.pdfIn PDF document text
    • http://goldmustang.ru/files/files/8227786276.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/24497924922.pdfIn PDF document text
    • http://geobigoni.it/userfiles/files/fotabesoko.pdfIn PDF document text
    • http://ajej.pretty-match.com/upload/files/7235411527.pdfIn PDF document text
    • https://nuttydog.hu/ckfinder/userfiles/files/41335297558.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16135505eb3b25---76382378355.pdfIn PDF document text
    • https://nhabe.com.vn/ckfinder/userfiles/files/78413300201.pdfIn PDF document text
    • https://zegaoyun.com/calisma2/files/uploads/saguzosoniwevasebodowojef.pdfIn PDF document text
    • http://gs-metals.com/filespath/files/20210902003310.pdfIn PDF document text
    • http://moiarchitekci.pl/pliki/file/47396849082.pdfIn PDF document text
    • http://wonderpanel.com/app/webroot/img/file/54638538238.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16138c76544d46---90418523974.pdfIn PDF document text
    • http://as-eng.biz/userfiles/file/digixedulaxusazudejeg.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/sirilazivukakivawo.pdfIn PDF document text
    • http://jagodkaprzedszkole.pl/userfiles/file/25319154740.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/1bdcf99ca8ea5f104d497328fac1361a/faxediroxoru.pdfIn PDF document text
    • http://xy-interior.com/uploads/files/202109041531201266.pdfIn PDF document text
    • http://www.fishandcosolicitors.com/uploads/files/3236674377.pdfIn PDF document text
    • http://sintjorisparochie.nl/userfiles/file/lugevisuruwerab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=iphone+8+not+receiving+texts+from+androidPDF 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_off0000dc61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f473.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF473 18088 bytes
SHA-256: 2cc3a7b67e57849f605a5edf7538e9494a31595dcdb4ae709128f29f9d49eedd
font_02_sfnt_off000122b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B2 11348 bytes
SHA-256: 33d059c7c85082535b8e97ab3d1e5399fd76d52d4c3bc7c801008f81beea1f8e