Malicious PDF — malware analysis report

Static analysis result for SHA-256 78f7ad15e8210f6f…

MALICIOUS

PDF

79.4 KB Created: 2021-08-16 20:26:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 902a125e17740393dec854350e5c5f94 SHA-1: 7243d7965a9b23aea3857b247a0b968d9ca34c80 SHA-256: 78f7ad15e8210f6f7612c946ab3a0376107ab30423d24e455e61bd0355bb21c6
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 pointing to compromised websites or disposable hosting. These links appear to form a link farm designed to redirect users to download malicious PDF files, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The embedded JavaScript likely facilitates the redirection or download process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://blow-w124.com/js/upload/files/kebewisetodikibavirokisa.pdf In PDF document text
    • https://daaeportrett.no/upload/file/9655885885.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/65382392511.pdfIn PDF document text
    • http://spec-so.ru/sites/default/files/file/45678919955.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/161162888c6df7---56281533735.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160946d2470756---widezowoxumonidupute.pdfIn PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/gajetagelor.pdfIn PDF document text
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/9404c8b6f2f301cefdbf550f44cbd4c6/peronasuxefegorigulaledos.pdfIn PDF document text
    • http://ourjamesfamilyhistory.com/clients/1/14/146a9f92d0a296c7c29e793db058bb30/File/46787299242.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/4d6ca8ef8b445fe3c16d1e741ab3f63d/69485089835.pdfIn PDF document text
    • http://ingpoggi.eu/userfiles/files/kafodopipe.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d14f5bbe2---47741021627.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/4788770650.pdfIn PDF document text
    • http://sammyuriasproperties.com/userfiles/files/29361286814.pdfIn PDF document text
    • http://dspec-car.com/js/upload/files/57205247226.pdfIn PDF document text
    • http://ablerexthailand.com/userfiles/files/89586640055.pdfIn PDF document text
    • http://solarexperten.ch/fckeditor/editor/images/file/divukidesukeg.pdfIn PDF document text
    • http://polletnv.be/uploads/files/dovajejozikexobakexeji.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/73549983443.pdfIn PDF document text
    • http://massimoandyuethui.com/clients/69227/File/64095703873.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/406e172bfb0aa710e18bf34802e452a2/82605605682.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/00de607f79ba5797c57c42ea403bf220/xejelixodo.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/aeccd1cf25927d9182de10d0069aa9f7/gofepolixupiv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=chal+mera+putt+2+full+movie+download+okpunjabPDF 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_off0000d1af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C1 16188 bytes
SHA-256: cb155338bf38f7a4e13b73af2ac10e92472af670ec91a5e51d3b2f79b6d23f03
font_02_sfnt_off00011399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11399 11360 bytes
SHA-256: af9a2fcd467d55e7db576bbd63192b8e13347b9f26eab39fddcc528e96e9426d