Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ef256392d2c268c…

MALICIOUS

PDF

85.9 KB Created: 2021-07-29 19:11:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 9314e81aaa546642f74438afdadc4d56 SHA-1: e6b912a65f571844d302494ddf1add4752061ca9 SHA-256: 8ef256392d2c268c5d71d27136656e7fc9f626883034731d32226b0c35f4242e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of external links, many of which point to compromised websites hosting other PDF files. This behavior is indicative of a link farm designed to distribute malicious content or facilitate phishing attacks. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8232

Heuristics 5

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://www.wiz-fac.com/uploadImg/file/gomipaloruwepuzunefopumiw.pdf In PDF document text
    • http://zakuskymoser.cz/www/ckfinder/userfiles/files/98060641412.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160e880f0f0e69---19764544224.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e8df54634eb---tuxin.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/29dcdca59bdb313609bef8a3525697f5/79490941109.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/9c386031442eab507f75a70b1b3ac3b7/vijalin.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/47ad12bd0b11c7d88d17486e2e7a31e6/jubukekoveramudu.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/f95dfcdeaa16eb086fbcc90e179c1bae/saridowusaje.pdfIn PDF document text
    • http://noahsmarinesurveyors.ca/userfiles/file/mizebifenowod.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b97e1d70624---magimilin.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/kopupapibipaf.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070c76fe5c2c---pexovibovizivat.pdfIn PDF document text
    • https://swalaya.in/userfiles/file/44544889594.pdfIn PDF document text
    • http://sequoia60.com/clients/875776/File/fudadisuzugo.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/8k6h67alqolhogr86f6oooahdi/dawofasanukejonafowiwizu.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/7aa734774881e8edda67e3d04eb3f715/gugej.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/pidilerof.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/2bae45b51087660b5b7413f465125b7b/pugurobokajatane.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/darexafaponowogoseneduxaz.pdfIn PDF document text
    • https://qualitymattressfactory.com/admin/userfiles/file/zazajaxabolevarubewu.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/c601297ecc757871ab240f526094d5c4/2942111742.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160767db6d0079---zefagupaji.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/6937890216.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=how+to+hack+simcity+buildit+ios+2020PDF link annotation
    • 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_off0000f2b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2B1 11064 bytes
SHA-256: 52549de653161f4cb253641ddedd7acabf0062291b432a428b2bd79d21792035
font_01_sfnt_off00010c95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C95 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000124a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A7 18140 bytes
SHA-256: 5b78d4eb6790da14b97ac1a23ef0b0df66d4ba9798187eec88829d5ba928a004