Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4a57fe43115d1c2…

MALICIOUS

PDF

65.1 KB Created: 2021-09-18 12:14:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3f23224dae6eb0060f52bf6ded69a3a1 SHA-1: b98378b7826389a68261f0ac6dfefc92feea6799 SHA-256: a4a57fe43115d1c2f1adc2ce1d633036161e7bdb5a7b07ddb2e569c3a1b8a946
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document containing embedded JavaScript and a large number of external links. The ClamAV detection and the heuristics for link farms on disposable hosting and compromised CMS uploads indicate a phishing or malware distribution attempt. The embedded JavaScript likely facilitates the redirection to malicious sites or the download of further payloads.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3605

Heuristics 6

  • 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
  • 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://philabc.ru/uplcv?utm_term=gta+san+andreas+pc+release+date
    • https://samudra99.com/contents/files/pubumenanefivof.pdf
    • http://bud-med.eu/userfiles/file/zebekuranekoxovolawonujov.pdf
    • http://nmways.com/uploads/fckupload/file/xezujowodubujasabulakorav.pdf
    • https://tocgia247.com/wp-content/plugins/super-forms/uploads/php/files/dk370qm0sq8ik24tnj2c7t9rm8/mipexirazezurofe.pdf
    • http://maristaslardero.es/userfiles/file/jowikekewuwejejuvolupazo.pdf
    • https://samsungvrvklima.com/upload/ckfinder/files/34707808389.pdf
    • https://ost-fogging.com/upload/files/11818248743.pdf
    • http://millionsdiscount.com/mo_images/files/tateji.pdf
    • http://poltinka.ru/userfiles/file/patiwe.pdf
    • http://lacasedescaraibes.fr/file/napefabizugilasigasu.pdf
    • https://beaszemin.com/files/fimuneromepedunifiv.pdf
    • http://ourconn.com/userfiles/file/202109012141452181.pdf
    • http://sweepinstyle.com/userfiles/file/46292996686.pdf
    • https://chmelo.hu/sites/default/files/file/58418140901.pdf
    • http://jungam21.com/upfiles/file/1630509267.pdf
    • http://ipllaser.in/uploads/66989882893.pdf
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16131ad1add4c9---nimonipewolasu.pdf
    • http://klick-tipp.at/ckfinder/userfiles/publics/files/dofekubagerikatagu.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/161426de536792---jimisivepafomevowolifuz.pdf
    • http://ferrocom-spb.ru/userfiles/files/xawevogubalav.pdf
    • https://12shio2.com/contents/files/rexozeginef.pdf
    • http://tanabuauto.com/js/upload/files/wegutasafanodiwato.pdf
    • http://jsushibrea.com/uploads/files/90313220266.pdf
    • http://tokyosushilohaus.com/uploads/files/fejajubosikoxowuso.pdf
    • http://bobiniauto.com/userfiles/file/65460472124.pdf
    • http://gestioniarmatoriali.it/xeferegetob.pdf
    • http://www.beautyvogue.ch/Files/file/50490789732.pdf

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