Malicious PDF — malware analysis report

Static analysis result for SHA-256 da2ad725c319bbe8…

MALICIOUS

PDF

112.0 KB Created: 2021-08-16 11:02:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bcec3067afd739f413aac9484ff18b17 SHA-1: 9ed0b2583f00ad32a57fbae71f0f8210370bf064 SHA-256: da2ad725c319bbe8dc834174a7018bd6c9438956b450bd237ebb0f277296980e
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The critical ClamAV detection and the presence of embedded JavaScript indicate malicious intent. The PDF also functions as a link farm, directing users to multiple compromised websites and disposable hosting, likely to distribute phishing content or download further malware. The embedded JavaScript is likely responsible for initiating the redirection or payload execution.

Machine Learning

  • Nyx PDF Classifier clean score 0.1143

Heuristics 6

  • 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
  • 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://nirvanaegitimpaket.com/calisma2/files/uploads/94782300014.pdf In PDF document text
    • http://mundori.com/js/ckfinder/userfiles/files/riduwisupivaredoniwa.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16095790155c93---laxiponilatufo.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ca0ea4d3435---pomuvidofikeni.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b2af26d3609---60689900531.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c903b343838---napudexafupotir.pdfIn PDF document text
    • https://asiajitu.com/contents//files/72426834478.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/a5c157a338879d346ed0d1f37e01717a/pafozejofuwada.pdfIn PDF document text
    • https://phuketwebstudio.com/ckfinder/userfiles/files/73411025394.pdfIn PDF document text
    • http://drjoecarver.com/clients/49355/File/gewefekabokorulosebutok.pdfIn PDF document text
    • http://mikailang.net/userfiles/file/20210620202507_1354876305.pdfIn PDF document text
    • https://sharenkon.com/files/78580507928.pdfIn PDF document text
    • https://bulgariapools.com/contents//files/fofavesoropajidetiger.pdfIn PDF document text
    • http://fazekaskozpont.hu/images/upload/file/85206343628.pdfIn PDF document text
    • http://eaas-journal.org/survey/userfiles/files/39245536797.pdfIn PDF document text
    • http://cmtsport.com/pliki/62797927643.pdfIn PDF document text
    • http://les-dvorik.ru/userfiles/file/meboni.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8723ee97f8---80360831966.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16098503e4e9bb---66380667111.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/josotosof.pdfIn PDF document text
    • http://pcwenhua.com/uploadimg/file/16229683962006303076.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210703150025267.pdfIn PDF document text
    • https://dietmoitangoc68.com/upload/files/16358857238.pdfIn PDF document text
    • http://ccspatti.org/userfiles/file/putebawusemapovazagawuj.pdfIn PDF document text
    • https://fertilizerproductionprocess.com/d/files/koworomepugufoxiwewukipov.pdfIn PDF document text
    • http://roycraft.ca/userfiles/file/23594653575.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=partition+gratuite+pour+piano+de+la+valse+d%27am%C3%A9lie+poulainPDF 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_off000153ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153EC 20724 bytes
SHA-256: f931bfcd935d447146b1d275c654148c5868a962ff1031b134cf4147f137c37f
font_01_sfnt_off000188e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x188E8 11092 bytes
SHA-256: 471f1d1aa41f8e74b296ca49090379252536f39c371c7f4daf39822c2b1964f0
font_02_sfnt_off0001a252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A252 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1