Malicious PDF — malware analysis report

Static analysis result for SHA-256 29b52b0641515db7…

MALICIOUS

PDF

68.1 KB Created: 2021-09-22 21:28:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d1bec08c2205b54f07595d7acea8a7da SHA-1: 1bd092971171999fb2e877f3cf6816e92804c0f0 SHA-256: 29b52b0641515db790baf6130ce55647fbedc5a0feb8099e3e1dab0e527b217f
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting. The primary lure appears to be a fake WhatsApp Business app download, indicated by the 'utm_term' parameter in one of the URLs. The embedded JavaScript likely facilitates the exploitation of PDF vulnerabilities to execute a malicious payload, leading to the download of further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5668

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://crewmak.ru/uplcv?utm_term=whatsapp+business+app+download+install PDF link annotation
    • http://watch62.ru/files/files/mubanapuxagexefaxiw.pdfIn PDF document text
    • https://12tiga.com/contents/files/sunujobi.pdfIn PDF document text
    • http://www.casasemio.com.br/ckfinder/userfiles/files/petunokunata.pdfIn PDF document text
    • http://rem-proekt.com/f/file/xopomeralusavubig.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/dff1227c71c660bbda99e3041555a56d/94475797625.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/36651678371.pdfIn PDF document text
    • http://lilipoupoli-drama.gr/lilipoupoli/js/ckfinder/userfiles/files/85532419993.pdfIn PDF document text
    • http://vietsonplastic.com/uploads/userfiles/file/33804889290.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef971399c6---13421299630.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16137527e1d475---jurusava.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/69180456183.pdfIn PDF document text
    • http://madiran-cruduparadis.fr/ckfinder/userfiles/files/sidafuxubuwolexununug.pdfIn PDF document text
    • http://stroyvodservice.ru/upload/File/jafibivekubovikegose.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/298caaa1e9d211b673fcd8b2a6d7de2b/kizodoxikubotu.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files/bulidafaziwavuralige.pdfIn PDF document text
    • https://bharatbiodiesel.com/userfiles/file/xuruzakupenafuxewedewuwi.pdfIn PDF document text
    • https://dukeofmarshall.com/ckfinder/userfiles/files/89590721031.pdfIn PDF document text
    • https://mallncart.com/userfiles/files/vekamijexizasi.pdfIn PDF document text
    • http://normel.org/files/upload/file/merirud.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/sk5m2h4bhjob8b8lossavtld99/51508079719.pdfIn PDF document text
    • https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/pojejis.pdfIn PDF document text
    • https://smartech.lv/sites/smartech/uploads/documents/files/nexemetefagedim.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C5 10708 bytes
SHA-256: 2cb1574feafdc4993f59faf58bfc5bf8064683b3fa01829523fe347fdff7fe80