Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fcf31c84315decd…

MALICIOUS

PDF

69.3 KB Created: 2021-09-07 21:06:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 411ac0ba1863d8e16c246d416ed8bfef SHA-1: f36f6ce64ae10a90327de6a0f7dac0a54300ce41 SHA-256: 6fcf31c84315decde55e5f5ea035888d52c6c6c225cf1f6cfec65a008aaf1deb
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload directories or are part of a link farm on disposable hosting. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a malicious intent, likely to phish credentials or deliver a secondary payload via the redirected links.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4862

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://philabc.ru/uplcv?utm_term=kegunaan+worksheet+dalam+akuntansi PDF link annotation
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/44f021b2e5ebfcc516d32a511823dd6e/pesodajezejirax.pdfIn PDF document text
    • https://dolaodong.com/userfiles/file/boxigosexalo.pdfIn PDF document text
    • http://turnwealthy.com/ckfinder/userfiles/files/voliduvatazerimatuxo.pdfIn PDF document text
    • http://www.ks-zahnarztpraxis.de/upload/files/70433433682.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afcacb0cd74---91638483066.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/puwenazeka.pdfIn PDF document text
    • https://karolinanowak.com/userfiles/file/tatugamilotimajir.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/56006370438.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/v33k3r4kitvkfkqhk9jgkdech6/30980082034.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f3733ec5f---lizedekinimikaz.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607186fef1d83---molarexogogerebu.pdfIn PDF document text
    • http://sfera-vlad.ru/img/file/roniwobasofusujupix.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/34511927898.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608118d2d1fc5---jupotivikoforag.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ea4962722---sipogadipowaput.pdfIn PDF document text
    • http://karpatskiles.ru/store/file/47197277404.pdfIn PDF document text
    • http://volvo-cars.jp/js/upload/files/xegap.pdfIn PDF document text
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/92480316567.pdfIn PDF document text
    • http://chinazzjx.com/d/files/82600761402.pdfIn PDF document text
    • http://1night2day.com/ckupload/files/defebejalovibisonifexat.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/dfcdc185f257e5f1168a3ed41e403c3e/54577302709.pdfIn PDF document text
    • https://cafesca.info/ckfinder/userfiles/files/25861250114.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/a3605f5602d25eafd2c613d9e44df3b1/felebatukox.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fusalixofaf.pdfIn PDF document text
    • http://apartamentykunickiego.pl/architekci/public/upload/ckfinder/userfiles/files/83546393064.pdfIn 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_off0000be7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE7D 15804 bytes
SHA-256: 8e509792a1f7920f20c533b2856ba65c69fe43c686bfb90e6403113d547d9a6f
font_01_sfnt_off0000e6b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC9 10964 bytes
SHA-256: 0a6b80bbf897ff00b7b790586846d11fcabe9fb2c18606dad811dbed7b1c826b