Malicious PDF — malware analysis report

Static analysis result for SHA-256 0555f805d8ce15a3…

MALICIOUS

PDF

78.9 KB Created: 2021-09-04 18:58:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b75ea1a78f35ca1a3321bfd9a2b80975 SHA-1: c185b75d3c1a2e5797830c070a81cb5333e3066b SHA-256: 0555f805d8ce15a30d83dbf56675fa54c0dad9dcffb4d1d3f37460b937f2ab2b
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript, which is often used to redirect users to malicious websites. The heuristics indicate a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute phishing content or malware. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5727

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://medvor.ru/uplcv?utm_term=sinhala+songs+keyboard+chords+pdf PDF link annotation
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160ac900e5e039---fivojuvag.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/vusijuwarim.pdfIn PDF document text
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/36379484797.pdfIn PDF document text
    • http://imailbox.nl/images/uploadedimages/file/86061892335.pdfIn PDF document text
    • http://euro520.net/userfiles/file/1627635447608572279.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102cd7ed2975---55834062795.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942cf683039---963805822.pdfIn PDF document text
    • http://skisun.it/userfiles/files/31018337245.pdfIn PDF document text
    • https://fallahi-sch.com/userfiles/file/zameje.pdfIn PDF document text
    • https://elbag.net/wp-content/plugins/super-forms/uploads/php/files/87e34696d960cfd7314b22625767fcdf/16511845906.pdfIn PDF document text
    • https://wholisticvibrations.com/wp-content/plugins/super-forms/uploads/php/files/53aad073ebecff6d3e3f22be61620923/xirudegina.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/16124a7ef49c25---73085596352.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/57382846512.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607abd3d12720---lexoresagodemawezaneg.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/6684255626.pdfIn PDF document text
    • https://namlongadc.vn/uploads/news/files/28744264216.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/21ae788effbcaa62c171351aa1fc3249/13547641510.pdfIn PDF document text
    • https://chachachat.info/js/ckfinder/userfiles/files/68693140342.pdfIn PDF document text
    • http://www.onlinetemsilci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b056ea7421---gugekow.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/gogidajamopofemetawetobok.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec8df8c632---xuvupovekunuge.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160eca671534c8---ferematisu.pdfIn PDF document text
    • http://psystems.gr/Administrator/uploads/userpics/OutPostImages/files/51730806043.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160743978ce012---54116297631.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/bivomom.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/nusogowu.pdfIn PDF document text
    • http://lovewhereyoulv.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/873f579024b9c514337bdf8c702acb92/xufokulogumenufavazofole.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_off0000df79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF79 11224 bytes
SHA-256: 4ab27c552fad003b9d6b04bcc5db32de41fefda187a2c1b11b114748ad0ca53f
font_01_sfnt_off0000f932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF932 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11144 18156 bytes
SHA-256: 2b0312bae5e9737d9c77b318ee1528c37f1578b01a00645486e99019eef656bd

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