Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bcb21723f6d8d24…

MALICIOUS

PDF

72.3 KB Created: 2021-09-05 00:33:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 4341d3d7103e9a5d11f7a14a8c06ba73 SHA-1: b6434c8ee48e6b756920696fe1b3c0049fbfd7e4 SHA-256: 5bcb21723f6d8d244a62d1e669e1991f518e75ff533c53c760a8fc15b7344c99
154 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection as 'Pdf.Phishing.Trojan' and the ML classifier's flagging further support its malicious nature. The primary goal appears to be directing users to potentially malicious external sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5715

Heuristics 5

  • 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.
  • 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 http://abwingssuffolk1.com/uploads/files/32784957814.pdf In PDF document text
    • http://aelma.com/sites/default/userfiles/file/27058687911.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/160d61d6130dfa---66670073685.pdfIn PDF document text
    • https://ip-kamera-rendszer.nuttydog.hu/ckfinder/userfiles/files/jomevojirajapemadasos.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/7f99943ea9ebfbb56974ab62019a5a9f/63223996301.pdfIn PDF document text
    • http://teacherandtraining.com/coj_u/KK/userfiles/files/74537921501.pdfIn PDF document text
    • http://kingalbertltd.com/uploadedfiles/file/77241522646.pdfIn PDF document text
    • http://xn--66-6kc8bfmkmjd.xn--p1ai/admin/ckfinder/userfiles/files/24021801633.pdfIn PDF document text
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/48qts6sl7pmh4fo9qrce2u2slm/78954045416.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16105dfa7492a1---tuwejavi.pdfIn PDF document text
    • https://greenline.bg/userfiles/file/givadi.pdfIn PDF document text
    • http://cloverpark1961.com/clients/6/6a/6a73a08bb68f643008adb5efbbb44e43/File/41195360384.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/gnn6rg56plrrgih8kc17br6up1/lifurixusobudutoziduw.pdfIn PDF document text
    • https://jagamimpi.org/contents//files/wimogipulasonuvurojipa.pdfIn PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/fugupim.pdfIn PDF document text
    • http://autoscuolavalerio.it/userfiles/files/xokasezosejemaju.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2dc69cfa8---8812614016.pdfIn PDF document text
    • http://ylpqzl.com/ckfinder/userfiles/files/34352491533.pdfIn PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/37622752820.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/ponuxipijenifabotalemujo.pdfIn PDF document text
    • http://honghuibio.com/d/files/76124364051.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1610ae33d2f6c7---5766617746.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/15946317562.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098142dda26b---40369097260.pdfIn PDF document text
    • http://wronba.com/uploads/wysiwyg/file/42375238613.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=convertir+de+word+a+pdf+gratisPDF 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_off0000c767.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC767 16924 bytes
SHA-256: cd591af9cb17443cee83933ace7c9e9638b82f56149ad7ea1d84e37715faaa63
font_01_sfnt_off0000f226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF226 10808 bytes
SHA-256: f3b793fc85d8789f9bb50692520efb9d3fe085249c6fe867bc51348991268802
font_02_sfnt_off00010b20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1