Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bc8aef459a14c96…

MALICIOUS

PDF

78.1 KB Created: 2021-09-21 19:28:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 12d58afedc66643a74829537c709c9f0 SHA-1: 219208f63135860ed1fae51562b189161761498d SHA-256: 8bc8aef459a14c961143ec1bdeef1c222b23f3021218ee6454b0af3fe617a4fc
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or initiating malicious actions.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2980

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://batdongsandothanh.vn/luutru/files/rixududevewo.pdf In PDF document text
    • http://studiomarazzi.eu/userfiles/files/kigelon.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/muxedeluveniso.pdfIn PDF document text
    • http://go-pxl.com/uploads/files/54958306489.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136b6e6b9a71---84462114689.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/tupaderalabogomizeg.pdfIn PDF document text
    • https://grancom.by/upload/docs/86832395778.pdfIn PDF document text
    • https://yomadesign.com/userfiles/Proj_Name/files/pimarepewewededi.pdfIn PDF document text
    • https://snpwachq.com/files/js/ckfinder/userfiles/files/80679471669.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161335e75c6d55---26410527473.pdfIn PDF document text
    • http://lexus-custom.com/js/upload/files/bologulemi.pdfIn PDF document text
    • http://nikolabartakova.cz/files/file/82563192835.pdfIn PDF document text
    • http://maradonasalud.com.ar/ckeditor/ckfinder/userfiles/files/zudogi.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/161380033d2c69---nuwamililipimejafeze.pdfIn PDF document text
    • http://arisutour.com/ckupload/files/12887825760.pdfIn PDF document text
    • https://lanna-flyingclub.com/ckfinder/userfiles/files/4594012474.pdfIn PDF document text
    • http://www.huescalamagiaenfotos.com/userfiles/files/refufepi.pdfIn PDF document text
    • http://smwiarus.pl/ckfinder/userfiles/files/kuxoguwapitalutap.pdfIn PDF document text
    • https://aftaplan.com/works/peepsparty/html/upload_files/file/45673729386.pdfIn PDF document text
    • https://ckfinder.pamlskovnik.cz/ckfinder/userfiles/files/foxememofisik.pdfIn PDF document text
    • http://nazycakes.com/userfiles/file/5986334424.pdfIn PDF document text
    • http://unicaconsultoriarh.com/images/files/5523062787.pdfIn PDF document text
    • http://veterky.ru/ckfinder/userfiles/files/15965118709.pdfIn PDF document text
    • http://budaikepkeret.hu/uploads/file/vijexogufuwutorepelusale.pdfIn PDF document text
    • http://basse-normandie.annuaire-regional.com/ckfinder/userfiles/files/jegamiwiwel.pdfIn PDF document text
    • http://soles2walk.com/data/file/batile.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=anytune+android+alternativePDF link annotation
    • 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_off0000e3c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDB 20416 bytes
SHA-256: 621fdeb06fae0ee355291076e1e3a34eda8160bca2319e150cdabc767953d4d2