Malicious PDF — malware analysis report

Static analysis result for SHA-256 7369c803d556d0c0…

MALICIOUS

PDF

67.9 KB Created: 2021-09-04 02:51:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d113607f0d3a4b2165a48850b94355e1 SHA-1: 71999ea8872db19079f36f235dee9ce4b8896173 SHA-256: 7369c803d556d0c07424824e4438b752482baed1341dd6aa2a9cfbcc28c0cded
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites, likely serving as a distribution point for further malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests these links are on disposable hosting, intended to evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5668

Heuristics 5

  • 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.
  • 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://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/gr936grbejbg0b7a6gidu01do5/nomewojobisufexomi.pdf In PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b6c1787c8e---27680761785.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160c4193be8971---71184874492.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f855ff204b---varulidegupusitagekelu.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160757a5717f3a---jiwexovejalerar.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/bujolumekaza.pdfIn PDF document text
    • https://exporoaster.com/app/webroot/files/images/pages/files/pibixekiliguxuxafijuwoges.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072e2674737b---60893023756.pdfIn PDF document text
    • http://aviteksural.ru/admin/ckfinder/userfiles/files/20725323071.pdfIn PDF document text
    • http://hilltoplancers1975.com/clients/13753/File/zulagadidagobonexaxinif.pdfIn PDF document text
    • http://cascinamana.it/userfiles/file/gidebovuvodamuzugopamuse.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/tiuob63o9ijgn2uv68fq034hp4/xigunimikazi.pdfIn PDF document text
    • https://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/d083d1730ba69dc9b08c0f524d2ddd77/102165488.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/7ijajrkkq72p8pvmaujm7q3fv1/gagig.pdfIn PDF document text
    • https://tskrea.com/userfiles/file/6832679070.pdfIn PDF document text
    • https://aimtronu.org/userfiles/file/38512690039.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ec424b4b80c---xinezak.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608663eab78f0---80120060712.pdfIn PDF document text
    • https://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/21682334434.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/63485014419.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/523875da9daafac61481604bf7c51e86/negapaka.pdfIn PDF document text
    • http://vako.vn/app/webroot/uploads/files/91586467987.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=catalogo+contitech+pdfPDF 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_off0000dd82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD82 10664 bytes
SHA-256: d935557e35a75221a1ff37a437d46f3f28f1da2e94d2b2561a6a68808ef950e2
font_01_sfnt_off0000f5af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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