Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9f83884e768c567…

MALICIOUS

PDF

115.5 KB Created: 2021-08-06 15:52:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c6773a6012cce9daf8ca5e5d24c47666 SHA-1: 3305e4b028450cafa40f57a14fbd80e308141810 SHA-256: c9f83884e768c56752a87724437936b12c95b8ad85cf5489fb03ed86ef17f66a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farms indicates a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6626

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://pixomot.ru/uplcv?utm_term=kinematics+dynamics+and+design+of+machinery+3rd+edition+solution+pdf PDF link annotation
    • http://www.tobywells.org/media/fckdir/file/junoleweku.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cf38c6515a---15090643905.pdfIn PDF document text
    • http://dellalontra.it/userfiles/files/42807119527.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/bf7518553d5c3e38f33f63e60b1d5e53/jidezawolinijeku.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/d8gc2h78qhfvjqubti1kpk33oio3g0uh/31111365456.pdfIn PDF document text
    • http://hum-lucknow.org/test/fckeditor/file/vufipeso.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/905d21e8baf4f3ef77c9daa5bbb4e34e/duzinogemadeso.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b773a627494---64854822059.pdfIn PDF document text
    • https://aaaxxion.info/images/file/58966010996.pdfIn PDF document text
    • http://polipadel.com/userfiles/file/31276875870.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/jazerutakagipubelabixoz.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/dudemuzoseminog.pdfIn PDF document text
    • http://satisfytech.com/ck/upload/files/nelexusaxopono.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16085cbfca3ef4---38221146949.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d61dd592abb---lokivanapaviteni.pdfIn PDF document text
    • http://gesht.ru/admin/ckfinder/userfiles/files/65342044056.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/d13d0327ee34650e7ff3c880955cfa0a/15772276595.pdfIn PDF document text
    • https://www.colours-of.com/wp-content/plugins/super-forms/uploads/php/files/jov9d38v9iq3n1fpraainecr9u/fowowebadizofutibuwaxam.pdfIn PDF document text
    • https://efnnma.org/files/file/34735353328.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1607f027286a71---53917587483.pdfIn PDF document text
    • https://likeevent.it/writable/public/userfiles/file/sefomigor.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607942d3490a7---zanafulos.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/pep1goatkgqs68hnbulofo950u/48619951450.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bec12e9bc10---kimosesawofekewan.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/gawolazefebubujululiko.pdfIn PDF document text
    • 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_off00019fea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19FEA 11444 bytes
SHA-256: 1b7d4139d1358222b9603811b5df68e991fd078faa278a6225bc44885f345960
font_01_sfnt_off0001ba96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BA96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1