Malicious PDF — malware analysis report

Static analysis result for SHA-256 efcc7cede73fb515…

MALICIOUS

PDF

80.0 KB Created: 2021-09-21 04:54:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d491d8ab1fff4de6aab411e69e775a25 SHA-1: 47a36a562c0828a848c4139e4b1e3a503a779fd9 SHA-256: efcc7cede73fb515be877943b6506ae903ce19061d297e0cf90d6cb7c46f53b6
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous heuristic firings indicating it is a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting. The ClamAV detection and ML classifier also flag this PDF as malicious. While no scripts were extracted, the sheer volume of suspicious links suggests the primary purpose is to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6259

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://queure.ru/uplcv?utm_term=how+to+download+emoji+on+samsung+keyboard PDF link annotation
    • http://omegapizza.net/uploads/files/32737946290.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16137e156716ab---rojixakufov.pdfIn PDF document text
    • https://valeaflorilor.ro/img/uploads/file/kubutirorutukepoxo.pdfIn PDF document text
    • http://orkoien.com/userfiles/files/8909368291.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/ap5g3bsvdbfsafaeslmhn6sv52/43917117476.pdfIn PDF document text
    • https://tonere.shop/app/webroot/files/userfiles/files/wijofutojujuwit.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/k7amdoof4mudg85egcckqlo55k/bosumojo.pdfIn PDF document text
    • http://fundacjahfg.pl/upload/file/vofumokawaxebe.pdfIn PDF document text
    • https://corcreation.twbiz.me/data/fckeditor/files/20210915_101220.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/xosoxu.pdfIn PDF document text
    • http://becskeicsodajo.hu/admin/fck_upload/file/76110308310.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210904055908.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/78939f4f7c89cca817215d50ff50ad14/rajig.pdfIn PDF document text
    • http://ngocphuocjsc.com/public/default/ckeditor/files/bigovemunupirilonexejif.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/f7cc33324a94309b91c70ebe1b9e4de5/pesaposetumepizaninukokim.pdfIn PDF document text
    • http://nollve.com/img/editor/image/file/5139703373.pdfIn PDF document text
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/52385798370.pdfIn PDF document text
    • http://fgsconsulta.com.br/ckfinder/uploads/userfiles/files/ritimutonifalujosa.pdfIn PDF document text
    • http://www.workbythai.com/admin/assets/images/welomalosawadatetawupi.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0a48b3bcb---vezegiponede.pdfIn PDF document text
    • http://njxinbell.com/upload/files/moledifadijalotikopese.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614200df59640---54319197231.pdfIn PDF document text
    • https://perkunasstudio.com/uploads/files/202109192243342246.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000faaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAAF 22776 bytes
SHA-256: 0a67acf24175267dcdcd27e2a07bb371c5d64686a8cd0739d118715c886f7c4d