Malicious PDF — malware analysis report

Static analysis result for SHA-256 dedde11e43678751…

MALICIOUS

PDF

74.6 KB Created: 2021-08-06 22:50:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d8239e5be1ba1f08ff8271af2ca4c619 SHA-1: 1530bf048790ac5b8a6c22eb32991fc4b922c9b3 SHA-256: dedde11e4367875158f0c4e2b10382619ac113b41230b17d196b233f983bceae
124 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites. The ClamAV detection as 'Pdf.Phishing.Trojan' and the heuristic findings of 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' strongly indicate a phishing or malicious redirection attempt. The document body is heavily obfuscated and unreadable, suggesting it's not intended for direct user interaction but rather to host links.

Machine Learning

  • Nyx PDF Classifier clean score 0.2303

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 https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084fea7d47e4---91765594584.pdf In PDF document text
    • http://findmealocalpainter.com/insurazon/admin/userfiles/file/pasijujigepimuxu.pdfIn PDF document text
    • http://architettoannalisatinelli.it/userfiles/files/rirujebizo.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607096d362c08---zesom.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160df20a51ba0e---34691018092.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/79297972954.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bdf592cc4c---58783419976.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/56732531339.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/br7f7hio6oq73sc37imcvph7o2/xapilog.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/42858633857.pdfIn PDF document text
    • https://baobihungphu.com/media/ftp/file/40824735272.pdfIn PDF document text
    • http://50wj66.com/clients/a/af/af9d65f11c1965a5434adcd4cd578f00/File/34235803554.pdfIn PDF document text
    • http://hawks79.com/clients/85064/File/83498483253.pdfIn PDF document text
    • http://ohmamakitchen.com/uploads/files/viditegez.pdfIn PDF document text
    • https://hansenlight.com/UploadFile/files/peregarolur.pdfIn PDF document text
    • http://architettorobertafasola.eu/userfiles/files/27179435537.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/bifofavozutodobowazofakek.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/42507980938.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16084cbf5edfae---jomubatiparalulazizo.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a4826c1f973---vozoxetuzikofubinab.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce3cce9b69---pipozuvi.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/e949c6815634d9316e97d6dde113e45b/19402233460.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/defefoxusilizoxiwedanumo.pdfIn PDF document text
    • http://nuovojob.com/userfiles/files/80875962318.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f9d5820969c---tuwovatoxixivewut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=partituras+gratis+para+banda+pdfPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/50445bf75de0a154e54f090fb6aec104/29075157399.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_off0000f1eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010a02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A02 10616 bytes
SHA-256: cd499b5c963b3fcd2f6a7943c513047c5efe2c692f5871db1f2d6a31ae616fe4