Malicious PDF — malware analysis report

Static analysis result for SHA-256 e017082c9c830dcb…

MALICIOUS

PDF

71.6 KB Created: 2021-09-08 06:49:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a73068455bc7a7860f57cc8b0ee563a1 SHA-1: 4f305042dee5e760f605b7e33870a8fa129f1107 SHA-256: e017082c9c830dcbf5b2ac869be943ede09b1405ee195d8d65f99c571481f902
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous external URLs are embedded within the PDF, suggesting it functions as a link farm to distribute phishing content or further malware. The presence of PDF-specific heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' reinforces the attack pattern of using compromised or disposable hosting for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6691

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://queure.ru/uplcv?utm_term=nom+004+expediente+clinico+2018+pdf PDF link annotation
    • https://galedo.cz/www/data/cms_files/files/busejolewigovekewurosorok.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9879d390b1---dadasin.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/27993704461.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/mueks9fp2ttmr0pgptm40gmrfs/xufuduvanopuf.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/saxujaxinoluwosad.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/todezidun.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/torakusubekev.pdfIn PDF document text
    • http://divapharma.com/uploaded/file/48813237735.pdfIn PDF document text
    • http://khunghinhdepphuctin.com/media/ftp/file/94152732233.pdfIn PDF document text
    • https://goodline.by/userfiles/file/xewanipikezeloline.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a445e830ced---vifutedofunidimumutuv.pdfIn PDF document text
    • http://quiltingacademy.net/fckeditor/userfiles/file/womesem.pdfIn PDF document text
    • http://innospectrum.eu/hirlevel/file/2360237706.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/51404983610.pdfIn PDF document text
    • http://halaljones.com/uploads/files/fenifabanopox.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/9d285d92491549f94376b07708338b45/7481623480.pdfIn PDF document text
    • http://hkalc.com/userfiles/buvigufedurabe.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a03777dc526---pewalavew.pdfIn PDF document text
    • https://lalicorne-hotel.com/userfiles/file/30152470823.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/38600d3b9f89a3bba347bcc6018a6ef8/91751737076.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160c16fc0571ad---sixoniserilimakabuzazi.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/8658962764.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/91011705879.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_off0000df4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF4D 19648 bytes
SHA-256: 0472ce6792c9e6867fba3ea873c8805186d7e75a5e720f82f6c16a7e7fd8c1d4

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