Malicious PDF — malware analysis report

Static analysis result for SHA-256 b210225d545e0d57…

MALICIOUS

PDF

75.1 KB Created: 2021-07-16 02:48:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 88f118c810df069a5a020b98a2a9d332 SHA-1: 2fea6669129dc44f0f2f2e07196c46643781d651 SHA-256: b210225d545e0d57038f7c4019c890b9d47d80dc55de12b2936105cea2ca7210
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous external links, many pointing to compromised websites or disposable hosting, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier indicate malicious intent, likely for distributing further malware or phishing content. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document, potentially leveraging embedded JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7403

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://laborke.ru/uplcv?utm_term=class+11+chemistry+periodic+table+pdf PDF link annotation
    • http://bjhtdszdh.com/v15/Upload/file/20215202216279467.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/ed3e2b4373d00483ea1c14001d607662/36532761367.pdfIn PDF document text
    • https://hostmegasoft.com/calisma2/files/uploads/nugawisanarevekorafirut.pdfIn PDF document text
    • http://hf1968.com/clients/48820/File/fumovuzelafar.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160ace67a1602b---61014919270.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b03629c5c95---52664702154.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/bf96b7766b01955e150bdeab60f0181b/46690303004.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c958657c86f---petopemonidu.pdfIn PDF document text
    • https://zzarosiscarampola.it/file/gomekiteragekeke.pdfIn PDF document text
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/240906209614.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ba6ac5ec9e1---latabotipigelixutotaz.pdfIn PDF document text
    • http://20thhelicoptersquadronreunion.com/clients/71358/File/94341538480.pdfIn PDF document text
    • https://webupdate.ca/wp-content/plugins/super-forms/uploads/php/files/ec1v1r88cvabh4kmjf4o5j4i58/vevoweroxirugukiguruvogi.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16095a2f4cc2d8---89747991893.pdfIn PDF document text
    • https://campermagazine.tv/public/file/xotexukugamelen.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b788909e75---tavuvifasurowaresugagog.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160797b56f1cc5---84952708451.pdfIn PDF document text
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/3k9le27m84t1lntls3n9n4so6m/mewukitujezufil.pdfIn PDF document text
    • https://nabsangram.com/userfiles/file/74611226959.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/8dpfo248akfn5kqoc757omcub2/dadilutogo.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a06d35d43af---63714156320.pdfIn PDF document text
    • http://ural-kip.ru/admin/ckfinder/userfiles/files/zoxivinetizigexizoxakun.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d195abd2ed---41764601464.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/wixiwe.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_off0000f355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF355 11120 bytes
SHA-256: acb6f5efe43b2b2ed71a14cae92749d935161a98eef770846a7d32f052616e13