Malicious PDF — malware analysis report

Static analysis result for SHA-256 66f7fd1a7f92a92f…

MALICIOUS

PDF

90.9 KB Created: 2021-09-07 18:59:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6bee9b166964977445f7e17933f3f4c9 SHA-1: dbeddcf43d09d0c55f1cead780f578741c5df866 SHA-256: 66f7fd1a7f92a92f59693106435a7b81a113fa3e04594a4afe5cef0ab04a60cb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external URIs and links to compromised CMS uploads, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple links on disposable hosting and the use of UTM parameters further support a malicious link farm pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9906

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 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://wastran.ru/uplcv?utm_term=permanent+magnet+motor+plans+pdf PDF link annotation
    • https://nic-n-nate.com/files/files/kodezisoreworewizemojib.pdfIn PDF document text
    • http://wsystem.sk/userfiles/files/8565973550.pdfIn PDF document text
    • http://hibertek.com/image/files/20210623_085539.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/44627987114.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/ed3e6f7558c395c7cdec5c9366967378/semeba.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/tosapesoviwupofavonebara.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4abcc49ac3---2429271044.pdfIn PDF document text
    • https://podereilmontaleo.it/writable/public/userfiles/file/63654721818.pdfIn PDF document text
    • http://hasici-pristroje-eshop.cz/files/file/linixobujuwi.pdfIn PDF document text
    • http://hjtech.org/admin/upfile/file/gapaliv.pdfIn PDF document text
    • http://sonarkella.com/userfiles/file/12535854153.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/er0lj62a6g9be8cojd6mpm9tj3/wiwibizekavo.pdfIn PDF document text
    • http://depcip.com/app/views/panel/ckfinder/userfiles/files/9019654142.pdfIn PDF document text
    • http://pooq-design.com/app/webroot/fckfiles/file/35234220367.pdfIn PDF document text
    • http://sdds.be/userfiles/file/vaxiwajodare.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160754ba759d15---99324310394.pdfIn PDF document text
    • https://semut73.com/contents//files/9106133407.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079bcb0ae08e---koxodukemawozes.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094972ad9f34---duzovisal.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/tusawusugokebubutuxosisa.pdfIn PDF document text
    • https://asiabiru.com/contents//files/92364910832.pdfIn PDF document text
    • https://www.disbel.es//ckfinder/userfiles/files/81635301780.pdfIn PDF document text
    • http://hondatayho.vn/images/ckeditor/files/65052094522.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/sajedi.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/d6aa1503a2716aac7b663ff52eb17b94/noditumisopafeb.pdfIn PDF document text
    • http://didula.com/img/file/2157000061.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/0ab96cda21088183ba17721cacd10f10/85395145301.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000110dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110DC 10752 bytes
SHA-256: 51f80e405ed35699ba820db83027b7d3c3dccbfb7d1f6bb88251a3034a47d157
font_02_sfnt_off00012962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12962 20452 bytes
SHA-256: 050824accfbf0155967af40d2d99eb0ca0d865bae04a9d5bb7738dd455f75cff