Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f3fcd4f123dd2a8…

MALICIOUS

PDF

85.5 KB Created: 2021-09-18 04:24:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1b8f8c984623478f443b871a135d0e19 SHA-1: 58a1e3557678009c29073f4b405b95ab628b5090 SHA-256: 6f3fcd4f123dd2a8cd7445a5730b4bc269355ea5622e08dfb1de60e4c58b7441
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://drafthe.ru/uplcv?utm_term=game+idle+offline PDF link annotation
    • http://k1a.ru/images/files/file/86414282484.pdfIn PDF document text
    • https://palezieux.com/ckfinder/userfiles/files/92513736935.pdfIn PDF document text
    • http://awfiowv.love-mrt.com/upload/files/bomijezotuwazetefuba.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16131651984481---56170882143.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/14360a93cd7df94f1732763d6d588e32/lizex.pdfIn PDF document text
    • http://vector-mebel.ru/uploads/files/wilixigasixikawe.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cab5c3f60c---35100345709.pdfIn PDF document text
    • http://mecateengenharia.com.br/ckfinder/userfiles/files/mibebanexewawesetagu.pdfIn PDF document text
    • https://myclubowners.com/userfiles/files/zirifas.pdfIn PDF document text
    • https://aventura-agence.lu/userfiles/files/dezokufarosar.pdfIn PDF document text
    • https://doctornhospital.com/banglanews24/editorsfiles/files/dawolowadirerufibumu.pdfIn PDF document text
    • https://alajuusa.ee/media/contents/file/64470454840.pdfIn PDF document text
    • https://elminhaj.org/userfiles/file/91471583692.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613452e9169db---sinuloxaf.pdfIn PDF document text
    • http://soskuwait.com/outscapes/admin/ckeditor/uploads/ck/files/kitezovip.pdfIn PDF document text
    • https://webmedcentralplus.com/userfiles/file/94604550504.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/94283910973.pdfIn PDF document text
    • http://miskolciharsona.hu/pictures/file/40106526343.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/99kck0h96q3fh2t6gd09n2n9br/9149274234.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210911_6ACEC8B1F9060DB0.pdfIn PDF document text
    • http://pegastelco.com/pictures/files/zinutokiwodovezodam.pdfIn PDF document text
    • http://www.synagoge-stommeln.de/ckfinder/userfiles/files/xubusowazifuzibivegov.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_off0000ed84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001059b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059B 10188 bytes
SHA-256: 45072ffb4535b020f1d12fff32fca22897b37d54fa94b340ecd493b049486917
font_02_sfnt_off00011c50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C50 17168 bytes
SHA-256: 7504cb0a6bc63cc98fcb62e289cbf0560dbc0ba21e6a867d9f9fe72a900eea11