Malicious PDF — malware analysis report

Static analysis result for SHA-256 9670ec22847f0788…

MALICIOUS

PDF

70.0 KB Created: 2021-09-05 13:47:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 85da124dbcacd85c8ee79c572fc058cd SHA-1: a91edf18f2d0143da5da58709475dca487c41744 SHA-256: 9670ec22847f0788aec29422ac8d41a58ae994711acae57f09c230b915926db6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to obscure the true destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c337e20ae6d---49688068549.pdf In PDF document text
    • http://enjoy.sk/editor_uploads/system/files/kaxokud.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/pewiwajodukarof.pdfIn PDF document text
    • http://ballarioarchitetti.eu/userfiles/files/73334950777.pdfIn PDF document text
    • http://446888.top/userfiles/file/26232211364.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/bujitafuriwakiriw.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/powubemufogon.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/sewevojile.pdfIn PDF document text
    • http://studioingegneramato.com/userfiles/files/16135179771.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f03ca2048a4---78335824054.pdfIn PDF document text
    • http://pomodorolennep.de/gfx/userfiles/files/jeperizalobinigiposib.pdfIn PDF document text
    • https://karatenarrewarren.com.au/ckfinder/userfiles/files/fibatevo.pdfIn PDF document text
    • http://vivo-mebel.ru/upload/file/16382798996.pdfIn PDF document text
    • https://www.nlg.com.np/assets/ckfinder/userfiles/files/rutekemipo.pdfIn PDF document text
    • https://dnsbp.com/all4help/fckuserfiles/file/bewowolovetakizosupe.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a86f8a72ea---movib.pdfIn PDF document text
    • http://dogninja.com/userfiles/files/podemonomitaguz.pdfIn PDF document text
    • http://rotarybrescello.it/userfiles/files/lagelerititafifid.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608c92c794910---wurexufunanexuvat.pdfIn PDF document text
    • https://northcoteplaza.com/userfiles/file/dodup.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/11717030060.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/f4f3a5fd87e8b22501dbf28aa00b0701/sinowulug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=bmp+to+pdf+converter+onlinePDF link annotation
    • 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_off0000b3b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3B6 15108 bytes
SHA-256: 74ad43609501a7076afd21158fc19f6b10a455664f87215bc8fd6de820833207
font_01_sfnt_off0000da33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA33 10572 bytes
SHA-256: b6c824c1675faee63d2ef86706c70b666ab932ca23b764b9c6e279437f14a6f7
font_02_sfnt_off0000f24d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1