Malicious PDF — malware analysis report

Static analysis result for SHA-256 c55d2bbfbba51f56…

MALICIOUS

PDF

82.9 KB Created: 2021-09-03 19:50:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: fde664d1a41ce56ced1d67b4d15d7840 SHA-1: 67e8e8a6bc0488b544e9fe1babb9d4c441318cbc SHA-256: c55d2bbfbba51f5676458c1444b825dd4be71a8617e9df0c72dbabc165571302
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm to distribute further malicious content or phish users. The presence of external URIs and a link farm heuristic indicates the primary goal is to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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 http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085085643179---21897230330.pdf In PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071f2981957d---dobixuv.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/kebufotirolelolekezud.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/761339785.pdfIn PDF document text
    • http://ned.ru/uploads/files/50371416817.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/93003417584.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/movudufegaronedadawu.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/97085529242.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/8926ede1fc80b5fe288375b75530880b/56969358257.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160756f3900572---40290080661.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160926625d0c49---pinid.pdfPDF link annotation
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a8c6eea5b98---vupazujazegewopagixuzaru.pdfIn PDF document text
    • http://timelessmebel.ru/wp-content/plugins/super-forms/uploads/php/files/7328ab7e60b5e78826552c1ac15c5bba/winozonofoj.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/tdcj5rvr68ms3351oqsbps0vm2/sozuvubevaxub.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/51133789445.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/bc106c008d243cf95ba16c76f2d55ba9/bobolox.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fbef358d07a---24268726407.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/03bec7dcec26b09d93137805db3ba03a/tikozigi.pdfIn PDF document text
    • http://ccymgr.com/clients/a/ab/abc9983c1712fd324c9320bcfcf975a8/File/dupuwuvowisosivijulapuj.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/50261588376.pdfIn PDF document text
    • http://billsky.ee/files/file/jogemet.pdfIn PDF document text
    • https://schmitz.cz/res/file/61104712686.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=jordan+b+peterson+book+pdfPDF 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_off0000df0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f720.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF720 18348 bytes
SHA-256: d552215f0273b72723628d4a4ed128877a1ebd1f7748f3fc8befee969a64250a
font_02_sfnt_off00012628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12628 10576 bytes
SHA-256: 1376af7b66cd519a4e35905d22e53599defe701fd431c70203486dfa04f929d7

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