Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dd65568aa740a93…

MALICIOUS

PDF

85.5 KB Created: 2021-09-01 06:09:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cffeed8ee6e65ce625ab8dafa9f6abe4 SHA-1: d3d11d9f03c3a5528be09aeade43d8ea43fb25af SHA-256: 3dd65568aa740a9345e1dfc3db42285d41d0566029512296b02b3f7b7ce54aaa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress installations. The primary purpose appears to be directing users to potentially harmful content or further malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608320c7a2bcb---9072705171.pdf In PDF document text
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8a143b239---lojarezitigir.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/160fbdf68583bf---pepenegakometi.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/aab96de02d9b4f49d07478b63d3828e4/simagilu.pdfIn PDF document text
    • https://sindonis.com/userfiles/file/bivumogu.pdfIn PDF document text
    • http://chapelguild.com/images/usr/82486414515.pdfIn PDF document text
    • https://alternativecarrepair.nl/userfiles/file/37276447306.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/16119f63230833---sojikibijogilowoludazagez.pdfIn PDF document text
    • https://wecareu.net/ckfinder/userfiles/files/85336501502.pdfIn PDF document text
    • http://xn--72c7caerxx0d3a9eve.com/UserFiles/File/baximomagopuzodugotutuk.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202106241200249221.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e682edbdb8---nisimirasavuziv.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/17643185110.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b26f522c0e6---surawov.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099011a7a41b---45754452640.pdfIn PDF document text
    • http://talk200.com/admin/admin/uploadfiles/file/tebisokotav.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/fgadvkjhjei6l748mf77vo4dko/58348499130.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4439d6245---tukaramepuvixuxejez.pdfIn PDF document text
    • https://nmcs.ca/userfiles/files/mejaxoru.pdfIn PDF document text
    • http://grandviewheightsalumni.com/clients/79364/File/fagasawop.pdfIn PDF document text
    • https://adasms.fr/userfiles/file/fanijugodufegupowetudep.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/bd1f562415ff55e05086b0bd659ef770/nokuxabanipigo.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160e51de7b74c1---wuwomixazunudoronu.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/5deefe55e4f6074d46ce274722f2d458/18645529521.pdfIn PDF document text
    • http://sirmamedia.com/ckfinder/userfiles/files/vonezefo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=icarly+and+lil+pumpPDF 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_off0000df87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f799.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF799 21964 bytes
SHA-256: 2b76599e15c4e2b50d21cab30497b54382f6da933cc9fee6993835e9dbbb2539
font_02_sfnt_off00013153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13153 10324 bytes
SHA-256: e8d167f16b2426a1a5c1c8e092fd664a56040c6d7525af6b9d18d0bd69bc2f38

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