Malicious PDF — malware analysis report

Static analysis result for SHA-256 128b9fbbdd52a9fb…

MALICIOUS

PDF

83.1 KB Created: 2021-09-06 11:27:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5dd14989a77de9bcab2dd4b5c646e4ae SHA-1: a0292a894ca6fb87647030decc0a2e5cb3fe1719 SHA-256: 128b9fbbdd52a9fb5dc5e1ff6b266104a6863683dae68561cb04e8f542fa8a8a
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of numerous external URIs and the link farm structure are indicative of an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://hunting.kg/userfiles/file/36214427667.pdf In PDF document text
    • http://analogsys.com/uploaded/file/10675787606090d386a881e.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/wabakogetituver.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610348058915c---43602187228.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160965b37a6de9---jakenenipuzuxikitasa.pdfIn PDF document text
    • http://com123.vn/uploads/file/bijixe.pdfIn PDF document text
    • http://vinhthuan.com/upload/files/28701582797.pdfIn PDF document text
    • https://aventura-agence.lu/userfiles/files/rurejesab.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607416584f97f---47722756888.pdfIn PDF document text
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/wogufetukokanefami.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/e05152c4c630d94156c7312c69ffa567/78438451119.pdfIn PDF document text
    • http://densayhongngoai.com/uploads/userfiles/file/wuwovutovemejuk.pdfIn PDF document text
    • http://sabaispa.net/userfiles/file/98706883303.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/89861927360.pdfIn PDF document text
    • https://santa.sg/images/users/00000000/files/jaridixubulikosivir.pdfIn PDF document text
    • http://circuitvietnamcambodge.com/hinhanh/file/86641271362.pdfIn PDF document text
    • http://contentworks.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606d26bc62308---96670011461.pdfIn PDF document text
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e283faf953---75626469109.pdfIn PDF document text
    • http://ecandrychow.pl/Image/files/verigoludobux.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/085178721b8d5ba3c4d6dc24815d3fd4/wukoxor.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/3ca06a433f8df18d33d7dfb26058bb44/gojolovamujel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=cours+de+petrographie+sedimentaire+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_off0000d72b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD72B 22012 bytes
SHA-256: 38a9dca967c5cf5b0ec0dc96cf87edcd9a45e688baeeacda379e7297bb3c7d11
font_01_sfnt_off00010d16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D16 11032 bytes
SHA-256: d9b56978b089ac2682f30e26962a7d577367458a03050cf4a4d283091d030e33
font_02_sfnt_off00012669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12669 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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