Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c1d34e78dcc4f4f…

MALICIOUS

PDF

82.6 KB Created: 2021-09-13 19:22:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 62b3672c0b06bd703506b9b61055c883 SHA-1: 1e66930cad1f6a45eb1346ff56f292101fa806d3 SHA-256: 1c1d34e78dcc4f4f841d8f02b58aae4cb32e09ccfe78c802d5288af59fad27bd
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting a link farm designed to redirect users to potentially malicious content. The presence of multiple external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139e5bd4dcff---39520343492.pdf In PDF document text
    • http://floridare.ru/app/webroot/img/uploads/file/183403_61218627579.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f09671d99f---xinivoruwof.pdfIn PDF document text
    • https://creteotels.gr/FCKeditor/userimages/file/57129928569.pdfIn PDF document text
    • https://presentkompaniet.com/img/content/file/lefewowuzenajutesasufako.pdfIn PDF document text
    • https://chulintemple.org/CKEdit/upload/files/66163307265.pdfIn PDF document text
    • http://investgeorgia.ge/userfiles/file/sekirepodabusab.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/21139500893.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/e9f1cb781176792bdf668ffd6294c905/823690783.pdfIn PDF document text
    • http://gianniarnaudo.com/userfiles/files/lokuxebozidewikojebe.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///52722976429.pdfIn PDF document text
    • https://fivetc.net/uploads/files/70982465653.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612fd3567e1ad---83514441431.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/fa031537e0715ca4e6fcfae5a4134b1f/dosokaz.pdfIn PDF document text
    • http://bzws.zhanyougame.com/ckfinder/userfiles/files/86159699645.pdfIn PDF document text
    • http://gymostrov.eu/gymostrov/userfiles/file/10060170628.pdfIn PDF document text
    • http://mjengo.org/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/58153195056.pdfIn PDF document text
    • https://middletonchambers.com/ckfinder/userfiles/files/sivejunevaledigadadinelu.pdfIn PDF document text
    • https://0922.sproname.com/files/userfiles/files/54394621284.pdfIn PDF document text
    • http://www.zdravotechnika.com/ckfinder/userfiles/files/fufosomuvalejobupur.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/40746732281.pdfIn PDF document text
    • http://pes.edu.mn/ckfinder/userfiles/files/zokubuzizezuguko.pdfIn PDF document text
    • http://mediacast.vn/ckeditor/upload/files/83091552777.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fcccc6ae6b---gokomiwoxajedagekumi.pdfIn PDF document text
    • https://www.totspotdaynursery.co.uk/ckfinder/userfiles/files/78993907809.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=bleach+live+action+streamingPDF 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_off0000dee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEE7 17476 bytes
SHA-256: b4cf24cbb20010dd74ff5b19affc0f8590c04909d3a043f7fabb4928d100a55f
font_01_sfnt_off00010c57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C57 10796 bytes
SHA-256: ecffe04d41372df3f7cbd2ea8ac355a01236928ea2202b84c6ff857fcc3468d7
font_02_sfnt_off00012515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12515 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1