Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dc3e5c735536fb3…

MALICIOUS

PDF

94.0 KB Created: 2021-06-30 12:17:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c79d381a1718ca750b7e808dd4c92c4a SHA-1: ba2a4021f00d02ffc16cdd52a3eccc8c6ecd7fb7 SHA-256: 1dc3e5c735536fb3eccefedfb47fbd1e9de2d3ab16d8b32d8471386fe4632a56
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to external PDFs hosted on compromised CMS upload directories, suggesting a link farm designed to redirect users to potentially malicious content. The presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/4d57fe9ddac6d3bb26c25b1eb4e2a69a/8909704126.pdf In PDF document text
    • http://www.dereformasenalicante.com/archivos/files/jetifazuronugetamawo.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/16094435431ce4---kuxiloxevij.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/ns3383qalbafmg69mkvhaka480/79285368843.pdfIn PDF document text
    • https://cecprint.com/images/file/78730508741.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/add32f07b910f3af7f3865f0368c6900/20330536569.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/d3ed99debfb20dce2eefd88c4abc34dc/69875545009.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/zagizovadewiluxu.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/mizile.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2817deba0d---98008174171.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/83509630447.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16099145deb682---suvudetanigapoboboduvagej.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160840b3729f23---80248178354.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/xejuse.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/25801486551.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/4e97d953a1f6599dbad644c15803c7f3/rinukuwizuvuxubezamobomat.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/53121030365.pdfIn PDF document text
    • https://invest.pl/userfiles/file/losetoxipugefatibox.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160875344b1c06---29408107473.pdfIn PDF document text
    • https://finances-canada.com/wp-content/plugins/super-forms/uploads/php/files/31e15745ea71fd1df8186c4e7c292988/20574533351.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/runurinonekapigazaxak.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/26781929314.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/51998103965.pdfIn PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210629143317.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b02caf426ef---71274590127.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=centerpoint+sniper+370+reviewPDF 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_off00010c9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C9D 17496 bytes
SHA-256: 4fa773a2cd5f25cf6f2a59851fbc75c05c64dff100155f547979407bd530559e
font_01_sfnt_off00013a82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A82 10564 bytes
SHA-256: 7b6a6a7bd94cea10495781da7996f843e3d8e92cf8437b6af3c6ded127c06128
font_02_sfnt_off000152e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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