Malicious PDF — malware analysis report

Static analysis result for SHA-256 689c72d1616615f2…

MALICIOUS

PDF

163.3 KB Created: 2021-08-15 23:07:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: b1f9d25d3ddc52afa76caebaaf67bd9b SHA-1: 6e220a4eefdf39482df3ffdecf571fea6916f67e SHA-256: 689c72d1616615f2d8e9bb172dc2c00f82b328795162bd55657022eedf71a2ca
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9571

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/4832d41339ef1bbb716f456439cd929a/46048659378.pdf In PDF document text
    • http://syuncyoku.jp/upload/file/derelar.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/6b68c4b663bd7fbd89638cb68ebf32cc/48251502524.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a68ee2f2567---vuruxuwitadudepar.pdfIn PDF document text
    • http://s8radziejowice-paszkow.pl/userfiles/file/11732801312.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160746ff62b42b---pinekewajur.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/15291199611.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/b805c2e1be70472a3142ca9bbcb2c805/pefuxepulepivose.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/fi3816tei6lkftm7sdddgsrus8/xawaverawag.pdfIn PDF document text
    • https://tw-itemaos.com/ckfinder/userfiles/files/47445045502.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/33474017055.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/kagapetodariratifajowadu.pdfIn PDF document text
    • http://project-st.ru/userfiles/file/36324001477.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/af60a4d9faf443c3b775ff0696036a2a/73929752818.pdfIn PDF document text
    • http://sincaremedicaltour.com/js/upload/vuredon.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7a7f3a8e1c---96630540071.pdfIn PDF document text
    • http://kiiga.ru/userfiles/file/30895900777.pdfIn PDF document text
    • http://nakakinpump.kr/fckeditor/upload/file/nunoze.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/dbd84e25b76108ec5009124d414d13c9/32099695208.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b96fc6ba62---sujoxuxejosojupenikozoj.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084310f75870---57614587727.pdfIn PDF document text
    • https://malashealthcare.com/userfiles/files/77271176918.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=emmanuel+amos+eni+ministriesPDF link annotation
    • http://zs.tom.ru/jsplugins/ckfinder/userfiles/files/56935895096.pdfIn PDF document text
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00020b90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20B90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000223a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x223A7 10352 bytes
SHA-256: eb6871111f886ec9c2350b9cdba39f9eaa0d36be51f90dce7ac1819eecb7c4d8
font_02_sfnt_off00023af6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23AF6 1988 bytes
SHA-256: 6b2f43824ad5fa079027f6124f3a4ec13044ba9b23b509f2df3d09a54c1bd94f
font_03_sfnt_off00024416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24416 23164 bytes
SHA-256: 1bbb2380b1c426f850c62ab1dd54ae6f65a4df5138d332d36a2fe1dc4a05d34e

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