Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a26b5b1087ce4aa…

MALICIOUS

PDF

73.5 KB Created: 2021-09-02 06:19:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d586d06ae114f3f4979f643f2f8e7c0a SHA-1: 0bfbe8adfc3deeb80a027ae1d86f65a24affb251 SHA-256: 5a26b5b1087ce4aad6f164ab01e4fd71253ebeb68ae518722404da4483cd7f98
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm pointing to compromised CMS uploads. The embedded JavaScript likely facilitates the redirection to external URLs, which are part of a link farm hosted on various domains, suggesting an attempt to obscure the final destination and evade detection. The presence of multiple links to compromised WordPress upload directories further supports a malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/c9oqahp360ha2hia6dc3kre1qa/8109289346.pdf In PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/9ma87dknsgsgtji6f7kknir3n2/4621644868.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/povotilejonabejokik.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beb2016a233---wowepekekolisulokivenepib.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ae3a2490ad9---kupoziviripadomokopenefi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd18d46f8d1---49911192689.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/93495956015.pdfIn PDF document text
    • http://tunecharts.com/userfiles//file/kibewemo.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160c57fd9d7483---10906674078.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/7tq4pvf2hgapnvv733na0b9a1d/dolokimug.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ade6f956301---semawinolufaletuwajoko.pdfIn PDF document text
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/fusekotif.pdfIn PDF document text
    • http://whatdwellswithin.com/file/62098244289.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/19871383363.pdfIn PDF document text
    • http://absigorta.com/E/file/magidiwej.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607ea6c4743e9---35016838311.pdfIn PDF document text
    • https://agencement-menuiserie-var.fr/stockages/files/vumomakiwaxorupamanunuge.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/fafadonutuzela.pdfIn PDF document text
    • http://dtcguild.org/clients/80367/File/vareweku.pdfIn PDF document text
    • http://montex.pro/uploads/userfiles/file/72929982878.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16089011167b37---zimodolesanigutonu.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae6f057f606---belawadobo.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098c64a5a214---14702582939.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/bg547mffb1tam5o3j1pc25t5c9/60245844826.pdfIn PDF document text
    • http://skyrun-arser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210726030154424395irlndk.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160761c359ebef---pupaluxokavebid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=fat+alien+from+lilo+and+stitchPDF 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_off0000bdcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDCF 10716 bytes
SHA-256: 701d699d323f04d6de8223ff4f6cb8d5b7d56b7c38b1301992c17e5d9bc274cd
font_01_sfnt_off0000d62c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD62C 16420 bytes
SHA-256: b56d0f0c74542f41cc0707dc912ba44024a8f4f4427ca7f2aaac903e165583c5
font_02_sfnt_off00010019.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10019 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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