Malicious PDF — malware analysis report

Static analysis result for SHA-256 923e35753698c642…

MALICIOUS

PDF

165.7 KB Created: 2021-08-09 03:13:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 834974f4ef3e405c1dfe461cee969abd SHA-1: 1f4a92ca376b6eb69d7f77ff4bbe50b5501a0856 SHA-256: 923e35753698c6427f03b935a8a56ca377fd116515a1eab8a2a523e36f40e2c2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The numerous embedded URLs, many pointing to compromised WordPress sites and using UTM parameters, suggest a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, indicating an attempt to hide its true purpose, which is likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://archism.ru/uplcv?utm_term=numerolog%C3%ADa+angelical+libro+pdf PDF link annotation
    • https://www.tyrtaios.gr/ckfinder/userfiles/files/83326198208.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/3562875921.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608968fc4842d---96779786911.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606e6f25bf3e4---44839930103.pdfIn PDF document text
    • http://kaithompson.com/userfiles/file/vudutok.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c46272d46c---vulikinemud.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6ed6c0b0c---fidodusikusupevev.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/1c9c0334a22cf0ccc9757e79f2e3f692/dudumoxe.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/27573298764.pdfIn PDF document text
    • http://pijntherapie.be/uploads/files/kumagumij.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/33138baae2501b67b4c74ba967aee043/pamadarubosiwatikedejapi.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d874e33513c---juzetij.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/rizanizavopowukotixo.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/84ca9863995decfd97a6bb59cc5e3839/texaperivezarefitutewox.pdfIn PDF document text
    • http://bacsiha.com/public/ckfinder/userfiles/files/loketosaberiwekaruvura.pdfIn PDF document text
    • http://primebrokeragetx.com/ckfinder/userfiles/files/37482282707.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/5fc7d13dfe0d79570179abebb108b9e5/ledam.pdfIn PDF document text
    • http://charivne.info/images/file/37750688631.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/c52a738c6d080188ee83f486ca2930aa/29941161409.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/79cfe1a4d7bb2677f797375eda42bab7/lejofagipudavejaxopatadu.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/160943e5b22065---zedajisi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000226f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x226F9 18452 bytes
SHA-256: 935c09f5ae67d08f2e7106ea00e462c6148790aa2729f3120895de2365d56ccc
font_01_sfnt_off000255d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x255D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00026ded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26DED 10976 bytes
SHA-256: 6b40137ec8ef8fdfa66b882cf5ccfda146e0084540af7160fbf3cbb3dac976fe

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