Malicious PDF — malware analysis report

Static analysis result for SHA-256 4190357971fe0418…

MALICIOUS

PDF

78.0 KB Created: 2021-09-04 10:49:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d2755fdaebb14b3b272295560c329112 SHA-1: 8c67ac5b6dbbbcf35ac86817aacfe0f216c14c5e SHA-256: 4190357971fe041884b44ac937c4e889b11bd07236be94a6889723f285c7e676
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm with numerous URLs hosted on compromised WordPress sites and disposable domains, suggesting an attempt to distribute malicious content or phish users. The presence of external URIs and the overall structure indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://nomylo.ru/uplcv?utm_term=amazfit+bip+manual+espa%C3%B1ol
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160963c13da40c---wukiludejoki.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160838a42a8033---48548386012.pdf
    • http://bertoniamministrazione.it/bertoni/public/file/68492921855.pdf
    • http://limobebe.com/userfiles/files/sulimatisevu.pdf
    • http://myafmc.com/clients/a/a5/a51d49d85de18111a3d718c63a5e5081/File/90843115885.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/05d5fd7c4b674f7ec1e43d549e2bc9f8/tibefobatibemij.pdf
    • http://citra.cl/userfiles/file/42111040801.pdf
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/sb53ucrdgfstkpo77ojm9l2nhd/4380123333.pdf
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/72t941q1pqkd5674j6r6bk8fg1/sikaviju.pdf
    • https://ldcpc.com/ckfinder/userfiles/files/73588035865.pdf
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/b93a775cb88cddd507c53915f86a5904/juxigumidolawefel.pdf
    • http://domholidays.com/userfiles/file/figiwamufatad.pdf
    • https://actioncoach.com.my/wp-content/plugins/formcraft/file-upload/server/content/files/160ed417f5ac6d---48017751575.pdf
    • http://gymlesgeants.com/upload/editor/file/xekupasuvudiriw.pdf
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ecabbc15a85---xokerisuxinafukujixebuxos.pdf
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/71659323071.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/e4cf9a3418df9071bf088646b9c35e46/wakozew.pdf
    • http://jrmhandling.nl/upload/file/remelaxu.pdf
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160723b31b896c---40396440059.pdf
    • http://unicaconsultoriarh.com/images/files/tisozexes.pdf
    • http://endustriyelkiralama.com/wp-content/plugins/super-forms/uploads/php/files/mk7kce6cj8fo40g86pc3cnsk8n/88983603878.pdf
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/16110ee7826217---22791804981.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd42.bin
2ec8800a4a052109bfb0c5f1b807c1eed9b02622706c04af70f6658acc424708
pdf-font-stream PDF embedded font (sfnt) at offset 0xCD42 10908 bytes
font_01_sfnt_off0000e615.bin
e34d8326ea6590768dcc8e55fe26e66b0eeca1781ec10736dbb1c7dbfc12ed33
pdf-font-stream PDF embedded font (sfnt) at offset 0xE615 16440 bytes
font_02_sfnt_off00011061.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11061 16792 bytes