Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea5a7c96d58c0077…

MALICIOUS

PDF

78.0 KB Created: 2021-08-02 20:10:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f17ae5475cc8b65c449eed4fc9bd8d8a SHA-1: 284f13b8f3fbd6149c6cc53daa608cde55c911ed SHA-256: ea5a7c96d58c007706929ed5f4ba99d385e429e20e1579b0d9c6d21befa92aa0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous embedded URLs that point to compromised websites and potentially malicious content. The presence of multiple external URIs and link farm heuristics suggests an attempt to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://cructi.ru/uplcv?utm_term=netted+ground+sheet+for+sale+cape+town PDF link annotation
    • https://circolodelpistone.ch/userfiles/file/nufawimegomuseserini.pdfIn PDF document text
    • http://fontanarosaserigrafia.it/userfiles/file/jutuladevade.pdfIn PDF document text
    • https://eccdc.org/application/webroot/userfiles/file/lunel.pdfIn PDF document text
    • http://szsahsh.com/uploads/files/46812997518.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16089543e697ad---63457325622.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/fc0a64d1ec69aa2835dc817416dbecca/fuzugedubunovaxe.pdfIn PDF document text
    • http://sigep60s-ncbeta.com/clients/44785/File/gibexonon.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/a16a908d917a70299c061ddc99cb2d72/pufusodefejerotazarizod.pdfIn PDF document text
    • http://op-gold.com/ck_image//files/fexifawod.pdfIn PDF document text
    • http://vo23.ru/upload/file/35070746384.pdfIn PDF document text
    • http://envigest.cz/upload/file/bobosurapegaxolufa.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086edef985c8---89927733496.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/67019957330.pdfIn PDF document text
    • http://cedule-plachty.cz/files/file/49711269111.pdfIn PDF document text
    • https://dezsredstvompx.ru/wp-content/plugins/super-forms/uploads/php/files/d89ce632ec57bedc022aade2a31e87a7/4386603064.pdfIn PDF document text
    • http://www.dr.schure.net/ckfinder/userfiles/files/72409617674.pdfIn PDF document text
    • https://chp-travel.ir/data/file/5442957634.pdfIn PDF document text
    • http://eastmoorclassof1970.com/clients/4/43/4343e427eb1b0a0668350338a4d6b623/File/44724548635.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609086122eeca---76390600407.pdfIn PDF document text
    • http://dokturmice.com/ckfinder/userfiles/files/86145825745.pdfIn PDF document text
    • https://itchanoi.vn/uploads/news_file/49123587240.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb1686bd42---58532443736.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/f5d8fdc8ea0c92e2108349bdcf9a50f3/wepaforadurepaletav.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/23074a2e40ad10c435507c4f223ebb07/juriw.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/a8240cb92bdd1eab5334e079f9c4d768/68162623945.pdfIn PDF document text
    • http://newgrids.com/userfiles/file/vizipojogoluvizemibafefen.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/a4a989719032b598931bb3094ccde2d6/segebulezatajemufo.pdfIn PDF document text
    • http://cluster006.ovh.net/~greeters/be/ckfinder/userfiles/files/bogutadatex.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_off0000cb47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB47 10968 bytes
SHA-256: ee4b31accccd42ecf2c1f4f48e4d2d3c411d0f7ebc33bbe091a7a3ed72496775
font_01_sfnt_off0000e49e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE49E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fcb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB0 16336 bytes
SHA-256: 579606ba9bca5d4cf6a01f1dc837247d1285abf70cdab76128aaf4c6c43edd4d

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