Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a4efe0ae129b184…

MALICIOUS

PDF

84.3 KB Created: 2021-09-03 01:04:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fc28a94e7980ddeaa9c89bf88e96350c SHA-1: 89d16935e2c671dabacd8f9a12212ea0d5a1f49f SHA-256: 2a4efe0ae129b184b3b8252db7812f201e7d320f77b567335bdf5f4fbd6aad50
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous external URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting it is used to host or link to malicious payloads. The embedded JavaScript likely facilitates the download and execution of a second-stage exploit or malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://dm288.com/slicice/file/24403534953.pdf In PDF document text
    • http://skyrun-arser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210828030916642761tikmat.pdfIn PDF document text
    • https://fentesmakina.com/paket/upload/files/14671704999.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/52811c6cf61a3b7ac51a2a11f10b4c0e/81952562180.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/43824823953.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/13467400539.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/lelewizitekowotemus.pdfIn PDF document text
    • http://ghrnightinwhite.com/clients/7/72/721f26fb9237119891afe8d29dbdfc29/File/wewas.pdfIn PDF document text
    • http://thegreenlegacykeepers.com/clients/e/e8/e8dc17949b7ef813e9937e453902477f/File/vipiputubizumem.pdfIn PDF document text
    • http://bukharaalpharetta.com/sites/default/files/file/49479499216.pdfIn PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/a986e7c81dc87f18c10b034a2f1e7502/90464175769.pdfIn PDF document text
    • https://galaxy-training.com/userfiles/file/75465410190.pdfIn PDF document text
    • http://veterinariacomportamentale.it/userfiles/files/97226060522.pdfIn PDF document text
    • http://uni-farm.pl/ckfinder/userfiles/files/39154883778.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/380e25df464ef3e483766b49796b7b21/58017251079.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161168afb0086e---wutesil.pdfIn PDF document text
    • https://12shio3.com/contents//files/61232089917.pdfIn PDF document text
    • https://maxlinder.com/admin/assets/ckfinder/userfiles/files/40342357156.pdfIn PDF document text
    • https://myclubowners.com/userfiles/files/55659222098.pdfIn PDF document text
    • http://wolfroccatiassociati.it/userfiles/files/76966441944.pdfIn PDF document text
    • http://eapver.com/upload/ckimg/files/202108162331139601.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607212cf79bc4---27611284063.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afc6d69b1e8---berelolekarokulikepogolad.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870ff211a90---sikatebepivokalosejon.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/16778106596.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=rapidex+english+speaking+course+book+pdf+in+englishPDF 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_off0000e18e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE18E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A0 18216 bytes
SHA-256: 6f048ccaebbae4dd33994f317a4838bff49fddc990854f40fe2a6f21e2d21252
font_02_sfnt_off000128c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128C5 11280 bytes
SHA-256: 704f93751b74f9c7a61eb6ba711d22d0099a06f28a615f37864702d3a8618dd8

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