Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1ae9256bc3ad541…

MALICIOUS

PDF

99.1 KB Created: 2021-09-13 14:55:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1c3f45f64c451194b8cef4356e47fb35 SHA-1: 329e65c4fa23dec6ebc4e9e3804658e1b1d3860d SHA-256: e1ae9256bc3ad5416ffc0b5a422d76e88b3b4089759f33a72fddf619f9a2f22b
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1071.001 Web Protocols

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites, likely for phishing or malware distribution. Notably, the document contains an instruction to disable security software, a critical indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://synerhu.ru/uplcv?utm_term=best+emulator+without+vt PDF link annotation
    • http://ip-golubev.ru/ckfinder/userfiles/files/42379515408.pdfIn PDF document text
    • https://songhong.info/userfiles/file/peluwizudibumojedugan.pdfIn PDF document text
    • http://julianina.dk/upload/file/48261301370.pdfIn PDF document text
    • http://bukvoznaika.ru/ckfinder/userfiles/files/75263969106.pdfIn PDF document text
    • http://glavis.biz/userfiles/file/gupaburubesag.pdfIn PDF document text
    • https://pfollowers.com/ci/userfiles/files/73937535154.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/41320893523.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/161372e3e427e7---vajutimuv.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/50891049098.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8937c946d---87350631756.pdfIn PDF document text
    • http://manchetenewsms.com.br/ckfinder/userfiles/files/sudin.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/baqd5d51qfq34q6cae09eo15es/13015291982.pdfIn PDF document text
    • https://regaluxiluminacion.com/uploads/assets/file/xubovitiwubepowavej.pdfIn PDF document text
    • http://tai-group.com/upload/files/wevubupibilituluro.pdfIn PDF document text
    • http://teleinwestor.com/userfiles/file/fuwejirerok.pdfIn PDF document text
    • https://heks-tech.com/app/webroot/userfiles/files/muratabenijaxulo.pdfIn PDF document text
    • http://dlevitin.ru/fck_editor_files/files/gasurinisej.pdfIn PDF document text
    • http://trips-in.com/ckupload/files/94419524306.pdfIn PDF document text
    • http://sklenicky-obchod.cz/web/admin/fckeditor/userfiles/file/39680532844.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d5683687ae---lebujaxesimefafakoguxud.pdfIn PDF document text
    • https://cristalparkhotel.com.ve/ckfinder/userfiles/files/girumobuvekuke.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/58724543943.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_off00011b43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B43 19928 bytes
SHA-256: de85e2b5e9246bb41b8b28a1da1e7cd266d7a67e8a9331df284fd3b877630196
font_01_sfnt_off00014ebf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000166d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166D6 10576 bytes
SHA-256: 79a95542f048058b10f57c2120121b80b70f64c88558bbb14b2257c77352d0eb

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