Malicious PDF — malware analysis report

Static analysis result for SHA-256 9397eda7b5c3838b…

MALICIOUS

PDF

82.6 KB Created: 2021-09-15 09:58:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 04e14aefdb56fbdda4f6bfd6a99f2608 SHA-1: 0ae815464a9bd0d039baa8f66917aa4fa113b9aa SHA-256: 9397eda7b5c3838bdbfb1b05a8fda9b3957ebeb286646d3d0fe8e1603ba16fee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. The embedded URLs and the nature of the heuristics strongly suggest an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://laborke.ru/uplcv?utm_term=themes+of+victorian+poetry PDF link annotation
    • https://haisanquangninh.org/data/dulieu/files/29394495245.pdfIn PDF document text
    • https://congchungnguyenlieu.vnpec.xyz/uploads/files/sosiluludakegiguxije.pdfIn PDF document text
    • http://to-tuong.com/media/ckfinder/files/54342606558.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161413ae77b282---14515117525.pdfIn PDF document text
    • http://h-p-n.fr/catalogue_dynamique/file/fadinuxadopit.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/161414324cf015---95086442723.pdfIn PDF document text
    • http://skncn.com/u/files/rijopaxuk.pdfIn PDF document text
    • http://avtokapriz42.ru/userfiles/file/tuwigadafogonod.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/728c3abad51f56643a851de8c8db6ac6/35913407213.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/88854921800.pdfIn PDF document text
    • https://artgreen.vn/attachment/files/59981371567.pdfIn PDF document text
    • http://travelci.ru/ckfinder/userfiles/files/5167169196.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/8c1a5859404b2e4fc48c02a538b8a6d2/vubax.pdfIn PDF document text
    • https://hanakspotrebice.cz/eshop/ckfinder/userfiles/files/75031256763.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/98284026855.pdfIn PDF document text
    • https://www.willmarshelter.com/ckfinder/userfiles/files/29822384173.pdfIn PDF document text
    • https://editions-tlp.fr/ckfinder/userfiles/files/49939629259.pdfIn PDF document text
    • http://teplolux72.ru/upload/file/zifuxitosomokavazag.pdfIn PDF document text
    • http://kabaretyimpresariat.pl/Upload/file/widezokokag.pdfIn PDF document text
    • http://sanzmendia.com/userfiles/files/lojunato.pdfIn PDF document text
    • https://ibextrail.com/editor-images/80928667940.pdfIn PDF document text
    • http://vansuloi.com/uploads/userfiles/file/sopewunajitokivoxe.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/26316135355.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/816df9322dee64c3215b94ec65599059/wazososekope.pdfIn PDF document text
    • http://pjzhengwang.com/upload/file/20210905_143744_184.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_off0000de6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f67d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67D 17516 bytes
SHA-256: 3d6cb2f7f09d136c3df960d640a2241880547c1c8a8e2312cda323894abb6c42
font_02_sfnt_off0001242a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1242A 10844 bytes
SHA-256: 5aecd5b6a3b65d99a1231290e5a79dcacdce9418a46cf6f0b6ed21f19fa2650c