Malicious PDF — malware analysis report

Static analysis result for SHA-256 d15936a210b7bec0…

MALICIOUS

PDF

86.3 KB Created: 2021-09-16 18:09:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 27a68b4a3084f6f0af25f92a2f2d0fe9 SHA-1: 51e9fad6d683e4db55427e97e22579dd85929d7e SHA-256: d15936a210b7bec03dd186f80ad1811ece99472ef8a158fb0d60b94b37a8cdd1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a link farm pointing to numerous external URLs, many hosted on compromised or disposable domains, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://coretry.ru/uplcv?utm_term=injustice+gods+among+us+game+for+android PDF link annotation
    • http://dotykbylinky.sk/_subory/subory/67605454207.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/rilizebiwulagixanivobes.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/43de75723085c4a4b00d9c4f2a54ae84/91975721275.pdfIn PDF document text
    • https://herfection.herfection.tw/upload/ckfinder_temp/files/20210907135326.pdfIn PDF document text
    • http://www.alliance-bio.com/user_data/editor/ckfinder/core/connector/php/upload/files/xedudovejituwume.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/20219724112591.pdfIn PDF document text
    • http://wirheiraten.de/images/file/nivopoba.pdfIn PDF document text
    • https://baongochoa.com/upload/file/tabelewumuwitud.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/14780468582.pdfIn PDF document text
    • http://shanghaicruiseparty.com/uploads/file/7717656789.pdfIn PDF document text
    • https://ivantomanov.com/userfiles/file/wimalaki.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202109101517327619.pdfIn PDF document text
    • https://verlauf-ekb.ru/admin/ckfinder/userfiles/files/87617212261.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142aff8a0d18---gotuxamoribera.pdfIn PDF document text
    • http://cherriestattoo.com/ckfinder/userfiles/files/49051318606.pdfIn PDF document text
    • https://pro-biomed.com/admin/userfiles/file/40179129665.pdfIn PDF document text
    • http://rutka.pl/media/upload/files/d757e543d2c8159226073ae43efa83fb.pdfIn PDF document text
    • http://suliaox.com/v15/Upload/file/2021911954286794.pdfIn PDF document text
    • https://drosamahetta.com/userfiles/file/29257542813.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/xunenudolovevasumuzunora.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614022e092f11---kodigib.pdfIn PDF document text
    • http://cluster006.ovh.net/~greeters/namur/ckfinder/userfiles/files/7200947474.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_off0000edcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105DE 17536 bytes
SHA-256: fe37629f68c9d4d34b84121b076323fe432cca2ac39de1bf83afe7db2b07ea5a
font_02_sfnt_off000132d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132D3 10956 bytes
SHA-256: b47abce5528833d14be5c4b4b10f5909c7710716f400abf2ea6be60821dc5c4f