Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d56c02e857e0d5c…

MALICIOUS

PDF

82.7 KB Created: 2021-09-07 09:22:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 97bd5cbac646367fadc92b3c5f999dfc SHA-1: 0a8d8630f51a34565021282a32794ff9fa643688 SHA-256: 5d56c02e857e0d5ca4a6a091a395774158e81367b97b56edca84c48972f0c748
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded URLs are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://wastran.ru/uplcv?utm_term=bentuk+bentuk+legitimasi+pdf PDF link annotation
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/8dedaf84316cab2c8331ad4e91441957/79887997623.pdfIn PDF document text
    • https://lienlacanien.com/img_pages/file/nowawabajez.pdfIn PDF document text
    • http://dostavkaturov.ru/files/file/pazuzamanad.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/64482696327.pdfIn PDF document text
    • http://cofetariafraguta.ro/UserFiles/file/mafebifu.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/60629772605.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/r5ha4l5j4sbd01qn9p5c4orul6/20175414518.pdfIn PDF document text
    • http://kasintorn.com/images/upload/files/xikifumiv.pdfIn PDF document text
    • http://espacioschillout.es/images/admin/file/kofenopozalaketujovod.pdfIn PDF document text
    • http://ecandrychow.pl/Image/files/49313225900.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/bukinem.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160a1189a67ef4---26454418247.pdfIn PDF document text
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/0d517e72f7728a70e41343a8f1cdf847/gazutivip.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b25feba7678---nikurovi.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16074b1bdb47ce---16954357856.pdfIn PDF document text
    • http://neoneophytou.com/ckfinder/userfiles/files/befobulepufemenosi.pdfIn PDF document text
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c68cf080861---zisinarixumowugixenetozu.pdfIn PDF document text
    • http://www.lugashotel.com/data/editorfile/gaponarojowid.pdfIn PDF document text
    • http://kesifveotesi.com/files/rawubikegu.pdfIn PDF document text
    • http://starrsgazette.com/admin/images/file/76208115288.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160884ecf645d8---36292006488.pdfIn PDF document text
    • http://www.doctor-carpet.com/wp-content/plugins/super-forms/uploads/php/files/2h33hq16ehgiqqe1k3k8t8f4m5/xugeboworimekilif.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608995320c77c---93146125590.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/biwusipenagagejebabopedaz.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_off0000defe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFE 11008 bytes
SHA-256: 7420b828f881637ca59839b571ec38fae0fe3e062399804d15f70f5302e38c48
font_01_sfnt_off0000f832.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF832 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11044 16592 bytes
SHA-256: c1fb0480ea104f22aa7c00ea9cc73ed331cae92fa5d8d41cdc67f58fbd6bae63