Malicious PDF — malware analysis report

Static analysis result for SHA-256 77958947f9d0d796…

MALICIOUS

PDF

80.2 KB Created: 2021-09-14 12:33:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c83123649a366416001459ae4f294e1d SHA-1: cf0fbf3c61f066de8144b49192f9be0a24bdc0e6 SHA-256: 77958947f9d0d79604b09ca25a0d9376bff85e762b41b0dddcc86267510c3ce1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery through these links. The presence of 'utm_term=hack+mod+games' in one URL suggests a lure for potentially malicious software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://irlanc.ru/uplcv?utm_term=hack+mod+games PDF link annotation
    • http://vitalenzyme.com/uploads/fckupload/file/89797298481.pdfIn PDF document text
    • http://pengyou-english.com/FileData/ckfinder/files/20210912_2DDF37C60F2F89E3.pdfIn PDF document text
    • https://grandhotelushba.com/userfiles/file/66958356640.pdfIn PDF document text
    • http://sakem.org/userfiles/files/zubukadogud.pdfIn PDF document text
    • http://studiosaletta.it/userfiles/files/56531651020.pdfIn PDF document text
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/38196142993.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/boxonafojitomemafogilus.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f0a32a061b---sawisovosanosisasulogab.pdfIn PDF document text
    • http://belstroyiz.ru/img/file/jiwelewefoxosusijaje.pdfIn PDF document text
    • http://giaydantuongphongkhach.net/images/news/file/jumoxomomoxawo.pdfIn PDF document text
    • http://www.gulbaharsigorta.com/contentData/file/90213051829.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/64171989658.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/usg23otu73gf5b73hnq37g7vi4/repud.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/lawupikurelutosawo.pdfIn PDF document text
    • http://zgic.ru/!upload/files/nirafawimevimeponu.pdfIn PDF document text
    • http://intechsol.kz/wp-content/plugins/formcraft/file-upload/server/content/files/1614044f7197d5---30468419742.pdfIn PDF document text
    • https://pr-dienst.ch/file/vujiwajov.pdfIn PDF document text
    • http://fra2ange.it/userfiles/files/44591047418.pdfIn PDF document text
    • http://pnc21.com/files/fckeditor/file/1543656542613aff97af3de.pdfIn PDF document text
    • http://remont-m.com/userfiles/file/fatixev.pdfIn PDF document text
    • http://e68momo.com/shopadmin/upload/files/pomupi.pdfIn PDF document text
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/luxopotegun.pdfIn PDF document text
    • http://uchid.com/uploads/file/99205670824.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_off0000d57f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD57F 17984 bytes
SHA-256: e33fbc3d7f0ede5bc520fa8b8dc2a1d5aa938c0b21a5aa7b91fb37af5117a63e
font_01_sfnt_off000103de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BF5 10356 bytes
SHA-256: bad95f4636c7a4b12feb784170f022ae0b9f76b61bf3f0520fc47ba450373a88