Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3f60d4c33d076cf…

MALICIOUS

PDF

77.1 KB Created: 2021-09-16 21:01:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 09cf7f8a32edb62799e7592f82493165 SHA-1: cb78f93498673f36425fa5a31b314d517860bdd9 SHA-256: d3f60d4c33d076cf5cdb6ed47a14687bbec49e76e4288aa580f3119d152bd4ea
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to a link farm, with many hosted on compromised or disposable domains. The primary function appears to be redirecting users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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=snow+rider+3d+unblocked PDF link annotation
    • http://starinviter.com/ckimagefiles/98106419920.pdfIn PDF document text
    • http://thedreams.cz/files/wezofe.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/74570214322.pdfIn PDF document text
    • http://www.klimavill.com/data/editorfile/59516066374.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613912863bcac---92819136170.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///fotuzuzabawejak.pdfIn PDF document text
    • http://dvg.asia/ckfinder/uploadfiles/files/15297447150.pdfIn PDF document text
    • http://americasbestwingsbeltsville.com/uploads/files/zikotuderej.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/51493334368.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/rujevuwil.pdfIn PDF document text
    • http://espokebar.com/uploads/files/24883312870.pdfIn PDF document text
    • https://classoft.ro/userfiles/file/xavax.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/69124195361.pdfIn PDF document text
    • https://i-try.tw/upfile/files/2021/09/07/42392668075.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/togajiwabatonejo.pdfIn PDF document text
    • http://ildong.org/sa_upload/userfiles/file/20210909135347.pdfIn PDF document text
    • http://daehnfeldt.com/userfiles/file/banatudavapux.pdfIn PDF document text
    • http://studiofagiani.eu/userfiles/files/22067027537.pdfIn PDF document text
    • https://designmaster.in/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/14811979459.pdfIn PDF document text
    • http://shriramashramssschool.org/userfiles/file/50741282990.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/10c49d8e933f10e78d061273605a226b/mowetawemuxulomivoralafu.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/1f1ae6009b46b19287fdef7ac319c4e4/xozazazeferamakigisajor.pdfIn PDF document text
    • http://camelliafb.com/uploads/files/202109031527471439.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_off0000cae3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAE3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e2fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2FA 10600 bytes
SHA-256: c435c2eb7d719286f1e133373a8ca969eb13c683a2e0642a8ab47bc45553a827
font_02_sfnt_off0000fb5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB5A 16792 bytes
SHA-256: 1adf20cf17fc28c6c30630f0a3362a32b9fa6ec8cb8eb62ecdfa8ac8dc5d2bdf