Malicious PDF — malware analysis report

Static analysis result for SHA-256 68b45cd93e992909…

MALICIOUS

PDF

81.5 KB Created: 2021-09-10 03:38:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 02f64c262c98b8dc4f1b2593eca9f843 SHA-1: a87db6f6302f76db31901d447446b19d3d866079 SHA-256: 68b45cd93e992909f6986282b599ef7ba54866e43617dd1cd3d8f5d19d2f2e6a
164 Risk Score

Malware Insights

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

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 PDF files hosted on compromised or disposable domains, likely to facilitate further malicious activity. The presence of a 'download button' lure reinforces the phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://oniceh.ru/uplcv?utm_term=warcraft+torrent+magnet PDF link annotation
    • https://dom4m.lv/userfiles/files/37478731146.pdfIn PDF document text
    • https://sanghvicranes.com/staging/media/liluvijilaf.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/kapokexaxo.pdfIn PDF document text
    • http://allycatering.com/userfiles/dowilekavuxitafedirig.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/if6j0bb4umnh2egh45lj12kh11/39296680117.pdfIn PDF document text
    • https://miltonmattox.com/userfiles/file/figug.pdfIn PDF document text
    • http://okvin.org/userfiles/file/wowop.pdfIn PDF document text
    • https://winpoasia.com/ckfinder/userfiles/files/29977744600.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/ragif.pdfIn PDF document text
    • http://zzps.pl/userfiles/file/rezalozirezoza.pdfIn PDF document text
    • https://sunsoftinfoway.net/ckfinder/userfiles/files/jejavimeg.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa73ca68d5---10003391683.pdfIn PDF document text
    • http://sun-apartments.pl/data/pages/fexesokur.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613415a56dfba---vivetozisetilodevidigo.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/76956404772.pdfIn PDF document text
    • http://abwclayton.com/uploads/files/96372390360.pdfIn PDF document text
    • http://studioboscono.it/userfiles/files/lataweramapafemagevubeguj.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/3012a9ad1d1502f9c719f20f9808aaf9/6565025354.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135f2e6cf2ce---gawukaxonowanewisato.pdfIn PDF document text
    • https://xistenze.nagydavid.com/files/files/50676348809.pdfIn PDF document text
    • http://lamorenj.com/userfiles/files/limusupajavufajifitegesuf.pdfIn PDF document text
    • https://panama4d.com/contents/files/robibulegetujifolimus.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/jeselawirigozuxuro.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613010f33bcb8---90553580252.pdfIn PDF document text
    • http://talcmanagement.com/uploaded_files/userfiles/files/ribevekezabexulozunudo.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_off0000da5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5A 10364 bytes
SHA-256: eb83f9998838cb3851ba98807ee6e829c3cd65f59bdb6af1c621170365be36c9
font_01_sfnt_off0000f1cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CC 18168 bytes
SHA-256: 2ed086099bd8c8c16181ae5debb5e81f6957e30d256097b3dc19ab3f4c4ca67a
font_02_sfnt_off000120e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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