Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e4bd3dc1711eb66…

MALICIOUS

PDF

82.0 KB Created: 2021-09-08 13:34:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 068d58d1c9d11136c0815ca889bc1afe SHA-1: 3b967d5599603aca5085d226e0a9318123298582 SHA-256: 8e4bd3dc1711eb6631f660e85dc3f1415fd4c0704c7e50eb3b08fd572a775d19
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that form a link farm, directing users to potentially malicious or phishing websites. Heuristics indicate these links are hosted on disposable or compromised domains, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://crysiq.ru/uplcv?utm_term=dolch+basic+sight+words+for+grade+5+pdf PDF link annotation
    • http://medizator.ru/ckfinder/userfiles/files/12806721321.pdfIn PDF document text
    • http://musicfriend.vn/public/default/ckeditor/files/zufolitivajegejog.pdfIn PDF document text
    • https://osiindia.org/ckfinder/userfiles/files/jaduputasebopivox.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16132bf3b089f9---dodawudutebojaluwirorolu.pdfIn PDF document text
    • https://aquatrustfina.com/userfiles/file/59631032485.pdfIn PDF document text
    • https://ihotel2b.com/upfiles/editor/files/kolup.pdfIn PDF document text
    • http://melabo.com/upload/files/duvizik.pdfIn PDF document text
    • https://muratay.nl/userfiles/file/32228118576.pdfIn PDF document text
    • https://atcotourismtravel.com/userfiles/file/96276235257.pdfIn PDF document text
    • http://movesearchesuk.com/userfiles/file/vamazagidataxotufiwovo.pdfIn PDF document text
    • http://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/lajuwesatuxuzavepekewosar.pdfIn PDF document text
    • http://musicandyouapp.com/webupload/editorimg/files/86031910197.pdfIn PDF document text
    • http://coinproject.com/userfiles/image/file/rivekapovefujone.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/c0f1b32d8c0d263e97f91430cc1048cc/68260692695.pdfIn PDF document text
    • https://fatheragneliti.com/wp-content/plugins/formcraft/file-upload/server/content/files/161327234287d1---90532377640.pdfIn PDF document text
    • http://sxhk365.com/uploads/file///mosab.pdfIn PDF document text
    • https://rent-1.es/ckfinder/userfiles/files/kazipesogugi.pdfIn PDF document text
    • https://keralatemples.info/ckfinder/userfiles/files/wipiborefexu.pdfIn PDF document text
    • http://gourmethousemacau.com/UploadFilesfile///60877241358.pdfIn PDF document text
    • http://sweepinstyle.com/userfiles/file/24169089827.pdfIn PDF document text
    • http://belovosushi.ru/files/xafifozixupukeb.pdfIn PDF document text
    • http://vibestedu.com/_UploadFile/Images/file/13916298537.pdfIn PDF document text
    • https://nls.vn/upload/files/zeviw.pdfIn PDF document text
    • http://ipmarketing.net/FCKeditor/editor/filemanager/connectors/userfiles/file/japavufapirununeri.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_off0000d770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD770 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF87 11156 bytes
SHA-256: bab9f4d89ccc880d2437147c9e2d7de4cf15c38b4f4d11f9dfbb46f2e629e49e
font_02_sfnt_off00010970.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10970 18760 bytes
SHA-256: d581d9fef1e88a829f9324d44fef41d676c80fbbecd22c5001599242715fb1ca