Malicious PDF — malware analysis report

Static analysis result for SHA-256 72bd2a17e79bbf63…

MALICIOUS

PDF

70.3 KB Created: 2021-09-04 03:01:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: be09ed38c3e0092c49643862b6dfd2fd SHA-1: b98d2dc7a6b2d009af9335cada0af73d15412f26 SHA-256: 72bd2a17e79bbf63377f43345deabffb14a7a576f680e65f72e2faec6720ed24
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or are structured as link farms. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. The presence of compromised CMS upload links suggests an attempt to host malicious content or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://hyeminshop.com/DATA/files/4917880709.pdf In PDF document text
    • http://koszyczarek.pl/userfiles/file/69689928213.pdfIn PDF document text
    • http://servmed.net/userfiles/file/vopajotigusokefavagaj.pdfIn PDF document text
    • https://kisikana.hr/UserFiles/files/nobabuzogoneza.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/kc5dmk21518brh2vb4q3i4hsfa/sepopemofefoveguzuxonudiw.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079ca98d9fee---76363066443.pdfIn PDF document text
    • http://carroll1975.com/clients/4/4e/4e2b018d07aaa5a30c3e4fca1c7a8df7/File/69923679115.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/zezosawujekabet.pdfIn PDF document text
    • http://ildungrice.com/fileupload/fckeditor/file/55858206123.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/33982648303.pdfIn PDF document text
    • http://asokmontridental.com/userfiles/file/92599450847.pdfIn PDF document text
    • https://12shio4.com/contents/files/38429046874.pdfIn PDF document text
    • https://luminex.pl/upload/file/89482051343.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607291f1b1299---fixem.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/lonupurilemekaz.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/g90msjba05fssrgkksj21ferq3/sasonuvorumel.pdfIn PDF document text
    • https://godahoian.com/app/webroot/upload/files/kafosugov.pdfIn PDF document text
    • http://bradzo-ep.com/uploads/files/83604108870.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/72009579230.pdfIn PDF document text
    • http://richmediahouse.com/admin/uploads/file/liremozepunadukeda.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/75720057082.pdfIn PDF document text
    • https://alirezamirmohammadi.com/images/upload/files/relob.pdfIn PDF document text
    • https://hps-gruppe.com/wp-content/plugins/super-forms/uploads/php/files/6s1bacsisfc84hj56gml89sfmh/ruwugemevawuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=french+alphabet+worksheet+tesPDF link annotation
    • 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_off0000b4cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4CF 15416 bytes
SHA-256: 3a3c35eb6db65677a67b6d04dd98c372eafe17edce4764c961fee222da2c0cb5
font_01_sfnt_off0000db66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB66 10672 bytes
SHA-256: db4027a840b7b201c4ba5aee0d5d2384c8bd2ef5ebbda5ad65daacce2e52a2ab
font_02_sfnt_off0000f3a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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