Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b35c61887481813…

MALICIOUS

PDF

69.7 KB Created: 2021-09-17 23:44:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 04a457095060983add0ce2b6ad4157f8 SHA-1: 83f7825b17242531c9704e1aeb5e2129a4b0f362 SHA-256: 3b35c61887481813e23f4c928604590309f2d8b4b781b9bb9643418ed19f9164
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised CMS upload locations and disposable hosting, indicating an attempt to obscure the final destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vwb.mrv-educationservices.com/content_file/files/rozuzugarivuzazaj.pdf In PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/2qf4f9eocc7tto26c1ltm74gtb/32017714209.pdfIn PDF document text
    • http://laibros.com/ckeditor/userfiles/files/fiwigabiletuderiwud.pdfIn PDF document text
    • http://ricarda-allegra.de/userfiles/file/25975358952.pdfIn PDF document text
    • http://kystar.net/filespath/files/20210914011618.pdfIn PDF document text
    • http://upasamed.org/Content/uploads/files/138309161.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/88319142371.pdfIn PDF document text
    • http://www.ppk-kp3k.kkp.go.id/ver2/extra/ckfinder/core/connector/php/media/ckfinder/files/70873360385.pdfIn PDF document text
    • http://wjcopy.com/upload/files/kigenogel.pdfIn PDF document text
    • https://confeccionesruiz.cl/UserFiles/File/nikotakelimugekukekowi.pdfIn PDF document text
    • https://shivajigrihnirman.com/singhania/downloads/file/rumotebesa.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/2au3jn82u9gtv8aleomrib8216/duweguzibenilew.pdfIn PDF document text
    • https://rtvpuls.com/ckfinder/userfiles/files/linugizez.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139a51db4d7d---55043699397.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137516b8994e---kuremarojeri.pdfIn PDF document text
    • http://koutingchina.com/upload/files/28995022558.pdfIn PDF document text
    • http://gz-chengeng.com/uploadfile/files/liwame.pdfIn PDF document text
    • https://ezsprinting.com/userfiles/file/nupopevonajotifudo.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142abc879ef6---logosifixilifakob.pdfIn PDF document text
    • https://ver9.sonikgps.com/ckfinder/userfiles/files/dafiwuzubiwepi.pdfIn PDF document text
    • https://zegaoyun.com/calisma2/files/uploads/wofaf.pdfIn PDF document text
    • https://globalcareerclub.com/FCKeditor/userfiles/file/rigefixige.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613839706cfdd---4805746260.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=creature+io+gamesPDF 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_off0000b345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB345 15132 bytes
SHA-256: 452084477d33e25dc1586c4ab8181c26532d444abb39ccf2ed667a73cd170eed
font_01_sfnt_off0000d98a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98A 10432 bytes
SHA-256: 7ed938c0b9e854c8563339fe77e9e7ae0f9248addbb17a78812148af626765d5
font_02_sfnt_off0000f145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF145 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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