Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d6c658260bfd171…

MALICIOUS

PDF

70.7 KB Created: 2021-09-25 05:46:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: e36c31fb07f68a69932029fe5553cac3 SHA-1: b1ebf4dc385f461e15c860d13c689209f47476d6 SHA-256: 9d6c658260bfd1711ef02168c98bef183266ea603a2681d226f2f6be8b68e497
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of techniques used to 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 https://queure.ru/uplcv?utm_term=keyboard+for+gta+san+andreas+android PDF link annotation
    • http://www.masozilina.sk/ckfinder/userfiles/files/28553695459.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b530e8a64---lipadojezano.pdfIn PDF document text
    • https://tinhhoaxanh.vn/userfiles/file/70674337360.pdfIn PDF document text
    • http://gaushalango.com/uploaded_files/userfiles/files/mamikanopotinabeki.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/gumavasitamumo.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e5032346b9---31418119126.pdfIn PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/99908183869.pdfIn PDF document text
    • http://gospelpour100voix.com/fichiers/newsletter/file/7144042135.pdfIn PDF document text
    • http://onlinetradeshow.ir/uploads/files/90603865407.pdfIn PDF document text
    • https://stepweystudy.com/ckfinder/userfiles/files/pabujutedevab.pdfIn PDF document text
    • https://sakura-bashi.com/uploads/files/202109240701303078.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/savugivitazigusam.pdfIn PDF document text
    • http://yuqiaohome.com/uploads/files/202109152251143646.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/161408c2535e01---2788643766.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/92341465824.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/gufimafosinasugexewidida.pdfIn PDF document text
    • http://aimic.com/userfiles/file/runixazusugevamuviwabus.pdfIn PDF document text
    • http://audiohrestomatiya.ru/content/file/soxopafoperadus.pdfIn PDF document text
    • http://polimak.pl/userfiles/file/fuzubow.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/161382f6421781---11477798753.pdfIn PDF document text
    • http://becskeicsodajo.hu/admin/fck_upload/file/lazanupomemixad.pdfIn PDF document text
    • http://albertopizzetti.it/userfiles/files/13288552850.pdfIn PDF document text
    • http://goldia.cz/data/file/38582187859.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_off0000b2e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2E8 10728 bytes
SHA-256: 9a51e9ce7dabb2064cd61231196265c2cd1aa84b135f1a0a8dd41c00f48f4d9f
font_01_sfnt_off0000cb7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB7F 16124 bytes
SHA-256: e2435e3bf7da44265bb6e595f40655b01b5aef8d34c6161d1a21bb4c721f9cb0
font_02_sfnt_off0000f4d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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