Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ca8dbb059e0f4ac…

MALICIOUS

PDF

84.6 KB Created: 2021-09-08 19:17:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3246311f9d2a1be9b9424dfa74ae4f05 SHA-1: 8c10e4f34fe56bbbe4ad5de6777a45992a34c379 SHA-256: 5ca8dbb059e0f4aca51763de24a93e43ea75fbaea943f7cf8679290a8b8d4cd5
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites, suggesting it's designed to lead users to malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. While no scripts were directly extracted, the nature of the links and the PDF structure align with techniques used to exploit users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/b9caac836b3bdccb5146af17ceca699d/80831643175.pdf In PDF document text
    • https://bosingels.nl/ckfinder/userfiles/files/8134729571.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16134ccc715f6a---85576026469.pdfIn PDF document text
    • http://willbramephotography.com/zubavudunipo.pdfIn PDF document text
    • http://2sisaccount.com/userfiles/files/ruzilisojedolupub.pdfIn PDF document text
    • http://www.taylormadetc.com/siteadmin/ckfinder/userfiles/files/vajorap.pdfIn PDF document text
    • http://gsmontaggi.it/userfiles/files/fidaguzebobibofexebakoke.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/856bc216c79eb95d163a9f19b1c45520/66946480789.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/161317f1dc261a---13221235683.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/76865356295.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/7v4ci01i02e3pgiruioddf4c22/pidebiralifesomovoked.pdfIn PDF document text
    • http://oldstat.ww.tj/img/file/12017817545.pdfIn PDF document text
    • http://tplustech.com/images/ckeditor/files/gimufabugarotavuw.pdfIn PDF document text
    • https://dragonexpressml.com/userfiles/files/bogudewitabomiranotuwo.pdfIn PDF document text
    • https://albizy.com/ckfinder/userfiles/files/besipifamalumez.pdfIn PDF document text
    • https://shoppingplanet.cityplanet.ro/ckfinder/userfiles/files/luwevalilegefatelulaza.pdfIn PDF document text
    • http://fastcredit.ge/userfiles/file/83799270804.pdfIn PDF document text
    • http://flixgolf.com/ckeditor/ckfinder/userfiles/files/jomir.pdfIn PDF document text
    • http://bananamusic.tw/uploads/files/202109030620097995.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130e1cadf04c---toxamakitoriniwejanasope.pdfIn PDF document text
    • https://bda.ch/ckfinder/userfiles/files/56717309086.pdfIn PDF document text
    • http://pass38.com/images/contentimages/files/9582340751.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=miranda+warning+in+spanish+pdfPDF 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_off0000e1fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1FA 10460 bytes
SHA-256: a425fbdb021255d7bc5fed84525c2786c7ea8d3cf02fedbf0236acd47d8f4cd8
font_01_sfnt_off0000f969.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF969 19680 bytes
SHA-256: d2d01f0274e43d118a13fdc1288ee0acfa8b27125ad1bd0f13cbd10e1dae7129
font_02_sfnt_off00012cbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1