Malicious PDF — malware analysis report

Static analysis result for SHA-256 b55745f96e8f9c72…

MALICIOUS

PDF

84.0 KB Created: 2021-09-05 19:24:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3fecb5696589e93c79b8c58888fe16fd SHA-1: 0c8e77cffa543c277188ded7574cf6ba1bcdbde2 SHA-256: b55745f96e8f9c725013fc8434cd2198e29fd08bd21fe7875957845915258450
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and ClamAV as malicious, specifically as a phishing or trojan delivery mechanism. It contains numerous links pointing to compromised WordPress sites and potentially disposable hosting, suggesting an attempt to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://oniceh.ru/uplcv?utm_term=advantages+and+disadvantages+of+smartphones+for+students+pdf PDF link annotation
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609cffca18ce4---tagesabapezodifa.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/d1361070fc36635635b3aefa2a2be1eb/munogupoxedosezorowejike.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/16283037883.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/suzezov.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/b6ffc7db01985d7db4f4c4493adcec40/896168005.pdfIn PDF document text
    • http://ugrctrani.it/userfiles/files/mosume.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/84715802803.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/4d81e440cdc5cac5c9bb6cfb1a63fbb6/gujolumewexedaxazaxopu.pdfIn PDF document text
    • http://biomassasia.net/data_ed/userfiles/file/49170988040.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b2272fac764---75552658357.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/17003044367.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16122c66cecc60---karabolozatuwowe.pdfIn PDF document text
    • http://yuha.be/_files/file/tirisuk.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/kifejijaramisosuboxuko.pdfIn PDF document text
    • http://alphabodysupplements.com/newerac2c/userfiles/file/30878337358.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/vesepo.pdfIn PDF document text
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afe38a54fe1---77518080882.pdfIn PDF document text
    • http://kozelskadm.ru/files/uploads/files/36620267684.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160fd26fb882c3---kavow.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/xoxefero.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a5ce16cf5---duxajavoxat.pdfIn PDF document text
    • http://karate-talence.com/newsite/userfiles/files/gariga.pdfIn PDF document text
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/jizegogisiledajuderegu.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/vuvanotiluwojisokaf.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_off0000e33c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE33C 11044 bytes
SHA-256: 990d9a285d4a7eb49dc5056ff65112b934478140e9c618d092e3359bf7667da3
font_01_sfnt_off0000fc9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9D 17560 bytes
SHA-256: b6c64685193931b0020d14f81dcb2628f94f88ba93a67d63cfa29ce6c719ed2b
font_02_sfnt_off000129d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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