Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3f9a614c195ecfc…

MALICIOUS

PDF

79.7 KB Created: 2021-09-04 17:42:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a780975ef04395846205d478d9324e2f SHA-1: adb4f4b38a086918ebb0b672c863c795e22df25e SHA-256: a3f9a614c195ecfc3fc7a5b921a58611f2d0cd60024564cfdb11b1ad67ce4623
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The 'SE_BROWSER_INSTALL_LURE' heuristic suggests the document is designed to trick users into installing malicious browser extensions or updates. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution scheme, likely involving a social engineering pretext to execute further malicious code or redirect the user to a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://binarbaidservices.com/public_html/userfiles/file/62065445280.pdf In PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/9c9663ef88539a0f5d0ec8b6f5d75a93/59806562929.pdfIn PDF document text
    • http://georgefamilyreunion.org/clients/86186/File/xikedizabizogezi.pdfIn PDF document text
    • http://cainghienbinhduong.com/uploads/userfiles/file/26512157672.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5c1ce0283e---banum.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/4f9f9abb7e5922d5ae189c1dcf6aa85a/lorawepibiwe.pdfIn PDF document text
    • http://blueyee.com/upload/file/201936206300.pdfIn PDF document text
    • http://beta-rc.com/upload/files/pifexodesumejizuxobu.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/634212270c6c05e5c99b87f06632f258/10040448868.pdfIn PDF document text
    • https://magnettoptan.com/upload/ckfinder/files/52753588953.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9b6e1dbf0---108994630.pdfIn PDF document text
    • http://bulongvungtau.com/media/ftp/file/kosexutaxawugazasep.pdfIn PDF document text
    • https://living-stone.lu/userfiles/files/jijemixukotejobitukizi.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/jg5uoac5begroc7npsjjdl4jbv/dugekidada.pdfIn PDF document text
    • http://porpora.biz/imagenes/imagenes_contenidos///femixowowerukaganapelal.pdfIn PDF document text
    • https://traiteur-troyes-mariage-buffet-aube-10.blaisot-traiteur.fr/ckfinder/userfiles/files/jetiwisaduzujapit.pdfIn PDF document text
    • https://www.lumisolar.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1607043fe98fd6---91626159817.pdfIn PDF document text
    • http://learningkey.org/userfiles/89719801548.pdfIn PDF document text
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/tumoravuzokoma.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/69748559606.pdfIn PDF document text
    • https://www.milestonesmn.org/ckfinder/userfiles/files/memamedidarogijozare.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/9e568a97fe6f132ad0ef156d0d692e27/32693133702.pdfIn PDF document text
    • https://bishopsalamatkhokhar.org/userfiles/file/wasagowufawadiduremi.pdfIn PDF document text
    • http://pvvc.cz/files/sezitilevufuxadez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=react+pdf+viewer+githubPDF 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_off0000cf58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF58 18556 bytes
SHA-256: 244d8f8438fdbb376e93e17cb0cdd567e916a840a4e2e925dd2e7296c3245768
font_01_sfnt_off0000ffe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE2 10900 bytes
SHA-256: 837ac1416ea1256e5a348f4d8f71eab0aa9d85e193c0018fb0cad5f9151a1fce
font_02_sfnt_off000118dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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