Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3239f82b7ae11a2…

MALICIOUS

PDF

81.4 KB Created: 2021-09-09 04:08:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 24bf62d69a1420a8ef278a3be2c3800c SHA-1: 3bfbffc6d46776a8a17b800ba06299a04d735e31 SHA-256: f3239f82b7ae11a2364afaa0879bebe1ad6a3a85eda51f0534367c56545bce23
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://slezanie.eu/userfiles/file/jaxivazizedolozaxevun.pdf In PDF document text
    • http://kunmobile.vn/files/uploaded/20210901/file/folegixapemigajivaza.pdfIn PDF document text
    • http://crescentcarpets.com/userfiles/file/dalesidurukow.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/747762c57897fdf7aa3f9e7414ebd7f6/9300636000.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/lavawuxisuto.pdfIn PDF document text
    • http://medtravel.lv/images/hand_uploaded/files/zukomagegokozetukatituko.pdfIn PDF document text
    • https://lifesmart.lifesmart.ro/ckfinder/userfiles/files/69776422271.pdfIn PDF document text
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/ronazadolifuvelurofirog.pdfIn PDF document text
    • https://propactionvehiclesuk.tv/userfiles/files/74669748956.pdfIn PDF document text
    • http://neodentpetrosino.it/userfiles/files/nemexu.pdfIn PDF document text
    • http://totoumi.jp/upload/file/paxodomasazaw.pdfIn PDF document text
    • http://telegid.tv/userfiles/files/memunerikixu.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/20871665371.pdfIn PDF document text
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/46759706384.pdfIn PDF document text
    • http://alwaysshine.com/fileimage/file/janisilete.pdfIn PDF document text
    • http://usefchina.com/uploadfile/file///2021090108510090.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/rutenazekarojugerejuj.pdfIn PDF document text
    • http://aaas.handyfriendship.com/upload/files/ruvulawofa.pdfIn PDF document text
    • http://cetis156.neutronds.com/assets/js/ckfinder/userfiles/files/82437152978.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138b3e51deb1---45234838172.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613723df26635---50109648143.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents/files/645001677.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/54419301261.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=read+the+secret+language+of+birthdays+online+freePDF 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_off0000d8ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f0c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C4 11156 bytes
SHA-256: e1cbaea63b00965c1cfe03fa49100069cd237376d8deb840318e499364ffa94f
font_02_sfnt_off00010a93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A93 17632 bytes
SHA-256: fcabe3da5e2a875ec6bfd931e082a6e129de36f8e42b8b0a527dd1642dc19493

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