Malicious PDF — malware analysis report

Static analysis result for SHA-256 5801518cbbfd81c0…

MALICIOUS

PDF

80.2 KB Created: 2021-09-13 20:46:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ab1fa61cf1b60bd50a2af1ff992b78d1 SHA-1: f7dc45d12419755544ba70f0937501d5c2aafcbd SHA-256: 5801518cbbfd81c068d952ec22d267d9cb1b73adcf098a2567472196050e22e3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicate a pattern of using such sites to host malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to phishing or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • 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 http://www.performhabitat.fr/bundles/astadmin/js/ckfinder/userfiles/files/87538673395.pdf In PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613526f84653b---wunufavatenikujajela.pdfIn PDF document text
    • http://annabarons.com/files/files/zinavigo.pdfIn PDF document text
    • http://huichem.com/ckfinder/userfiles/files/denapagatofodut.pdfIn PDF document text
    • https://kermanrooz.com/img/files/73115562102.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/wodekivumazenopedama.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/v5kahvml25rtnm3up49v1iv625/14746669527.pdfIn PDF document text
    • http://hitelesen.com/userfiles/file/nofebo.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/12590161970.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/94934010096.pdfIn PDF document text
    • http://mariancozma.com/_user/file/faraludabawu.pdfIn PDF document text
    • https://www.pepinieres-gey.fr/ckfinder/userfiles/files/telesudosori.pdfIn PDF document text
    • http://immobilier-valence-agen.com/userfiles/file/85063383124.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210909081503.pdfIn PDF document text
    • http://itcbeautytrainingschool.com/userfiles/file/49316242853.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e83dc21972---fiwufapejetita.pdfIn PDF document text
    • http://vina2002.com/uploads/files/japum.pdfIn PDF document text
    • http://zamaro.cz/images/fcke_files/file/29607773579.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/161338247e8710---rukokodunenevobupato.pdfIn PDF document text
    • http://zzquansu.cn/d/files/fidubofijopir.pdfIn PDF document text
    • https://europawindow.com/app/webroot/img/main_content/files/47198029556.pdfIn PDF document text
    • https://shevian.com/images/file/pipizikekaxuduves.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=download+wrestling+games+for+mobilePDF 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_off0000d450.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD450 17476 bytes
SHA-256: 1fa12cc09d85cad9a23639d778154c1b7a2e04af1ba06d4d62a958436cc407cb
font_01_sfnt_off0001018c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1018C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119A3 10924 bytes
SHA-256: c36fe5da08d34346721b6a4585cd1418cbf84761166fb7ad2549f6037944b5cc

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