Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2825b9e6971da3f…

MALICIOUS

PDF

79.2 KB Created: 2021-09-08 02:13:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2b22f2e3b93e23f6b64762bb7549e200 SHA-1: a2d3c88cc93f324fee646781a9bb66062cb0b27c SHA-256: f2825b9e6971da3fbefe007fe6c079d48a71562e0db22c29089e5c1224e42f23
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 heuristic 'SE_BROWSER_INSTALL_LURE' suggests the document is designed to trick users into installing malicious browser extensions or updates. While no scripts were extracted, the presence of numerous URLs, some pointing to compromised CMS uploads and link farms, indicates a phishing or malware distribution attempt. The document likely serves as a lure to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • 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://www.pessin-location.fr/ckfinder/userfiles/files/26075263332.pdf In PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/3ed49350c6e0034fd3ade47690702c24/fededoxeper.pdfIn PDF document text
    • http://gonvvama.net/filespath/files/20210904013530.pdfIn PDF document text
    • http://kenzoum.org/home/integrity/public_html/ckfinder/userfiles/files/45191462079.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/68807401540.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b521451eb00---44403917043.pdfIn PDF document text
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/665a0b3b22a499624472ded74b88b75e/22252572684.pdfIn PDF document text
    • https://mzlpro.com/web/img/podborky/files/datifugujovadipozuzu.pdfIn PDF document text
    • http://alvit-bk.ru/userfiles/file/paxunisug.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/l9bd8g2bqlh2v0i8lg3b1ppvh4/fazepimune.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/79092368804.pdfIn PDF document text
    • http://thesciencenetwork.org/uploads/files/zexove.pdfIn PDF document text
    • http://ecoaga.com/documentos/file/kavitu.pdfIn PDF document text
    • http://alexforstarlight.com/clients/4/41/4125d763bdae894b2c088b8c4c0f4705/File/fizawotev.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/sogenepomep.pdfIn PDF document text
    • http://retco.ge/ckfinder/userfiles/files/fozanezofuge.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/d6b6qup72hok1f4m0kk832qccn/zulefatisagunifetodu.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078957621898---4042789007.pdfIn PDF document text
    • http://branpc.in/ckfinder/userfiles/files/93075360595.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/1fac038d16dccc3af200b0656e2d7d55/68195743328.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/31107028997.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/sutupenenegixaku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=luna+lovegood+glasses+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_off0000d12c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD12C 10504 bytes
SHA-256: 11af19a6bb46e4d2447d957545e041a743611d17f15ddf67bc601367b034e45c
font_01_sfnt_off0000e904.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE904 17852 bytes
SHA-256: 2c225c280f42f0b030c8fd9f047449647295ec36d511f3c97b6967c5e08694ca
font_02_sfnt_off00011741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11741 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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