Malicious PDF — malware analysis report

Static analysis result for SHA-256 2da818a3f5f0b5db…

MALICIOUS

PDF

86.6 KB Created: 2021-07-29 18:44:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 66428f18a2d7b2b05ca2f941caae1871 SHA-1: ddb7a8c904c56412082d1ac3fbd7d2f8da4f468b SHA-256: 2da818a3f5f0b5dbe1b9b43cd8dce5d4b56312a8592eeea84e3ebeecf68503f9
196 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm and a lure for browser extension installation. While no scripts were directly extracted, the nature of the lures and the detection names suggest it likely attempts to download and execute a second-stage payload, potentially leveraging JavaScript for obfuscation or execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://karapinler.com/calisma2/files/uploads/jagonewaxi.pdf In PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160daa56e09efd---biwinovubevot.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/xarakigopezibeber.pdfIn PDF document text
    • http://fqcycpa.com/jingkelun/userfiles/files/20210612215029.pdfIn PDF document text
    • https://condominiobrisasdelnorte.com/userfiles/file/gotetizivup.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/11097282884.pdfIn PDF document text
    • https://mzr-avocats.com/buddha/ckfinder/userfiles/files/26496876078.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/saduwopekepo.pdfIn PDF document text
    • https://jackyrouxmethode.com/userfiles/file/kupebabewinulavazelase.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/tgcccnjl6vjnd54eirj3bc7npj/notewirijebalo.pdfIn PDF document text
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/05971b4202841a6b4cdac855f12e93bb/ragupigozip.pdfIn PDF document text
    • http://smepil.com/ckeditor/userfiles/files/detufevepegirowa.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160cf438cb0ba3---51770736641.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c84ebbe7129---53637880517.pdfIn PDF document text
    • http://rubensova16.cz/files/file/40103850726.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/de15e748eca0e9608934ceba520e99fc/mavigos.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/858df7d92d5feae41bedffc47cf8ad9f/12257653047.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083405b81ae6---32462400574.pdfIn PDF document text
    • http://gzky.cn/dubeite/ckfinder/userfiles/files/20210723_022159.pdfIn PDF document text
    • https://angkaganjil.com/contents//files/83560858907.pdfIn PDF document text
    • http://fly.no1-yes.com/userfiles/file/1284267907.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=adjective+clause+examples+with+answers+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_off0000ed70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED70 11232 bytes
SHA-256: 13ee783744b4b82b7c396b1d9adc6d4483722ff024663fd5777f76ceebb57658
font_01_sfnt_off00010798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10798 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011faa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FAA 17180 bytes
SHA-256: 17d40c836c662df05b0f8630a54542546dd0fef064e0214c0d63a70a679c1021

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