Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba2164186e936c72…

MALICIOUS

PDF

80.5 KB Created: 2021-09-20 05:16:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 61a3c21b1b8c657b38f68e24ba4f7971 SHA-1: 8de73c285a806462d7583e1caeb2d6933fddcc11 SHA-256: ba2164186e936c72b2ecc66be78c245ba6ab8118cc22330eb54190ff706cf7be
196 Risk Score

Malware Insights

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

The sample is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of a browser extension installation lure. The PDF contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution scheme. While no scripts were directly extracted, the nature of the lure and the presence of external links indicate an attempt to exploit the user's trust to download and execute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://nomylo.ru/uplcv?utm_term=tethering+definition+computer PDF link annotation
    • http://odessawa.com/userfiles/file/lisibowaseseladibitikuw.pdfIn PDF document text
    • http://thuaphatlailongthanh.vn/upload/contentFile/minhchau/file/75209445702.pdfIn PDF document text
    • http://quiltingacademy.net/fckeditor/userfiles/file/39836800965.pdfIn PDF document text
    • https://doxity.ro/ckfinder/userfiles/files/30320238789.pdfIn PDF document text
    • https://stl-log.com/htdocs/cljr/data/files/15094827548.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/1jm9cr7kt527jnc65g4dsg4237/gitovive.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161348e67ce981---45630608182.pdfIn PDF document text
    • https://ratodua.com/contents/files/65029374430.pdfIn PDF document text
    • http://afro-safari.com/upload/files/5383308877.pdfIn PDF document text
    • https://ispartaorganizasyon.com/ckfinder/upload/files/7283608995.pdfIn PDF document text
    • http://floridadressyourhome.com/uploaded_files/userfiles/files/segusutozafumim.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/39097671652.pdfIn PDF document text
    • https://newegys.egyseg.eu/ckfinder/userfiles/files/zivebil.pdfIn PDF document text
    • http://stamforgtechnologies.com/uploads/kuxaxodoremekakifizu.pdfIn PDF document text
    • http://fredericjean.net/oplusco/file/87115475097.pdfIn PDF document text
    • https://clinicscrm.com/img/files/lidilaxisobovewevudizatam.pdfIn PDF document text
    • http://smsgurugram.com/miet/assets/files/89266140508.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/guxigukegesejobujowuleti.pdfIn PDF document text
    • http://cpils.com/userfiles/file/349374485.pdfIn PDF document text
    • http://xn--rssx31a7tec6p.com/upload/userfiles/files/20210910071732.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf1417103d---pulasa.pdfIn PDF document text
    • http://brenderup.ro/mm/file/17959379785.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/50533966174.pdfIn PDF document text
    • https://thietbigas.net/media/files/73692671785.pdfIn PDF document text
    • 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_off0000d6ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eebd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBD 17668 bytes
SHA-256: 1871ecb55e4c9285ed43481ce91f138d671faebc745b907b6cddfe9c559ee4c7
font_02_sfnt_off00011c44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C44 10752 bytes
SHA-256: 521dacc591e50b1734060e422a83360431a6fb38e18b1c3c28539eda38f5d9fd

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