Malicious PDF — malware analysis report

Static analysis result for SHA-256 4af58ead22cd3db8…

MALICIOUS

PDF

85.8 KB Created: 2021-10-07 18:13:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 6b650de8b4d37fb111b750eb4b68d86e SHA-1: df5e4090521d26f1ec5b6346c479e434378f05cb SHA-256: 4af58ead22cd3db82d9e9d530cb0d3690208d4acc8a9810e2220c5b3a75e8ff5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress upload directories or disposable hosting. These links form a link farm designed to redirect users to further malicious PDF downloads, indicating a phishing or malware distribution attempt. The embedded JavaScript likely facilitates the redirection or download process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://svenskafik.se/uploads/fckeditor/file/10483407118.pdf In PDF document text
    • http://xlith.com/userfiles/files/86518729675.pdfIn PDF document text
    • http://bangiyaparishadtoronto.ca/bpt/editor/uploadfiles/wapexidufumag.pdfIn PDF document text
    • http://serextion2006.com/js/upload/files/xovojamofonowegawapori.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///tibofaxogulegigoli.pdfIn PDF document text
    • http://anpo.vn/upload/files/83134183010.pdfIn PDF document text
    • http://packamate.com/userfiles/wexanuduvufalojupe.pdfIn PDF document text
    • http://studiopedrazzini.eu/userfiles/files/67898715081.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/08b0fc1753288e8d78da83b6f00b258f/27210181539.pdfIn PDF document text
    • https://davidfoleyinc.com/userfiles/file/jibegonozekab.pdfIn PDF document text
    • https://petikdaun.com/contents/files/dovub.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/kazofe.pdfIn PDF document text
    • https://kysig.com/app/webroot/userfiles/files/kejotewelewopa.pdfIn PDF document text
    • http://www.biosafety.biz/ckfinder/userfiles/files/82472741328.pdfIn PDF document text
    • https://penmypoem.com/new/admin/uploadfiles/file/kelavu.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/rerelakaloxuni.pdfIn PDF document text
    • https://vitanov.rs/files/95320002018.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1614a379d2e25b---lakaregogelazim.pdfIn PDF document text
    • http://sov.tranovice.org/webpagebuilder/ckfinder/userfiles/files/90682644540.pdfIn PDF document text
    • http://iranjobex.com/cache/fck_files/file/lupol.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/16156525ab9b55---50570097799.pdfIn PDF document text
    • http://npi-management.fr/ressource/site-image/files/pakin.pdfIn PDF document text
    • http://xn----7sbicwad4afgcgd5aph7d5e.xn--p1ai/ckfinder/userfiles/files/95470940664.pdfIn PDF document text
    • https://tramincojp.com/uploads/news_file/83663587859.pdfIn PDF document text
    • http://zit-tech.com/userfiles/files/lugunuwofarajapuxufixav.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/77625984174.pdfIn PDF document text
    • http://esipro.lu/userfiles/file/ripojokil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=gone+with+the+wind+download+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_off0000e63c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE63C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fe4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE4E 19420 bytes
SHA-256: d5161768b83f2a5f5edf79b7f20eb8d0305420723983cdadc958e55f90654c03
font_02_sfnt_off000131c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131C8 10452 bytes
SHA-256: 9bd32d71128a5cbaa08b2f349c56e4ec9cab0d5747204689f120abe8d9535742