Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dc1ea1294e27bbc…

MALICIOUS

PDF

70.9 KB Created: 2021-09-02 06:58:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6c10a2e4e22d826c8a1ad6869fc67a5c SHA-1: bcc2d2478710bbd3a6a918d9169678b5346da737 SHA-256: 4dc1ea1294e27bbca7206a52b0faacb3b65a00fce03578221e7af8b632a4bdfd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users. Several heuristics indicate the PDF acts as a link farm, pointing to compromised WordPress uploads and other disposable hosting, suggesting an attempt to distribute further malicious content or phish for information. The presence of embedded JavaScript points to the T1059.007 (JavaScript) technique, and the overall nature of the file suggests it was likely delivered as a spearphishing attachment (T1566.001).

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • 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 https://alves.bg/ckfinder/userfiles/files/beboluzazofogixiva.pdf In PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160efffdb62378---fonet.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/nowawozatebaxoj.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b140d3b7dac---1376403862.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/52deef5f8c7ec03664cc5347fc773206/seguvijufobovenugebu.pdfIn PDF document text
    • http://linza-market.ru/upload/files/71205434724.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/5db80cebbe9b6c54b6479bc409fb5357/ledatomezaxef.pdfIn PDF document text
    • http://churchtextile.com/userfiles/file/17197616714.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/161050bfb02517---jexuboxogubasudasiragopef.pdfIn PDF document text
    • http://lica-mpt.it/userfiles/files/4056473385.pdfIn PDF document text
    • https://solucionaesp.com/ckfinder/userfiles/files/dowepevozodixosaxu.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/848b613a9c065173733971eda522e66c/fovezatopexejulagipare.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/12816876252.pdfIn PDF document text
    • https://dodatnagarancija.com/userfiles/file/wajesokalulivefalas.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/f6ccebfb5866d17a7fc67f40b834d527/61862427406.pdfIn PDF document text
    • https://europawindow.com/app/webroot/img/main_content/files/xafemosan.pdfIn PDF document text
    • https://gwynharmon.com/home/gwyn/public_html/ckfinder/userfiles/files/83369117503.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160efda9c3e199---60158612271.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/78f0i1kei6th13o902uj59jbr2/fikajitegige.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/dd47d8904091c37acf4c6e0944d51844/1049604627.pdfIn PDF document text
    • http://aviapartner.biz/js/ckfinder/userfiles/files/56953381298.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/79514300469.pdfIn PDF document text
    • http://thesetnews.com/images/fckeditor/file/16720786076.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/bodilapotegidedenigoman.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=the+governor+bradford+provincetownPDF 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_off0000b842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB842 10940 bytes
SHA-256: efe773ba3bc37119ae458304d6d95a0d1fbb56a440a06b71a60687ba682042e9
font_01_sfnt_off0000d133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD133 14488 bytes
SHA-256: 79fbc675ad0ba7139f854b329b62af1dd72360efd992f4363a6bffae647f0462
font_02_sfnt_off0000f550.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF550 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1