Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4b1ebdbbf4cf41a…

MALICIOUS

PDF

76.8 KB Created: 2021-10-03 15:12:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ffdb40a1c0d2ee362942c01692fb443f SHA-1: 37b5d4f4e5f53d1f508acbe89fbe8caf7f898bce SHA-256: d4b1ebdbbf4cf41a4f9bfcef5fd7d0e825bbf4a0adf5e4e89806dbb65b443837
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains an embedded JavaScript stream and a large number of external URIs, many of which point to compromised WordPress upload directories or disposable hosting. The primary function appears to be acting as a link farm, likely to distribute phishing content or further malware payloads. No specific family could be identified, but the techniques suggest a phishing or downloader campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://dewalt-naradi.cz/media/upload/editor/file/82346038583.pdf In PDF document text
    • https://demircanticaret.com/userfiles/file/57424345955.pdfIn PDF document text
    • http://elektro-galerie-hamburg.de/userfiles/file/21396698067.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1613a8b09d4ac1---nipalilozusazoxune.pdfIn PDF document text
    • http://rlponder.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pipokomixemazujonoraf.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/66272224132.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/16147cfefb430b---wisigazum.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/161448313e2909---3456714495.pdfIn PDF document text
    • https://chandrakantmusicacademy.org/ckfinder/userfiles/files/82515771587.pdfIn PDF document text
    • https://mt-creativestudio.com/ckfinder/userfiles/files/suzasesesikupemakipan.pdfIn PDF document text
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/6252750704.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/357b06c4186067f3e184cb7a7f328fd1/dawamitavonuvoja.pdfIn PDF document text
    • http://www.tramag.pl/upload/file/94184834913.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/50087041574.pdfIn PDF document text
    • https://qualitygums.com/userfiles/file/womule.pdfIn PDF document text
    • http://doradcyprawni.com/images/pliki/waguvigifedi.pdfIn PDF document text
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/nudizegababolexipedoz.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615956c04ab97---73411298569.pdfIn PDF document text
    • http://maginsaatmetal.com/resimlerfiles/lukinogo.pdfIn PDF document text
    • http://piannocreativo.com/js/new/fckeditor/userfiles/file/puxexisovot.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/30664208457.pdfIn PDF document text
    • http://sakulchaiplace.com/Uploads/file/givugilat.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f94cbaf29e---sokidaxojesojikonureduzum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=photos+that+need+retouchingPDF 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_off0000c1d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1D9 19920 bytes
SHA-256: 4fa399cb08a25669cefdc12ff943ec318e410306eb9e38dc4ea87884e01cd2e2
font_01_sfnt_off0000f593.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF593 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010daa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DAA 10704 bytes
SHA-256: 650a1f74cfda7d92532fc67676ca71aea267470df1b0e9a633de450f65ed00b8

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