Malicious PDF — malware analysis report

Static analysis result for SHA-256 b83ecb810a9e3d2f…

MALICIOUS

PDF

162.2 KB Created: 2021-07-02 01:38:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b48b63a1f0eedba89f6fd3cbc31dbb6c SHA-1: 93cfe1e0e1fceb87c3c36ab97d797c8afa460d81 SHA-256: b83ecb810a9e3d2f1e29f0cb3a3b61b89580ba14560266c9a775e869c8250443
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous external URIs pointing to compromised WordPress sites. These links likely serve as a lure to redirect users to malicious content or facilitate further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9903

Heuristics 6

  • 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.
  • 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://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/df69cca99c3845e161d38fbfcf8607d7/28120131389.pdf
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ba6113d5a---luziruxenuf.pdf
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/0a4d73955c4de022f1d9ea6b62e91d40/lemaxipel.pdf
    • https://trellisdundee.com/wp-content/plugins/super-forms/uploads/php/files/fa95038f4437a55b69e597047c4a00c6/nuvupajilurexizujepe.pdf
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/f9e1u89ddsqj938qmc7ctkr77b/pikeretalataloredexule.pdf
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/mereligaxuterugoro.pdf
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/4b69b65fc3fb49e791b91c339fef11ce/nivufigokasevoba.pdf
    • http://goldartline.ua/userfiles/file/79350157815.pdf
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/17f7021ec0b1b745c806bac83e8c7ee1/foboxolegu.pdf
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/suvikajesekodopibukil.pdf
    • https://bmat.mn/uploads/ckfinder/files/josakutopu.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5d0405502---4079471966.pdf
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3b7a9bc0e---25483697234.pdf
    • https://clubslotalmatriche.com/calcas/file/jatala.pdf
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/5fb9d33600990293de688cec733a6c62/maroloran.pdf
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/8b4e983f4dffbd7eea309b97cfdd12b4/50725912266.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/1pp96ooddo6fjgvd536f33uktl/94729483381.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ba77ca63aa2---85792106118.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609003c512389---razikifuso.pdf
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/f776f1bab7183b037072d0b7bcfa6474/87918018231.pdf
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084ebf7326fe---38644832321.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16084a898902ae---nesewabiwopufoxigejabumi.pdf
    • http://vietthanhstone.com/images/news/file/68227594177.pdf
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607831ecbb940---19918529869.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=brazzers+story+movies
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00021bf8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x21BF8 16792 bytes
font_01_sfnt_off0002340f.bin
eb1a0cf5c244ac449a121d6a4b66a293a465ec5e5c646b21205772c48a6b9a98		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2340F 10412 bytes
font_02_sfnt_off00024bd2.bin
b68b905692ec12854e7b48512ed904fb1343d67f7631e2dbfc557b1d39e413fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x24BD2 18508 bytes

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