Malicious PDF — malware analysis report

Static analysis result for SHA-256 db65986815c84b9c…

MALICIOUS

PDF

75.5 KB Created: 2021-09-18 17:34:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 14c90f067e2c5c87e14162f29c8213ed SHA-1: 61072f1cfaa14e71e12ddaab8b3d32ad10e8a31b SHA-256: db65986815c84b9c55a4691b1d3a3dcf093a570d1a17b236cd3b50ea8e70aca8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and a machine learning classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://archism.ru/uplcv?utm_term=ewallet+android+sync PDF link annotation
    • https://artlabjo.com/userfiles/file/nalezivawabebeve.pdfIn PDF document text
    • http://belloverde.net/emailer/file/tazidam.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/79976338713.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/e0a02795cead3fa911cda5a7816bbd9d/limepagalubixekim.pdfIn PDF document text
    • http://musicpark-live.de/userfiles/file/jasiwiw.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145aae4ca1a1---1948829596.pdfIn PDF document text
    • http://scea.edu.mn/ckfinder/userfiles/files/88872370022.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613dccb30c306---944865922.pdfIn PDF document text
    • http://imapbook.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/23164697520.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/046f91d40bf42580e834dff6afcfae94/10477515776.pdfIn PDF document text
    • http://unite-chem.cn/upload/files/xawusewikuzaru.pdfIn PDF document text
    • https://nadrozmerne-sklo.cz/uploads/77727456650.pdfIn PDF document text
    • http://unicaconsultoriarh.com/images/files/33469795607.pdfIn PDF document text
    • http://fuyu.010bi.com/ckfinder/userfiles/files/61637902236.pdfIn PDF document text
    • http://www.performhabitat.fr/bundles/astadmin/js/ckfinder/userfiles/files/dusap.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/62998204589.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144f8a61b8df---71720990492.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/86315714423.pdfIn PDF document text
    • https://muacash.com/webroot/img/files/24742910151.pdfIn PDF document text
    • http://studiosiciliani.eu/userfiles/files/tipalafatazon.pdfIn PDF document text
    • https://fivetc.vn/uploads/files/92234566281.pdfIn PDF document text
    • https://artcorner-fiberglass.com/userfiles/files/texudijokapag.pdfIn PDF document text
    • http://volvo-cars.jp/js/upload/files/wezorakelotuvov.pdfIn PDF document text
    • https://thefertilizergranulator.com/d/files/tapuzakikamiwukoraru.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/68747984643.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_off0000c43c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC43C 17032 bytes
SHA-256: 7841d52f3effa9401e5f695e4baf28862b57dcf161b1c25497cb4b19978c0139
font_01_sfnt_off0000f04e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF04E 10548 bytes
SHA-256: d137e2b60d7a277c952d43e607feea5a44fffed437acf3112292e0c15a1a48ed
font_02_sfnt_off00010886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10886 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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