Malicious PDF — malware analysis report

Static analysis result for SHA-256 0943c5dbcd98f469…

MALICIOUS

PDF

88.1 KB Created: 2021-08-03 18:14:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 54533eac4829fad7f19d3f72e0f3e933 SHA-1: 21d5941121cbeead8b54e417d6d7012c0b54edda SHA-256: 0943c5dbcd98f46900a1ae068553d4bac002818325551b05deccb2c0977f820d
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious, containing embedded JavaScript. It presents a lure of an invoice or payment, with multiple links pointing to potentially compromised WordPress upload directories and other disposable hosting, suggesting an attempt to deliver a second-stage payload. The embedded JavaScript is likely responsible for initiating the download or redirection to the malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 9

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.amanuttarakhand.org/ckfinder/userfiles/files/12040530659.pdf In PDF document text
    • https://midasspa.com/ckfinder/userfiles/files/venukuwupusokug.pdfIn PDF document text
    • https://fallahi-sch.com/userfiles/file/pagit.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/1b374c5ec8aa9ffb02a66d090452c484/wubetuwavexumorewil.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/pisetelekexa.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/vigerur.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af969cd4e7f---293708231.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/cf0457e93ac9b960555c58b8ffd029fe/zagefuloxiwi.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609e289824be9---nusexunavuja.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070b25a45837---19209318527.pdfIn PDF document text
    • http://maxidmum.com/images/upload/fck/file/51210241331.pdfIn PDF document text
    • https://jollytime.ru/wp-content/plugins/super-forms/uploads/php/files/640000dfcfe8afddab0db52b2776ae37/dokitedoxifikemajekebi.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1607875fb5795b---joxixofifefoviru.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160896ea3343f5---6474978179.pdfIn PDF document text
    • https://www.wflorlando.com/wp-content/plugins/super-forms/uploads/php/files/43b125111e102c25c35ead95ca7f2a08/81370407022.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160916869434ae---befojut.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae2521bcaaa---92890611432.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a71162afaf6---11558661057.pdfIn PDF document text
    • http://luisacortesearchitetto.it/userfiles/files/57831540192.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/80uu4chdmnahdshelvq07v8vu5/jalesuj.pdfIn PDF document text
    • http://www.kammerpop.de/files/file/50548646098.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/n4ksc9qti5no9e9m9cgkov7k4i/14128420231.pdfIn PDF document text
    • http://dtcguild.org/clients/80367/File/224775599.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///7054225485.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=petty+cash+template+excelPDF 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_off0000f4a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4A3 17112 bytes
SHA-256: 7cd7645375f3783032aec9e866163e51f95764d557f5c03ed4457902abcf3f62
font_01_sfnt_off00012166.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12166 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001397d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1397D 10440 bytes
SHA-256: c0013989215120cdeeae0eb1a559113d7c405ae00f9a0e250a9614c7f1499408

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