Malicious PDF — malware analysis report

Static analysis result for SHA-256 981bb2c9fd235406…

MALICIOUS

PDF

89.1 KB Created: 2021-09-12 15:50:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1fb7746d0411993853ec2b87e6df4572 SHA-1: f839e9a657669428b753670a9862b788d87f3a3f SHA-256: 981bb2c9fd2354063c9fba7272634a27af4c36aebb69b1d0b00cb866f4ff855e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. ClamAV detection and ML classification strongly suggest malicious intent, likely phishing or malware delivery. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crysiq.ru/uplcv?utm_term=wavelengths+of+the+visible+spectrum+are+between PDF link annotation
    • http://canadianartistic.com/userfiles/file/68920871613.pdfIn PDF document text
    • https://vcvscr.cz/www/www/fckphotos/file/mazexizikakimasemetav.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/tanuvumokimevidagarevasef.pdfIn PDF document text
    • https://ddnepal.com/assets/userfiles/files/pagujeposobi.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/gtbd5s3ugra1ub8n3ufdutv4dc/pewapuroro.pdfIn PDF document text
    • https://ukmalayalamnews.com/userfiles/file/rudufupaxurowax.pdfIn PDF document text
    • https://ringid.vn/ckfinder/userfiles/files/supuvubakamuvinex.pdfIn PDF document text
    • http://aeklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sipawul.pdfIn PDF document text
    • http://vitacanes.com/uploads/files/58333219016.pdfIn PDF document text
    • https://www.shamshabaddiocese.org/files/js/ckfinder/userfiles/files/54015232043.pdfIn PDF document text
    • https://cosmopolitanhotelbg.lastrada.bg/uploads/wysiwyg/files/81369600845.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613de6d050bc6---wurokemaxodet.pdfIn PDF document text
    • http://happyhanool.com/ckupload/files/dojesidokopozojaje.pdfIn PDF document text
    • http://alarcon-v.com/editor_upload_image/file/vusofuxaweg.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/40817146307.pdfIn PDF document text
    • http://digifast.cz/userfiles/95581824894.pdfIn PDF document text
    • http://autowagon.it/userfiles/files/namewetavivi.pdfIn PDF document text
    • https://marathonblainville.com/userfiles/files/senesugukovelimapevomisek.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/16138c4b9c3857---77945439219.pdfIn PDF document text
    • http://getrade.net/uploadfiles/file/korewa.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/6c3850b0ea46739872efdd2caedf9907/jetora.pdfIn PDF document text
    • https://www.jdconstinc.com/ckfinder/userfiles/files/wujelanudeguregaraxize.pdfIn PDF document text
    • http://liavanhaeringen.nl/userfiles/files/titomekemubotateroge.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_off0000f226.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF226 18960 bytes
SHA-256: 88a6d028fa9c7031055bce5a87b2b6f357b43d7b2959d92be9e0ea317e02c62b
font_01_sfnt_off00012409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12409 11312 bytes
SHA-256: 5aa18f76afc36324bbef531fd50d346112af08ce08ea6fb66f786ace2d50c1e1
font_02_sfnt_off00013e47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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