Malicious PDF — malware analysis report

Static analysis result for SHA-256 fad87d24caed68ec…

MALICIOUS

PDF

85.0 KB Created: 2021-08-18 16:21:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 67909cb435cee0a3b13cdbb8174048c4 SHA-1: 2ca359f040f34ef8c02c9129b43b836090eca963 SHA-256: fad87d24caed68ec8e672985d687d247b461ff8fa27f12472bab67f8dd3e85be
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, many hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the exploitation of PDF vulnerabilities to execute code or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://garglob.ru/uplcv?utm_term=sejda+pdf+editor PDF link annotation
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/7b1a025c308b6cd3e28fecb9f9485c5a/bisexenikemadi.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021080700292722.pdfIn PDF document text
    • http://herbwaterthailand.com/userfiles/files/2913428572.pdfIn PDF document text
    • http://simonide.org/userfiles/file/wixidesuji.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/topiwavarafaxesotigamobu.pdfIn PDF document text
    • https://orrizon.ru/images/file/komiminedevebololumiwu.pdfIn PDF document text
    • http://ssaisarang.com/ckfinder/userfiles/files/28609600043.pdfIn PDF document text
    • http://beergolfers.com/blog/images/file/gamutakuniwi.pdfIn PDF document text
    • https://delaneyllc.com/ckfinder/userfiles/files/94404954087.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/29911519596.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/ac42010e09a5addfa4c0b66025165a28/nifos.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/868303e1e561ec29f9d22e6393365664/3037850404.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16082a78e08e0b---98221542585.pdfIn PDF document text
    • https://peilimineko.com/userfiles/file/miwasajolixulapuxu.pdfIn PDF document text
    • http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/85171086418.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609091f21d886---xidivobekidabo.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/5374118225.pdfIn PDF document text
    • http://www.ks-klinika.ru/ckfinder/userfiles/files/webitinuzomawagedag.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d9c05576f54---67002717436.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/qrdj6mpc7rg8nqq29ms1n1cnbi/66408575805.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/a471pdsumt6hu2mmr6ip49h79g/xebomutuwoniligadis.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210618040925972529614.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160e64af387650---59815292183.pdfIn PDF document text
    • http://interfacetravels.com/app/webroot/js/ckfinder/userfiles/files/bobivotexamividunowuvodaw.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/41238c864f887578292ed913f6e23d6e/nirudigef.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_off0000eb87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001039e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1039E 10376 bytes
SHA-256: a6c79bc12d458760a262f01f12a47d420536c82bc15639a0842deff2b1906980
font_02_sfnt_off00011b2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B2A 16632 bytes
SHA-256: cb6c1b6d1720dbaaebe99d6f05025a42a76ba5d1263d33f7bd22305cd9e65b50