Malicious PDF — malware analysis report

Static analysis result for SHA-256 378ad9d19db36a01…

MALICIOUS

PDF

88.4 KB Created: 2021-07-14 00:59:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ad408a62410a48d0ad353d8034739bc9 SHA-1: ad28567c7d04482a2eb4f138a62273ba4975025b SHA-256: 378ad9d19db36a010d1190b3aea2bff0f2a782f1df0351f4bbbcc2849b4a345b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many of which point to compromised CMS upload storage and disposable hosting, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL patterns indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9765

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://prplus4u.com/ckupload/files/77611099774.pdf In PDF document text
    • http://aliglobshop.com/userfiles/file/totanizeturu.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/83704cd49e33fc728304247e3f84cf78/wepujavujivesanarogozux.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/ab8cb981778747d8e1044c600614e22c/80333821737.pdfIn PDF document text
    • http://navigator-33.ru/media/file/bevakosubapol.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/n3gojp0oujubsh5vameqi81bts/pufibewosutawapugusatumob.pdfIn PDF document text
    • https://xigmatek.com/upload/files/62999806601.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609319bdcfb63---19154994896.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160940d90e35a8---1574538862.pdfIn PDF document text
    • https://prairieroseclothiers.com/FCKeditor/file/762921535.pdfIn PDF document text
    • http://penzionklara.cz/userfiles/file/71691761711.pdfIn PDF document text
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/7d346a642ddfd8c2ec9b3b8841787b32/purekelizepisidununurex.pdfIn PDF document text
    • http://shipagents.nl/uploadfiles/file/vuximor.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/1c922332d66eb64aab8d5d1204757957/47397633248.pdfIn PDF document text
    • http://terralindahigh1981.com/clients/866868/File/jidopalor.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/99686abc203dff49d4831701d2369ae8/bekipufivifotoza.pdfIn PDF document text
    • http://www.dismaplant.com/ckfinder/userfiles/files/zumuwani.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/cf8a71c76379e645a44ebf9b4d7b6be2/zoralogomevanoxitiborino.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/krr28olm1viud3rd7r7n5lcfe4/93954705300.pdfIn PDF document text
    • http://architettotoma.it/userfiles/files/69275442563.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/7f5396927766a94db34b1ccd45ea3749/63703857095.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606c77309ee8c---70521596924.pdfIn PDF document text
    • http://kruengrangthai.com/files/files/zegozodas.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/zewufizuvobaref.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/b92be227ee0be5c41228c2bf9ecb0c5d/wixowikasofofe.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/dofumovogutugodova.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=bsc+final+year+syllabus+zoologyPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD6 10880 bytes
SHA-256: 671c2268e6912f6f09d6d988500f882afc42e8d4a7492af9b60aa205a02a2ebf
font_01_sfnt_off0000f936.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF936 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011147.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11147 16228 bytes
SHA-256: 2580885c9e079f36da03afb78f613eec7ddb6533de3face93d8160cad2231324
font_03_sfnt_off00012724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12724 16492 bytes
SHA-256: 5bef08e03ee38a8a69c4232071a59c1e1a43f43518ff37d17d5da1abea7dc708

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