Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc6b2500d395aa73…

MALICIOUS

PDF

72.7 KB Created: 2021-10-04 01:02:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: fcbaf93728a97612fd8d060212346854 SHA-1: 6c9563da2417c2f2e5b5bd373eb4c27c6700eed2 SHA-256: dc6b2500d395aa734006067344544dbaa6837448ea7d1f048d4d13b57987e0cd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a significant number of links pointing to compromised websites, suggesting a phishing or content-distribution lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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://pistant.ru/uplcv?utm_term=red+to+ash+brown PDF link annotation
    • http://abwpetersburg.com/uploads/files/28707499855.pdfIn PDF document text
    • http://apex-architect.ru/images/file/welojerofepibof.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/23945076636.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/37eig11pauu48k8rieeh1sjfde/46380544393.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/87599608074.pdfIn PDF document text
    • http://gdfsztal.com/uploadfile/files/gubunipojapekaninuwowizu.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/ea6bcc238e1794ec1595dfac51b9d8e5/8124228421.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/1642214993.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/bedakezugewufokes.pdfIn PDF document text
    • https://rosycaffe.com/file/famikabat.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210914_B072E131829DE46B.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c482e6cc13---kipipusumofileg.pdfIn PDF document text
    • http://gmicropilotes.com/uploads/files/parux.pdfIn PDF document text
    • http://flapboxes.com/userfiles/files/doxoporixuvewexirawejob.pdfIn PDF document text
    • https://taybaite.com/userfiles/file/45770575565.pdfIn PDF document text
    • http://shinhwajudan.com/userData/board/file/83606523988.pdfIn PDF document text
    • http://purplebyanki-com.bvirani.com/ckfinder/userfiles/files/71161505279.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/1qo09j9bo1pntu82v7gfi4gppi/geligidala.pdfIn PDF document text
    • http://lianbang123.com/uploads/files/202109170521185784.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/defidogitiradizisusitov.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/49372546335.pdfIn PDF document text
    • http://redagowanieprac.net/Upload/file/zaxum.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1614f73bc8c031---37664837316.pdfIn PDF document text
    • http://m-styleauto.com/js/upload/files/robopepijokiwotowajobu.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/576dc9c8672eccd1958f52305a836aa5/zofolepadok.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/98dc0302eea96ebc21c4acf383c1efd4/31653259264.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_off0000b806.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB806 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD018 17804 bytes
SHA-256: b68ac1f46045cabea84abf80ab714439585317cab6ce6d35ad994f29d02cdd67
font_02_sfnt_off0000fd54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD54 10480 bytes
SHA-256: 367aada0357834db1dc3d3b115aee8eb21aea11f39b5518e59abb11ae1c8407d

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