Malicious PDF — malware analysis report

Static analysis result for SHA-256 68290aa9e7981e7e…

MALICIOUS

PDF

82.6 KB Created: 2021-09-08 03:47:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 7791622a76449886508c0c1da96ddd41 SHA-1: f948a3259eb2f7a2dbeabc45c3eec66f57472d22 SHA-256: 68290aa9e7981e7e8c8bb0439830a687c8683e6c2dc0f5c2d4658156e6ba59b8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a large number of external links, many of which point to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution campaign. The embedded JavaScript is likely used to facilitate the redirection or download of malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://infrive.ru/uplcv?utm_term=litanies+%C3%A0+la+vierge+noire+pdf PDF link annotation
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a64cb56ba75---tebotidupamaxuf.pdfIn PDF document text
    • http://sh-ruiyangcpa.com/userfiles/file/2021-7///2021771356281890.pdfIn PDF document text
    • http://kaizenlife.com/ckfinder/userfiles/files/wetad.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/1bc104d620ea0fe4da2cffa4ecc4dc90/98928369467.pdfIn PDF document text
    • http://jewfri.kr/files/image/files/17441661062.pdfIn PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/fegiliwugopubadujix.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608767dc2d410---kugas.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/mufuweruxapuvefilelujanup.pdfIn PDF document text
    • http://auchli-appenzeller.ch/userfiles/files/xekovuz.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e521a085f8a---28616852413.pdfIn PDF document text
    • http://yoga-privates.com/yoga-privates/file/87344144662.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/lomikudiz.pdfIn PDF document text
    • https://jaukiaplinka.lt/ckfinder/userfiles/files/webobumew.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/9q8j16sd9frnenimhffsn6sh16/ziwoworidiraredizofabu.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607127939c1d3.pdfIn PDF document text
    • https://noelex22.org/userfiles/file/wikewofitibugigax.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/defaxadajopatepopujavul.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d52f92a19---xaxap.pdfIn PDF document text
    • http://obkladacstvikolar.com/content/13054050454.pdfIn PDF document text
    • http://whalesart.com/uploadfile/file///2021061920135182.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/f8be29b85bfbbd34639ff65cf243ddd7/nibonib.pdfIn PDF document text
    • http://setadijital.com/img/userfiles/files/kinebodivorizolinexun.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_off0000d53b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD53B 10880 bytes
SHA-256: 3bade06df5000fc7d7c4a53988e4588ef59eb4acfc449d898266c32058e23fbb
font_01_sfnt_off0000edea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEA 21700 bytes
SHA-256: 621cb2d7a10858d7fa34f462a2762231f1fadf149def7252ab00bdce7416c5d1
font_02_sfnt_off000122d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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