Malicious PDF — malware analysis report

Static analysis result for SHA-256 e635b6829d0f97d6…

MALICIOUS

PDF

68.4 KB Created: 2021-09-29 03:32:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 04ef84269084c125ffe369a3da748cab SHA-1: cef70604e03c3e30b758fc5302cf7b2e12f8d36a SHA-256: e635b6829d0f97d6f1363df4c5116cd4f96184e8722ff5118f9d83ff2c07ec4e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or SEO manipulation attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://chcial.ru/uplcv?utm_term=delete+internet+history+android+phone PDF link annotation
    • https://chambres-lannion.fr/userfiles/file/wivivakogaxura.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16153b2211482a---1665325255.pdfIn PDF document text
    • http://dichvugiayphep.biz/upload/ck/files/65243769165.pdfIn PDF document text
    • http://chingyi.tw/userfiles/files/58891432167.pdfIn PDF document text
    • http://hamlineparkplaza.com/assets/amund/ckfinder/userfiles/files/vosibakof.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/92861600169.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/sijusedikisop.pdfIn PDF document text
    • http://lsneotek.com/ckupload/files/tenimokasulolufim.pdfIn PDF document text
    • https://northcoteplaza.com/userfiles/file/43334452703.pdfIn PDF document text
    • https://sinarwaja.com/account/files/5264170513.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614c1b5110f50---majelugilakufesotod.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/161348865531d0---74423888762.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/fanogonovatixalufotine.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134deb35c56d---92413822860.pdfIn PDF document text
    • http://fu-xin.tw/uploads/files/202109230315327015.pdfIn PDF document text
    • https://perfecthospital.org/ckfinder/userfiles/files/88238368706.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149984cdd8d7---65587270771.pdfIn PDF document text
    • https://www.asoriofrio.org/ckfinder/userfiles/files/vugulokiwo.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133709272033---wubejapenidituzidot.pdfIn PDF document text
    • https://adikkeempat.com/contents/files/navotanujif.pdfIn PDF document text
    • http://101-games.ru/images/uploads/files/jojudadudogin.pdfIn PDF document text
    • http://elektromig.pl/userfiles/file/zuguzusasurelora.pdfIn PDF document text
    • http://peaceinsrilanka.lk/ckfinder/userfiles/files/60371630581.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/vonifulofalezufotis.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_off0000af4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF4E 14500 bytes
SHA-256: 7c35eb7af8810f6562b03c56d98bd27cb900e857bdc90fabf9b8a5e34c467fa6
font_01_sfnt_off0000d3b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ebc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC9 10604 bytes
SHA-256: 69afa4d78cc78c6213e98437a3c7d1c71d209b669e0fdcec68c7ee59452f0d09

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