Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a4eacf1a842cd8e…

MALICIOUS

PDF

78.6 KB Created: 2021-09-13 09:23:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: a86826a2614c2cb7502f980e0d136ee1 SHA-1: 75877102bc6e9da739ef04217f3b094bc8f85211 SHA-256: 6a4eacf1a842cd8eb4ba790873217031f1f84cf1f2b471885cb009a44585f93d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded links are characteristic of a malicious document designed to lure users to external, potentially harmful, sites.

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://coretry.ru/uplcv?utm_term=kgf+movie+online PDF link annotation
    • http://zaiger.ru/img/file/zotebini.pdfIn PDF document text
    • http://expertcomptablecourreges.fr/michel_courreges/userfiles/file/pamufonotifokuwodarut.pdfIn PDF document text
    • http://uktohabbarijamalta.com/files/file/94230157784.pdfIn PDF document text
    • http://tc-muehlacker.de/data/tcmuehlacker/userfiles/file/piwilopusovurozego.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/wunafovasasoxofodanebuxe.pdfIn PDF document text
    • http://erulingua.hu/uploads/content_files/files/57245893572.pdfIn PDF document text
    • http://meuble-tunisie.com/userfiles/file/82481338871.pdfIn PDF document text
    • https://ymy-tea.tw/upload/files/83464086019.pdfIn PDF document text
    • http://acsalma.hu/userfiles/files/70252063456.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/6704976714.pdfIn PDF document text
    • https://semut73.com/contents/files/34446401126.pdfIn PDF document text
    • https://at2-turbo-j3t.com/contents/files/gatiterifad.pdfIn PDF document text
    • http://women-for-marriage.com/ckfinder/userfiles/files/84155532587.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/a90d45e43d254a70df37a60c1a71a2cd/69060039410.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/faxuli.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/vojusotitetelosowafoviw.pdfIn PDF document text
    • http://packamate.com/userfiles/76088456830.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eae5f5c244---86027445915.pdfIn PDF document text
    • http://aal.tw/uploads/htmlupload/files/70829148870.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/161382786a0ad0---98066269019.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/golopawi.pdfIn PDF document text
    • http://carrasvilla.es/uploads/files/49152887503.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_off0000d2ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2CA 10088 bytes
SHA-256: 1d4430a4687abd4979cb09b4928cb769c99fc6df01fe531b2b4d4416084c7e33
font_01_sfnt_off0000e937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE937 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010149.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10149 17188 bytes
SHA-256: 83b692a4d767e9697423aafecbd909547a75fbf16c7df5e04e7f9ad0ddf1659f