Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddf678aca31aa60e…

MALICIOUS

PDF

80.1 KB Created: 2021-09-01 04:20:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 90accf1029aebc40fcdc4dfcb8c85aea SHA-1: 97e4a995047441bd07a5c3728584c26aa54421bd SHA-256: ddf678aca31aa60e1706bd9a708af8aa0f6115dd3b9798e6533c7cefd5daa298
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The document contains a large number of embedded URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate attempt to create a link farm for SEO manipulation or to host malicious content on seemingly legitimate but compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://wastran.ru/uplcv?utm_term=foundations+of+inventory+management+pdf PDF link annotation
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/160b9fde963ccdef84e8c4808d1dfffd/buwuxexikuwupike.pdfIn PDF document text
    • https://coaching-jk-academic.com/ckfinder/userfiles/files/73800088151.pdfIn PDF document text
    • https://biovuspharma.net/userfiles/files/rowonapodebepomo.pdfIn PDF document text
    • http://palenice.net/obrazky_clanky/file/53804081727.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210523194854.pdfIn PDF document text
    • http://cdmatik.com/uploads/file/59797499661.pdfIn PDF document text
    • http://ledson.ru/upload_picture/77491220588.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/42c400e16c1edb0ef88b2253e28b909e/49042774736.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a32ad6e8507---2210135975.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d881e6e3414---72339501423.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/o911dl2munsmpva4ptpojulehl/49150209379.pdfIn PDF document text
    • http://industra.sk/userfiles/file/69362933813.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/83199598983.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609d2a32541e2---juwajinigitedu.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/77970686460.pdfIn PDF document text
    • http://springswellness.net/wp-content/plugins/formcraft/file-upload/server/content/files/16076d06f7f997---dedigodaborupofasa.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/5db04763dcad686f6cfa0858e4996cf2/nutimutosizolenomitirozed.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/68218357743.pdfIn PDF document text
    • http://gamjagolla.com/uploads/files/relasel.pdfIn PDF document text
    • https://manajrgvaaradhi.com/cms-uploads/files/memavizuvifu.pdfIn PDF document text
    • http://mayjack.com/upload/files/5217613613.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160714bd249c3c---tajexibakud.pdfIn PDF document text
    • http://uktohabbarijamalta.com/files/file/4962202706.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_off0000d472.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD472 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC84 17196 bytes
SHA-256: 016fc5125dace39395e3ecbccb0db659d0ed6e23932c1e71d7c48369937020b8
font_02_sfnt_off000118ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118ED 11052 bytes
SHA-256: 918e2e3ffe18726da1abe72fd66e57e52754ef4c49e2e3f6bfb75279e4ce2056

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