Malicious PDF — malware analysis report

Static analysis result for SHA-256 c67b05df92ea0b51…

MALICIOUS

PDF

81.6 KB Created: 2021-09-21 08:50:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 3a36f82ead382225e77f69d426c1b93f SHA-1: f18fc4865114c34bdff538af9b3f9c30814b2a7a SHA-256: c67b05df92ea0b512d498c40f66703f0a14fd104599b5bdb9bb0d545d3435690
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous external URIs and links to disposable hosting, indicative of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple compromised CMS upload links further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://crewmak.ru/uplcv?utm_term=sd+ninja+hero+apk PDF link annotation
    • https://ndmoyun.com/calisma2/files/uploads/kamepelokejirufa.pdfIn PDF document text
    • http://zxpgw.com/userfiles/file/mixivazebuzemes.pdfIn PDF document text
    • http://katachizu.com/img/news/files/makuxebovofikavaruwoke.pdfIn PDF document text
    • http://france-ex.com/images/blog/file/4338956419.pdfIn PDF document text
    • http://diegogenna.it/userfiles/files/73647283413.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1613f90495c063---doxelubume.pdfIn PDF document text
    • http://zafirkort.com/uploads/files/jebigizasifofoxuj.pdfIn PDF document text
    • http://boldogelet.hu/media/11502959753.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/81687224041.pdfIn PDF document text
    • https://webkapper.nl/ckfinder/userfiles/files/nobapizi.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16147f6f48f7a3---57605389780.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/9d47f673b8af387790026b190d08bae5/18137097731.pdfIn PDF document text
    • https://sharks-cz.cz/images/file/zerurefu.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202109101644488239.pdfIn PDF document text
    • http://perfect-gallery.com/userfiles/file/53176252346.pdfIn PDF document text
    • http://www.startservis.sk/novy/ckfinder/userfiles/files/84220796224.pdfIn PDF document text
    • http://pttaccounting.com/userfiles/files/tixulolave.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/63774360339.pdfIn PDF document text
    • https://akilanews.com/ckfinder/userfiles/files/xixomexaxeloni.pdfIn PDF document text
    • http://www.examnotice.in/uploads/files/tuxufililexuloxuve.pdfIn PDF document text
    • http://cauthangdep24h.com/upload/files/80557870018.pdfIn PDF document text
    • http://aokunoil.com/ckfinder/userfiles/files/82834281894.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_off0000dc74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC74 17372 bytes
SHA-256: 6baa1f65b38b35ae2238ad66caafcf1252965cf921378c14b581d1fc20794f87
font_01_sfnt_off0001095d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1095D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12174 10476 bytes
SHA-256: c338d21aa805e0bf88d2f31ab3af7cf30ee3d9df136f12b0ddb50fa3aa21d1c2