Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bd048dfb9573711…

MALICIOUS

PDF

81.4 KB Created: 2021-09-05 09:22:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cb400ab61ab85766ad530915b34ef5ed SHA-1: bf1f31e5837c7f131418b95c83c5dc33e0352cdf SHA-256: 4bd048dfb9573711b88f039b14a61acf83e17137463640ff7c1ca92a4f089a8c
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress upload directories, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://dermatologie-francophone.com/userfiles/file/40104455873.pdf In PDF document text
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c633cdbda21---xuwuvogiv.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160966e52960c2---6221753161.pdfIn PDF document text
    • https://fidelishospice.com/ckfinder/userfiles/files/wulujolatoliwobi.pdfIn PDF document text
    • https://www.db-ynox.fr/ckfinder/userfiles/files/sebonepime.pdfIn PDF document text
    • https://mytalk7.com/_UploadFile/Images/file/xilupagutigigonexox.pdfIn PDF document text
    • http://faradbox.pl/files/file/xozugiribuwes.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/mukumutevidozumejem.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c4ee95795a8---955886461.pdfIn PDF document text
    • http://winso.tw/userfiles/file/gerotupetusovaz.pdfIn PDF document text
    • http://nocleginaplus.pl/uploads/userfiles/files/90475909537.pdfIn PDF document text
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b412c56544---98034402386.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/zesukadasutatepopas.pdfIn PDF document text
    • https://evermoral.hk/upload/file/1624360166.pdfIn PDF document text
    • http://granite1962.com/clients/869125/File/99214535718.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a3bb5cd8346---vefaruvifebanuxijuv.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/kaxesirusipotabo.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/60257810956.pdfIn PDF document text
    • https://equimat-cheval.fr/file/1927144418.pdfIn PDF document text
    • http://verypool.cn/images/upload/File/somusobavelizidok.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160e316607be71---doguxokolukebowepe.pdfIn PDF document text
    • http://autoscuolauniversale.it/userfiles/files/75994425786.pdfIn PDF document text
    • https://dragonexpressml.com/userfiles/files/60834532724.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=editing+pdf+files+software+free+downloadPDF link annotation
    • 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_off0000da4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4D 17320 bytes
SHA-256: e14aaf2a788b650998f9f4520efd71c59134aab368f6cf45a267fa641c7d3222
font_01_sfnt_off000106e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011efb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EFB 10740 bytes
SHA-256: da42da5a4bba601f5d79481c82cb58651088c0bacdc82d434aceada3f69200b1