Malicious PDF — malware analysis report

Static analysis result for SHA-256 6385598bd0feb17a…

MALICIOUS

PDF

81.2 KB Created: 2021-09-19 00:13:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c583ac58117f6d463f2c725cb8912a2c SHA-1: b4fbf3e2fd0df55c76a5e7598bb30590823d6408 SHA-256: 6385598bd0feb17a116b74ce44812c1bef8048e4800867690a51f26bd4926e9e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is identified as a link farm, with several links pointing to compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://nomylo.ru/uplcv?utm_term=rom+mame+4+droid PDF link annotation
    • http://smelawservice.com/file_media/file_image/file/17010224034.pdfIn PDF document text
    • http://daisytalavera.com/userfiles/files/23709871840.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613cbb349c3c9---16195699940.pdfIn PDF document text
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/15728683409.pdfIn PDF document text
    • http://officeharbor.com/pdtInfo/zuladutowere.pdfIn PDF document text
    • https://pavillonwohlen.ch/userfiles/files/vobituvugijufopizotirafi.pdfIn PDF document text
    • http://finadev-groupe.com/userfiles/file/kotujoxusepa.pdfIn PDF document text
    • http://thanhnienxp.com/vietkiendo/upload/file/mojodukexuvur.pdfIn PDF document text
    • http://eot.mn/uploads/userfiles/files/mulisek.pdfIn PDF document text
    • https://wickedcheesy.com/images/file/vojul.pdfIn PDF document text
    • http://poddertradingandindustries.com/userfiles/file/kitapuwikegono.pdfIn PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/matepijijififiniz.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-9-9/20210909001432924586.pdfIn PDF document text
    • https://coolingrealestate.com/your-home-cleaner/FCKuploads/file/pofosutowozowed.pdfIn PDF document text
    • https://exlite.it/ckfinder/userfiles/files/5356222190.pdfIn PDF document text
    • http://yachtales.net/admin/userfiles/files/ragiruzunitiradanubin.pdfIn PDF document text
    • http://studiomanzetti.it/userfiles/files/33820572096.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/16130750828d9a---fobawinijuf.pdfIn PDF document text
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/f539606cac4106abbc217232db251f01/41472681321.pdfIn PDF document text
    • https://verner.lt/images/files/jonis.pdfIn PDF document text
    • https://phongkhamtamthan.net/uploadeditor/files/71087142555.pdfIn PDF document text
    • https://aspirecambodia-edu.org/userfiles/file/84355569605.pdfIn PDF document text
    • https://nsstore.mx/ckeditor/ckfinder/archivossubidos/files/tovaxaxubasi.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_off0000da15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f22c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF22C 10116 bytes
SHA-256: b6df152784466e1e7efbc53515339786892604393ddba85b27278cfa9b5af4b9
font_02_sfnt_off000108be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108BE 17260 bytes
SHA-256: 8f8012082c5cf3dcf90eaf9798eab09866058be0a40a353fc13e57823d0335a2