Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d769c75005b4980…

MALICIOUS

PDF

76.6 KB Created: 2021-10-03 10:47:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: c9662b5a9fe9536418ae92094f010f51 SHA-1: 80982968537e5d33ea20136c822459aec2fce930 SHA-256: 6d769c75005b49807a30de41dfb29d3d4c406c12b86978d79da0c62e79b1dd23
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites used for hosting malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The presence of multiple external URIs and compromised CMS upload links suggests a coordinated effort to host and distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://queure.ru/uplcv?utm_term=data+communication+and+networking+forouzan+solution+manual PDF link annotation
    • https://globalathena.com/ckfinder/userfiles/files/58441437295.pdfIn PDF document text
    • http://cnmrobotics.com/files/files/nafovajepu.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/32991295214.pdfIn PDF document text
    • https://mp2020.csysadmin.com/ckfinder/userfiles/files/muruxiwagefigewuzefoluv.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142966a64f20---sufimezolepisa.pdfIn PDF document text
    • http://firmykominkowe.pl/Obrazki/edytor/file/90917603874.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/dd4c0cbb09a68f6f5ac502e1d14e840a/63885153137.pdfIn PDF document text
    • http://novafish.it/userfiles/files/37760734517.pdfIn PDF document text
    • http://tzsunup.com/upload/38901103889.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/161396cdb9529e---vafonil.pdfPDF link annotation
    • https://akproauto.net/nbloom/fckuploads/file/67199785020.pdfIn PDF document text
    • https://derya.afmiletisimajansi.info/resimler/files/4045544091.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/bepapividakatisukot.pdfIn PDF document text
    • http://ecocj.com/userfiles/file/20211003030054.pdfIn PDF document text
    • https://alohasafaris.com/files/gobatosifupaluri.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/tosimupujovafazegirewiw.pdfIn PDF document text
    • https://manhremhoangvan.vn/wp-content/uploads/files/rabejawaronelibivi.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1614154c28f5c0---10281831579.pdfIn PDF document text
    • http://lammermoor.net/imagenes/file/41711979140.pdfIn PDF document text
    • http://textingrights.com/userfiles/files/suwoget.pdfIn PDF document text
    • http://witnesstherealist.com/wp-content/plugins/super-forms/uploads/php/files/255149c3ecaa61b6b5b5b764c8e9f570/mevizilukaxijas.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16137660bc9b0f---sezipateromomuwa.pdfIn PDF document text
    • http://delfosventures.net/userfiles/files/83343599104.pdfIn PDF document text
    • http://aias.pnu.ac.th/ckfinder/userfiles/files/61673128162.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_off0000bd0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD0F 11156 bytes
SHA-256: 989d78dbebd9289945ff520bffd39b4cce772048102a6558e3833cc7e98b6fe3
font_01_sfnt_off0000d70b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD70B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF1D 20800 bytes
SHA-256: a5a7b4c3a9a31e3004c5cab8882d365d0c598e7400ffb3086ae597a2958365ad