Malicious PDF — malware analysis report

Static analysis result for SHA-256 95c6764d3671ba0c…

MALICIOUS

PDF

85.3 KB Created: 2021-09-08 13:44:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 437dab1f16ab3ed236ab58a902060191 SHA-1: 554fc4f1a3ae8c1a28e5f957bbe0bea299986851 SHA-256: 95c6764d3671ba0cf3b718fb1888e942760c9065ba89ab83465f2167e9eef439
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting. Heuristics indicate this is a link farm designed to lure users to external sites. ClamAV and ML classifiers also flagged this PDF as malicious, likely due to its phishing and trojan characteristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/arirk3d6nu15i51001mulo58d1/kiwufofexo.pdf In PDF document text
    • http://divorce-difficile.fr/userfiles/file/tezeladuxulurinenowowalin.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/7864738933.pdfIn PDF document text
    • http://tlumacz-lipno.pl/pdrzewiecki/files/wozatusubifumuwiz.pdfIn PDF document text
    • https://xn--49st2et51duvk.com/upload/files/wokugekimogawinikona.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/jubugiwugi.pdfIn PDF document text
    • http://jualumnitoronto.com/editor/uploadfiles/zupikoweraboxanizerux.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16136d4a3602ae---mawav.pdfIn PDF document text
    • https://bobecoingatlan.com/uploads/editor/file/2100110306.pdfIn PDF document text
    • http://lesbambousbleus.fr/ckeditor/upload/files/gawuwebovupaforeregulu.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16133f47a2f8c1---tamopimifelodabivepa.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/86806553175.pdfIn PDF document text
    • http://hoteldanang.vn/uploads/images/files/19817950749.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/20833179606.pdfIn PDF document text
    • http://scea.edu.mn/ckfinder/userfiles/files/pirov.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612feabd8f756---pinuzisul.pdfIn PDF document text
    • http://besteva.com/upload/files/tutideraletowevi.pdfIn PDF document text
    • https://maviet.vn/upload/files/megulid.pdfIn PDF document text
    • https://berettyotv.hu/userfiles/files/luvafarolozex.pdfIn PDF document text
    • http://belean.pl/userfiles/file/fisaxetajupereriku.pdfIn PDF document text
    • https://www.vignolaweb.it/ckfinder/userfiles/files/7879195052.pdfIn PDF document text
    • http://offerparts.com/upload/files/xebejawiwurosuzepu.pdfIn PDF document text
    • http://ues-rb.ru/themes/ues-rb.ru/files/78478376044.pdfIn PDF document text
    • http://24hnbc.com/assets/ckfinder/core/connector/php/uploads/files/jikebujoguzarojemo.pdfIn PDF document text
    • https://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/98705331694.pdfIn PDF document text
    • http://pneusmarene.it/images/file/jamuwurali.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=iab+categories+pdfPDF 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_off0000e82e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE82E 18180 bytes
SHA-256: 9cf87ba94a31e3e066464038f537b4dc3da8c68c3b25739dc72cf821c9118487
font_01_sfnt_off00011784.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11784 10736 bytes
SHA-256: 8fd9180f7e6c6a0c26d2a960dbe20bacc53e92ae1ad60505be68e8b0982704b7
font_02_sfnt_off00012fec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1