Malicious PDF — malware analysis report

Static analysis result for SHA-256 b646a8e6916f91a9…

MALICIOUS

PDF

85.9 KB Created: 2021-07-06 23:38:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: b69912978f0aa31b391d67db9d7126d2 SHA-1: 601b129dd80cd63649d7a90249af12e43ab9b629 SHA-256: b646a8e6916f91a941f0be115184ef49869a4cf5b6db5161efb0f948cde87377
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, containing numerous URLs that point to potentially compromised WordPress sites. The presence of these links suggests an attempt to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6306

Heuristics 5

  • 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
  • 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 http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a8cd6574d0---fixikonuxex.pdf In PDF document text
    • https://a2designbg.com/userfiles/file/gejejujewa.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160b35b59caff8---zutipesegobun.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086a271d7bf5---40473812129.pdfIn PDF document text
    • https://thedestinbeachhouses.com/wp-content/plugins/super-forms/uploads/php/files/3d43b83523c23eeedfd7925e7cc6c2f3/32918017856.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c211f30fce---rejavezoferuxupagujuroxu.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084967478859---61019786216.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/306cbce8bafae8156adc86c9794c5dc8/87971576773.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/4976b73ea219af8539614693f244d240/bujewogevofewatujibif.pdfIn PDF document text
    • https://www.ergunaygoren.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083db77a4507---monofajozej.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/depoximagojadisolafema.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/847bd21f7644c5558681ef45e93f37c8/3167287283.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/2dde62b695ec633a81f016a19ba558c6/9425102234.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160800e3aee40d---82663877017.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb3113ad63e---jusopoxuwebenujifun.pdfIn PDF document text
    • http://seabeachthailand.com/UserFiles/file/kimajagudexad.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7eeccc0e0e---97533713557.pdfIn PDF document text
    • http://bscartridge.com/pic/luwuwofobuvasimusat.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/kixuga.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c96e2681055---25714990144.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606f539b17eb1---sufuwe.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/fogomodu.pdfIn PDF document text
    • http://asfus.net/virgsurv/userfiles/file/17492481274.pdfIn PDF document text
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/3hmn57v8iaauuplpag5aim08ua/ritazezidurozekoxexodu.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/29240072361.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=mark+newman+networks+an+introduction+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011e82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E82 11004 bytes
SHA-256: c7145cd9dbc784d94581369fb5d55f6ba771de42699577d4a6e9bd1b47a110cd