Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6a6829aef3abb16…

MALICIOUS

PDF

83.8 KB Created: 2021-09-20 04:29:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: fd18c7c8a99b43f8b9bd88c779ccd4c6 SHA-1: efc1657c5b2d8997bb14e0dee1bc3627dff94805 SHA-256: c6a6829aef3abb16966a97f3f9103cf9ec978636ad6ae5f8f33b15076c5d921f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. Heuristics indicate a link farm designed to direct users to potentially malicious content. The presence of embedded JavaScript suggests an attempt to execute code within the PDF viewer, likely to facilitate redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ganganagardentist.com/userfiles/file/felobavonuvamavep.pdf In PDF document text
    • https://shiokuda2.com/contents/files/68165616939.pdfIn PDF document text
    • https://monyetjoget.com/contents/files/zusuxuzasus.pdfIn PDF document text
    • http://qdxqw.com/uploadfile/file/46075659727.pdfIn PDF document text
    • https://eksiliotomotiv.com/upload/ckfinder/files/lozujebisogelop.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3005370ed---bodagazikeluv.pdfIn PDF document text
    • https://ce-mi.pl/uploads/userfiles/files/bapigaduzavovuzijugibeg.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/161332ce159fd2---42451989139.pdfIn PDF document text
    • http://titusauto.hu/kepek/file/88173482736.pdfIn PDF document text
    • https://jocafoto.com/fotos/file/5613945330.pdfIn PDF document text
    • http://xn--jt2b56wn0ap2a.com/upload/file/202109051012429439.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/161406ebe67d36---rurokimilovazile.pdfIn PDF document text
    • http://daieimotors.com/js/upload/files/55551039539.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/99401395292.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/mutonakelawaguxiburev.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/spvet2tjvfcl10u2hm2vfe5vmv/gatewavini.pdfIn PDF document text
    • https://hurghadalife.net/userfiles/files/vipusenu.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff9cb3025b---fuxapurokuvig.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1612f1cba537a4---71004673539.pdfIn PDF document text
    • http://fpempresa.cen.es/userfiles/files/dixasonugabuvovodetug.pdfIn PDF document text
    • https://rsun.pro/admin/ckfinder/userfiles/files/43540967074.pdfIn PDF document text
    • http://incomsistema.ru/ckfinder/userfiles/files/dokevasirixetedosu.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16147c66f86cd3---divoxojowefasom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=application+creation+logo+androidPDF link annotation
    • https://mediacentre.heathrow.com/js/ckfinder/userfiles/files/kivitafofufuvaworeg.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_off0000e466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE466 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC7D 10500 bytes
SHA-256: 15a0c029c1b56abd57c2f38da61ae5f85ea25b5b7429ea9b3fc13fe4f1ffef50
font_02_sfnt_off0001144c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1144C 17312 bytes
SHA-256: aa60a5349c1b1e15999e7dac6eadfbe9b33ef9950ccead92755392954c4adea7