Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3bce6c1ed4a5724…

MALICIOUS

PDF

81.5 KB Created: 2021-09-03 20:59:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8831a1b2d581e06b916d8c5c92966436 SHA-1: 864aabf400aba8af94f36fbbfd3f59cc0a400f77 SHA-256: a3bce6c1ed4a572427c279e5186f7598c35d43004ed0bc5b0eaf87087415a9dd
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 websites or link farms. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are designed to host phishing content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://ketchas.ru/uplcv?utm_term=missouri+child+support+calculation+worksheet+form+14 PDF link annotation
    • http://duocthientam.com/uploads/ckfinder/files/9357024892.pdfIn PDF document text
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/vatifomot.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/f4336b5b2cc326b7bd0213be26a94cc5/zaxikenaresaxorezosa.pdfIn PDF document text
    • https://guineaservicesproviders.com/gsp/files/jinasakikuf.pdfIn PDF document text
    • http://www.trackls.com/application/ckeditor/ckfinder/userfiles/files/73022778389.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3551598e6---zinogowirozamunodonumom.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/731a9932815db10889f68adb466d6b28/76569114617.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/3f2886e17c6b33ba025c76b756be4846/19110717678.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/64649350755.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16082b8e3eee16---xitufamap.pdfIn PDF document text
    • http://karpatskiles.ru/store/files/kizuxoduralo.pdfIn PDF document text
    • http://eurekaelearning.com/upload/news/file/37969554102.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/lokivedal.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/66272b8ea5391b4d93242e216b6ccf57/95368350992.pdfIn PDF document text
    • http://jeyadhurgatemple.com/userfiles/file/39510871800.pdfIn PDF document text
    • http://garankuccu.com/upload/fckimagesfile/98be7b0451191889fda3d36b6de32b18.pdfIn PDF document text
    • http://labonscafe.com/userfiles/refosevufo.pdfIn PDF document text
    • http://english-life.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16073085c3a14e---14650634523.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/ckq69vjkgnf9ficd4dfdfiqhr0/28630443219.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/0a2c38328d21aef534a8013f12b02046/piwikisewuwode.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa34077c46---31110762743.pdfIn PDF document text
    • http://all-premium.com/user_file/files/libekopajilu.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/e1fec814e5aa4e2b092d28cf2275291f/17943390574.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609eea14b657a---jaloloxikovafaginazovumun.pdfIn PDF document text
    • https://karpzbeldowa.pl/uploads/userfiles/files/vosopulokinarixelosuvad.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_off0000da9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA9B 11284 bytes
SHA-256: 5233a46f132cd31d963d0204dbe43e9ec7924b0bb17f49c5924b6f8cf5cac6cd
font_01_sfnt_off0000f516.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF516 16280 bytes
SHA-256: b9dc452d43a902ba49478952a9bcc0677f0f441fd918dde1be848de3dd0b0911
font_02_sfnt_off00011f50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1