Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee1635954f6aa122…

MALICIOUS

PDF

74.6 KB Created: 2021-09-08 09:45:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: b4ffd96cf5c43d2ad64b9de559db71c6 SHA-1: b399311a355507db1f25605e2c8a0325a63ba607 SHA-256: ee1635954f6aa1225d93ddf71e8e4dbe5df5680cff4014096bc81b567ec47de5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The heuristics indicate a link farm pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://pixomot.ru/uplcv?utm_term=jaguar+xj40+service+manual+pdf PDF link annotation
    • https://bhsbeacon.com/FCKeditor/file/zugag.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/1608e51ba3acc1---timododizakipazo.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/160703dc6cfc8f---foluvulukikowovix.pdfIn PDF document text
    • http://abpaluso.com/upload/file/pokikavelujufulonaronat.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/37752264489.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3049c9bbf0---62082087728.pdfIn PDF document text
    • http://caythuocdangian.net/images/files/52087122434.pdfIn PDF document text
    • http://dhf-china.com/d/files/21427368419.pdfIn PDF document text
    • http://wwpokebar.com/uploads/files/luwib.pdfIn PDF document text
    • http://thanhtindesign.vn/uploads/image/files/79172366019.pdfIn PDF document text
    • https://merohamro.com/ckfinder/userfiles/files/tanodesaveziwiro.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1fd5747333---nozijorukejivetapi.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-7-7/20210707022220701553.pdfIn PDF document text
    • http://sireny.net/share/files/baziniv.pdfIn PDF document text
    • http://katour.ru/admin/ckfinder/userfiles/files/wilifewuwevowivuledojadik.pdfIn PDF document text
    • http://boldino-hotel.com/ckfinder/userfiles/files/95322278815.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf668b06d4---2501298143.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf45ff6b3a9---gurogileboxosukumuraz.pdfIn PDF document text
    • http://garageanything.com/js/upload/files/85064672782.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/90845009459.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/96520283130.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/554a6430d04149222c00bcd269085544/pebizutisizezonimemaxetu.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/aba90daf1d92ce29caf960a176315bba/2558340970.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6aecb482ac---pebaleloziwapazonitadaxeb.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_off0000bdb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDB4 17272 bytes
SHA-256: 8f5df13504e88bf71c7555d64ef7739d4e53ecf6aabbf9e6ce21f83a7cc5a723
font_01_sfnt_off0000ea78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001028f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1028F 11336 bytes
SHA-256: 40bd38634e7ba4329add13690e88e7981c87531938839fee3ca7717806fee565

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