Malicious PDF — malware analysis report

Static analysis result for SHA-256 b20bf197902b78f2…

MALICIOUS

PDF

84.5 KB Created: 2021-06-27 01:54:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5c4e848174c4502e9638a8c4a88dad1d SHA-1: edd6e7ebd7847a0c8552cf938b91191d05341279 SHA-256: b20bf197902b78f231205b7c739bb518c872c0b53e9c0c5bcb470a7494ffb7e1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress sites, suggesting an attempt to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a link farm strategy, and the ML classifier strongly flagged this PDF as malicious. While no scripts were directly extracted, the PDF structure and link farm behavior are indicative of a phishing or redirection attack, likely using embedded JavaScript to facilitate the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/48f9fe8a8116cfbe427546fa05024aac/zavirubulinibo.pdf
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607a79e52f5b1---56312317584.pdf
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160bdb0001d2d9---wozeruxevelojawabisuwa.pdf
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/db93e682a7dc4b9886a449f3fd6af32b/lonifesimifajoxawexix.pdf
    • https://dimensioninteractive.com/WYSIWYGImage/file/bukekudokenabovud.pdf
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608f3250ebb48---bawejepexebedadiputobosi.pdf
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad00a339da2---66735183772.pdf
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087936e28ce1---wusonelipulituwusi.pdf
    • http://ottotech.center/userfiles/file/25550121647.pdf
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//42583379053.pdf
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/7gh6o38ec1rekfbf6q99kputn7/gasodifoposovu.pdf
    • https://roofmed.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b18e52bb80b---posiviranogusodigatofag.pdf
    • http://hawks79.com/clients/85064/File/dutoxikobisipodomineboxaw.pdf
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5332040d70---93548493102.pdf
    • https://atamergranit.com/userfiles/file/jimejanoxef.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099e5ff67374---xenetedolazizetitediza.pdf
    • https://actor-conseil.com/files/file/zakiwos.pdf
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5f6878e6a---sobolukaxerupax.pdf
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/0277371848f2c92ddf8a62aa63852239/kowamoxepu.pdf
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/b5fb7ab99332e444e36baa78f7b0a0fb/88164050644.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1609411a52afc2---38411451132.pdf
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/ud62bvnbrsuahitohqagme2kcm/48220024401.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=termination+letter+due+to+business+closure
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9c8.bin
3c3594e6c419a8ce488c4d4b22533b06c37f066d8275aef0770d72c84f3de417		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C8 10732 bytes
font_01_sfnt_off00010268.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10268 16792 bytes
font_02_sfnt_off00011a7a.bin
62cefa4fd361a4749780b6316a18b3ee03798ad7abf583fc0c1920361175ac0c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A7A 16252 bytes

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