Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6ef6e6c6f4d2d33…

MALICIOUS

PDF

78.0 KB Created: 2021-09-07 01:32:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6b083ca81b4c69674453b0fe78c7a74d SHA-1: 712f98b0e8e9b4d83419ca6b5671c84ea573cde8 SHA-256: d6ef6e6c6f4d2d33ec0710ac3940ac15b2bb3b2afccfd941f36d3ded135ea6b3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics indicate an attempt to distribute malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 6

  • 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
  • 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 http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/2o1o619usuek2kka4ridu2unk4/21864856898.pdf
    • https://projektovanje.info/userfiles/file/tonajewarasatebajobol.pdf
    • http://kapli74.ru/upload_picture/pujez.pdf
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ab4aea6a8e---teguxodopawi.pdf
    • http://goodwill.pl/userfiles/file/84680966368.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b8950e08a57---87028195816.pdf
    • https://thehideawayresortpattaya.com/userfiles/files/14766143977.pdf
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/eb5c5f7fe1c968a5a7c37602fa8d54fc/pexidotikujoxu.pdf
    • http://slhospital.com/upload/fckeditor/file/29815840047.pdf
    • https://ckmusicdesign.nl/userfiles/file/34231815263.pdf
    • https://agape4u.org/userfiles/file/23325381170.pdf
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16081d2282b3f9---33611712246.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611a88581c8aa---13740185196.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609828651b370---63319674523.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/160773999c28b6---9749255157.pdf
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4e9ec6de3---21403538496.pdf
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611eea0c31403---jamemudofebizasetug.pdf
    • https://zlato-eu.cz/upload/files/45250552038.pdf
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba51caffa7---58691596732.pdf
    • http://decalvanphong.com/img_duhoc/files/numiriwesi.pdf
    • https://cafe-malaysia.com/contents/file/jepomibufawun.pdf
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202105021654006936.pdf
    • http://musicpark-live.de/userfiles/file/73020726306.pdf
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9cd65a038---38930130977.pdf
    • http://travellightnepal.com/userfiles/file/jefupi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=macmillan+mathematics+pupil%27s+book+3a+pdf
    • 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_off0000c691.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC691 16792 bytes
font_01_sfnt_off0000dea8.bin
69aa2c1a7c3e5e1d347be60069c4fcb0479f1f7b0c724f4c9115bae34efe7871
pdf-font-stream PDF embedded font (sfnt) at offset 0xDEA8 11316 bytes
font_02_sfnt_off0000f8de.bin
46839b82d80ade9ed92c25740009de097f061431570b561ba44858093e4e71df
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DE 18436 bytes