Malicious PDF — malware analysis report

Static analysis result for SHA-256 de2f21f5169f915d…

MALICIOUS

PDF

88.5 KB Created: 2021-07-21 04:08:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c94a6d0d1f9e723166aac997f64eecdf SHA-1: 37f6d60521f1213c93e0c1d79774f8be3442e4c8 SHA-256: de2f21f5169f915d2302e2320d556c13fd4b73108025cd77560d3d4c407406aa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external websites, many of which are hosted on compromised CMS platforms or disposable domains. The embedded URLs suggest an attempt to distribute further malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609847162289d---tejidebazenoxabixaw.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16098937638815---tamonagofu.pdf
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/23128361400.pdf
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/3ppkmmmqleonu1l7e1qp80t71s/tolokumopeseranisawidi.pdf
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/43d9f48ee03fe6a871867311185bf723/8660697746.pdf
    • http://dmhfamilyreunion.com/clients/4/44/44eff64e497b984d8b2945277059c9c0/File/529440347.pdf
    • https://accuratesearch.com/userfiles/file/vuvuxavidedil.pdf
    • http://mevlanaasm.com/resimler/files/tosewozafaboxazavijo.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160c6161b0605b---62254409936.pdf
    • https://espaciocultivarte.com/ckfinder/userfiles/files/11936406122.pdf
    • http://yjsyrj.com/userfiles/file/rozedojesibopojel.pdf
    • http://imaginove.eu/data/Files/91111438408.pdf
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/8joold8o58v6k0leg1k6hp9m3e/piwulukikubofu.pdf
    • http://staropolski.net/Upload/file/95208989524.pdf
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/n7vo7b2gquj2vja6au1klgd2t1/88004072364.pdf
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/ia006ik958rjqbiujpqfrc7ev0/2468726191.pdf
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/sn0a2migoq6o0eulaj24qmhdrv/52068774736.pdf
    • http://bright-mineral.com/uploadfile/file/2021060414471891.pdf
    • https://gwynharmon.com/home/gwyn/public_html/ckfinder/userfiles/files/lewafijafokejusogu.pdf
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/bb1e940351a08ca73e5580bcd0fd11f6/wepomudo.pdf
    • https://appfacile.it/file/90039040610.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609b277f1e427---83822760176.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606fcd98350af---93877358396.pdf
    • http://myphamlulanjina.com/upload/files/gameb.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16071114ec4993---rodinadilizalugawamu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=the+suspicious+housekeeper+ep+1+eng+sub+dramacool
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e802.bin
4c058c3bca7abf64bd9e6c7ce37e3d14f482f4b8b4fd4928b82219f29e007115
pdf-font-stream PDF embedded font (sfnt) at offset 0xE802 2696 bytes
font_01_sfnt_off0000f39a.bin
ac63c8ba7b994366d80f52ee101035fa0ea9305e0727c71e0e0ae00c2a58424b
pdf-font-stream PDF embedded font (sfnt) at offset 0xF39A 17956 bytes
font_02_sfnt_off000121f6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x121F6 16792 bytes
font_03_sfnt_off00013a0d.bin
1be6a650d1690f4e16ac19fb7169dd02cc1dd0371b7c164f83b38b1910163f54
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A0D 11208 bytes