Malicious PDF — malware analysis report

Static analysis result for SHA-256 4021c142c24514eb…

MALICIOUS

PDF

73.4 KB Created: 2021-09-07 02:14:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9f4c071c6bab6af97124dff3352b7ff7 SHA-1: 3f353c04a3117fb8f8a38cc3a15cf7404e0926ee SHA-256: 4021c142c24514eb9b52d1805c3def68889af7166ffad98d2cc00efa47ad31fd
154 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple external URLs, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of numerous links on disposable hosting further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7125

Heuristics 5

  • 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
  • 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://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9759b66a3---zulunu.pdf In PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/vaweweretixevezezafubur.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/8be7853c830d50af369d43fdc5f57dd3/60629893038.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/t2aodrk19fol5eocosu6g2gkt3/48392692406.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160bbc5d1e445d---fabutolalimajuxadojuw.pdfIn PDF document text
    • http://1000projects.ru/upload_picture/file/bofuwaxugomipexedisoxetu.pdfIn PDF document text
    • http://gidaero.com/upload/fckeditor/file/84845490931.pdfIn PDF document text
    • https://poolpoint.be/uploads/file/kunowolunoduv.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/b289ab255ffc5dee7391ea4f770fca0d/637528710.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/14767602542.pdfIn PDF document text
    • https://arrad.ch/modules/ck/ckfinder/userfiles/files/5530318575.pdfIn PDF document text
    • http://rollfactorytogo.com/uploads/files/ligonaripusufeliti.pdfIn PDF document text
    • http://cokhihoaiduc.com/uploads/files/muxemimuru.pdfIn PDF document text
    • https://alianzatours.com/imagenes/file/niwogatononodepufoxexilu.pdfIn PDF document text
    • http://mega.kz/media/upload/files/37108002996.pdfIn PDF document text
    • https://fanaf.com/article_ressources/file/71132955181.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/nadipifekifawubumupis.pdfIn PDF document text
    • http://havefuntogether.com/image/upload/File/libebapetubaxugewerug.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/949ec96f9a0bcd55154f32880c9d8e8c/notibatejun.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/236m44rmfmsbq3flrk6bnviapk/51361941174.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e7e43aac4---79951368300.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8da7fa0dd3---87355514344.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/73037844278.pdfIn PDF document text
    • http://appletechsolutions.com/userfiles/file/60842711782.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160786ad05606a---44132014458.pdfIn PDF document text
    • https://cincia.ro/ckfinder/userfiles/files/nafavibilekozatav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=sacred+geometry+in+nature+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f62e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E45 11040 bytes
SHA-256: 6c73f2de551a9d8e80d1672dfe08e86dfcc4957b443e5e738c3f86c0d54cbf49