Malicious PDF — malware analysis report

Static analysis result for SHA-256 440df22daf4dc6f1…

MALICIOUS

PDF

71.2 KB Created: 2021-08-04 03:50:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e61afe6699ad3aa28224528ae0432892 SHA-1: 0cb8a1f6b7f4b335c720488b5cc3d0842d060731 SHA-256: 440df22daf4dc6f11541afadae1f76ea5033827f5e402fe08cc77d44befb955d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories. These links likely serve as lures for phishing attacks or to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9597

Heuristics 5

  • 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
  • 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://pistant.ru/uplcv?utm_term=fender+deluxe+roadhouse+stratocaster+2016+review
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608984f4a09a7---72009966881.pdf
    • http://nhs-carpediem.com/clients/46367/File/78872001092.pdf
    • https://khotelmarket.com/FileData/ckfinder/files/20210612_0FB2AB1598671C51.pdf
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/2d7e09be8066b7506dae1dfe38acb193/kerepawiperipuw.pdf
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/bcbd0e1e8c9546373354382501d83878/34508067704.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/4867f106488c1caa7e76c3e59ad8e0f4/52014743081.pdf
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b83ac6e171f---16745189508.pdf
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608842d64cfcb---muvawozivejamuxupemeteju.pdf
    • http://angelojrobles.com/admin_initial_test/userfiles/file/tivejikobibiberip.pdf
    • http://mrbossamktown.com/uploads/files/jedonelupufonilolu.pdf
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/ef2a40f0cb1552e86bca92c72d834fd3/veverirunapufebejowepiga.pdf
    • http://jrpst.pl/userfiles/file/vegipetorukekoz.pdf
    • http://sbsinternationalschool.org/sbsisnew/userfiles/file/14082728772.pdf
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607cacac06251---zurus.pdf
    • http://tscyw.net/userfiles/file/20210717183234_etr0p6.pdf
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607853fc1d1e9---sanoloturodifetasu.pdf
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/75792646427.pdf
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/6787aaedb83b2556f0e3a41626a8bd2f/novosofo.pdf
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c64a1781da8---82290690595.pdf
    • http://asustainable.com/global/file/16155115340.pdf
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/8g3svko4ailrsafh75u0k96moj/5406665026.pdf
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f67ef90d671---61786933587.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbf080709d---muzapewutokijixeg.pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed8f.bin
2a49483fd7b657867a0b48598d05fa3cdf4f0ed5adb6c8991fade2c78e4efc0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED8F 18072 bytes

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