Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bb361e410f81eef…

MALICIOUS

PDF

73.5 KB Created: 2021-06-11 18:21:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 6921f69bd3540c9ada67cfb743b1f2fd SHA-1: 8e10f12d2986c165fa4b4d507e3b5ea657beb14a SHA-256: 3bb361e410f81eef074f248fe92be4718ce8c3ecbb5c5c0a3a0008e8fb199151
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8377

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 https://cructi.ru/uplcv?utm_term=manifest+your+destiny+pdf PDF link annotation
    • https://hasekei.jp/userfiles/file/sajovewexuwi.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec36a756e4---43506083290.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/43e2e4b23626c8995d0caf2372bddc74/19403436829.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/160706310755b4---gilunofozijevagidasoziv.pdfIn PDF document text
    • https://prikolnaya.com/wp-content/plugins/super-forms/uploads/php/files/fa4bd594da35506a2ac71217531d5ba8/lozupamonew.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/f94ec501aed3554dfbcd73c6eb5240dd/kobow.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/39922505711.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/99128149506.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b61ba994c---fulavizekokolo.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/b4d638289b3fb30043f2e030e53dfc06/26991109193.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c0958b72936---wikabulutuv.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/674c5dd3626e72b1d9ef9795b0e29e34/81607261030.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/vimimugopetigubaragajo.pdfIn PDF document text
    • https://taevlingar.se/images/pages/file/jaritububorizurosunefavi.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a79a7838b74---lupawulelusagivis.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/q25205sn32sari9rv7486cio4u/14344960141.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e86a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE86A 5108 bytes
SHA-256: c1a285d4ce03e0808a0d0614c2916130272b8dc8abb62f98796d73ba4a333fdf
font_01_sfnt_off0000f9f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F3 10540 bytes
SHA-256: 6779796eccdaedb4c0d4ab3cbfc674ba966bab2812406374ce39419bf2801e76

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