Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff11eb533ba01ca7…

MALICIOUS

PDF

78.1 KB Created: 2021-06-15 22:10:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 6326fc32c739269544543e9cffa3522c SHA-1: 98fba977dedea1d6c24241e952a771dc618b8e89 SHA-256: ff11eb533ba01ca7ce5d9d7d4a20f6ef45c683f2a952a6867b698cd7676c3be2
154 Risk Score

Malware Insights

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

The PDF file contains numerous links to external resources, many hosted on compromised WordPress sites, suggesting a link farm designed to distribute malicious content. The ClamAV detection and ML classifier indicate a high likelihood of malicious intent, specifically identified as a phishing trojan. The embedded URLs and the structure of the PDF point towards an attempt to trick users into downloading further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7069

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://infrive.ru/uplcv?utm_term=ti+nspire+cx+cas+manual PDF link annotation
    • https://btegypt.com/file/gosebagogekesupeso.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/a9a13fc228f96c8bfbe86ccfc35d682f/tarelufewezunavipemed.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/d7f15be8cfbbd67657db6fb3a0752f8c/58594103482.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ad639313e---66937433733.pdfIn PDF document text
    • http://vorne-sitzen.eu/pcms/content/file/kovuv.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7c16d1c65f---27196269234.pdfIn PDF document text
    • https://parfumzone.ro/files/file/45659046873.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/kesoletakapemujasufimoxe.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1608d34ae0d304---16399030657.pdfIn PDF document text
    • http://gagutp.com/sa_upload/userfiles/file/20210526123412.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa1bc1b6df---dujilivolu.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/mutomefosalojufixowef.pdfIn PDF document text
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/a21441fc4459db4d144ff9068db613c8/8532072312.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/7e390f4bcb3435d9afdc5eda39a7c479/tuvinogezeturu.pdfIn PDF document text
    • http://polletnv.be/uploads/files/12524135918.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5c2f326aa6---vogonapijiritixo.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bec786c2144---gitibepetus.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7fda30f0d6---98943011628.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160be2292e8c02---kojixurig.pdfIn PDF document text
    • http://granite1962.com/clients/869125/File/5805069328.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_off0000ec66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC66 14240 bytes
SHA-256: dbe512c7ebc5f9a83780488f3e759cf42fc0e9834445170eab3b973ad5dfb94c
font_01_sfnt_off00011ad9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD9 5096 bytes
SHA-256: 7626471d34abdddff4d332ca254a1d2d93633b2da38836df6f6433e0164b5936

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