Malicious PDF — malware analysis report

Static analysis result for SHA-256 2440256d8e7f8801…

MALICIOUS

PDF

88.8 KB Created: 2021-09-17 07:01:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5b8035b4c38854816a47a404f3e91660 SHA-1: 76c874b18b0508b881acdc52ab1190f12e59e312 SHA-256: 2440256d8e7f880148284f5b4a6033a1224619150e675ff9b4185d0f099d2aba
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of multiple compromised CMS upload links further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://manegedebuitenwijck.nl/uploads/file/2857717285.pdf In PDF document text
    • http://madmojo.com/fckupload/file/jikoxupepatuvupidugub.pdfIn PDF document text
    • http://lightningriskassessment.com/ci/userfiles/files/4625054994.pdfIn PDF document text
    • https://medbioplast.com/klucharnet/images/file/buweriketixe.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/vubipodajud.pdfIn PDF document text
    • https://sanvexe.vn/webroot/img/files/84611420038.pdfIn PDF document text
    • https://cooperspick.com/files/fowowodafo.pdfIn PDF document text
    • http://www.physedu.in/newsite/userfiles/files/nalavirexogawexiwatavi.pdfIn PDF document text
    • http://studiocariola.com/userfiles/files/43641018867.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613d9377ad70a---71022838654.pdfIn PDF document text
    • https://thegioidongphuc.net/ckfinder/userfiles/files/21184497806.pdfIn PDF document text
    • http://jan-fotografie.nl/upload/files/54215541848.pdfIn PDF document text
    • http://tech-in.info/bramy/userfiles/file/52051365098.pdfIn PDF document text
    • https://knurussian.kr/DATA/upload/files/202109072336382746.pdfIn PDF document text
    • http://noithatnhapkhaugiasi.com/luutru/files/xoxid.pdfIn PDF document text
    • http://opuspointpartner.com/ckfinder/userfiles/files/wetotifapekev.pdfIn PDF document text
    • http://teewer.mn/ckfinder/userfiles/files/vupedexebuf.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/a52ddc12e052fb6337917f3ebd3f7ce2/82654945489.pdfIn PDF document text
    • http://geosond.pl/userfiles/file/megalu.pdfIn PDF document text
    • https://ln80.cn/filespath/files/20210910203148.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/1de56d28bfce278f70483815084aa0d1/51111023260.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/161388b2883554---81872261922.pdfIn PDF document text
    • http://patanamachine.com/imgUpload/files/73189411016.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=lucky+patcher+for+dream+league+2019PDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e15b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE15B 11428 bytes
SHA-256: 9000d8a3d8933b54e5bd426bb8caab64e3688aa7b614cde83c3a102b204f5b92
font_01_sfnt_off0000fc51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC51 22000 bytes
SHA-256: 4ac5c491f66bcc70442a19cedec71b0137cc6b74c0f6b3db4aaaa50f978f4a25
font_02_sfnt_off000134eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134EB 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_03_sfnt_off00013ce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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