Malicious PDF — malware analysis report

Static analysis result for SHA-256 c21c2d37d4b0f56c…

MALICIOUS

PDF

87.2 KB Created: 2021-08-16 15:10:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 19f51085ab58fe44c2c555beb4ef1557 SHA-1: fb6954f7d98a0f878c5d58483a47c79dbf554b1d SHA-256: c21c2d37d4b0f56cd7e6a86ff359865f9a0fbf2b3406bbbdf306e05ec794709e
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The primary purpose appears to be directing users to potentially malicious content hosted on these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

Heuristics 6

  • 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
  • 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 https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/ff9e656e615fd5fcfdbf93fbf0a0878b/52286163066.pdf In PDF document text
    • https://matfplayer.com/calisma2/files/uploads/tunud.pdfIn PDF document text
    • https://luminex.pl/upload/file/loxigedalav.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0c0244281---finukuxeveboxezew.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/1fci9k6jt0alm81pjb4aohsh4f/mubidovuvedox.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/4ijg1i93egatrjvq2915mi25m8/mitikojetusubusapudizajuj.pdfIn PDF document text
    • http://hamyarsanatco.com/ckfinder/userfiles/files/17420200765.pdfIn PDF document text
    • http://kirakuramen.com/uploads/files/61086716178.pdfIn PDF document text
    • https://tenekedjieva.com/uploads/file/gulobekarajik.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/nonizifori.pdfIn PDF document text
    • http://gasasosong.com/upload/fckeditor/file/pixusetupukumez.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e2f49e7dbb---40136983194.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/5778b426165b6fa2a3fbea641d285e4a/21624127312.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/666f76710c03e1fc8966213a7a20d524/62680541674.pdfIn PDF document text
    • http://recviem.ru/img/upload/xumosagujapoguvivip.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/20151891162.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/bopidulufidewiwisevexo.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16070870e5259c---17719539808.pdfIn PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/5020581793.pdfIn PDF document text
    • http://esthebel.de/userfiles/file/42590403650.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/160be687c3e97c---dibiparigixifomijez.pdfIn PDF document text
    • http://reneenicoleevents.com/clients/865995/File/lozebeferifowudexul.pdfIn PDF document text
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1608066d274395---kokalowugelabizoroxevuvid.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/53099085363.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=believer+korean+movie+full+moviePDF 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_off0000e6c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C0 16932 bytes
SHA-256: 5687b245f1869db40c7c35e8a21ec99eaa9756b91891ad6fab1b9a3aed486b1f
font_01_sfnt_off0001131f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1131F 10420 bytes
SHA-256: e4c203908615ab1d32b99bd346f5c96d009e4854e43b52c8378d84d24e2c7a74
font_02_sfnt_off00012aa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AA7 1980 bytes
SHA-256: 9b74feb7cf90bc71bf696215dfd67f457f4e10008276eacb4baca4f679803f0e
font_03_sfnt_off0001339b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1339B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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