Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a55895f3d202f05…

MALICIOUS

PDF

78.9 KB Created: 2021-08-20 15:53:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 16c43239a09de970dc725dce7d36a25f SHA-1: 47c5389a2d05aa782f6dbb3e47f7b6809d195415 SHA-256: 7a55895f3d202f057c270ef84f7d57d20f67c1acf4c931b5498ac1913073acb6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm hosted on compromised websites, suggesting an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristics point towards a phishing lure disguised as a calendar download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://www.stjohnhomelessshelter.org/wp-content/plugins/super-forms/uploads/php/files/fcde62871d9078e9d6fe6ffb428083d2/97767120800.pdf In PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/b06ca9212f46b5735aebe96fc841bb85/jugemefedapel.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/xuwimapewikeluv.pdfIn PDF document text
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160762560b35ac---48416567074.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/piviw.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/firojasibiligududekosate.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090660a50e06---ralumoboxunoju.pdfIn PDF document text
    • https://afmiletisim.com/resimler/files/zuxukakevenoduvezux.pdfIn PDF document text
    • https://www.luthier-auxerre.fr/ckfinder/userfiles/files/remizebefunagateniwusar.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/3165004257.pdfIn PDF document text
    • http://cokhitienvuong.com/uploads/files/37321036963.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/zuredemiroziwevaz.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/d0ad1397cf8876472f221f6908c6cacd/siledobigilo.pdfIn PDF document text
    • http://henri-ruch.ch/doc_pub/file/mekoso.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609952109819b---kikuwujususidog.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16070dffb8e36c---46832205634.pdfIn PDF document text
    • http://chapelguild.com/images/usr/96361500500.pdfIn PDF document text
    • https://thietkeweblongan.com/upload/files/93961029630.pdfIn PDF document text
    • https://woodfur.in/userfiles/file/jirik.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/1586098212.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/95731710297.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/a58453ea0b96a6c2e68a9735aa95844e/53495187204.pdfIn PDF document text
    • http://belst.by/upload/file/kasuvox.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0c3ce58429---45465934953.pdfIn PDF document text
    • http://noithatnhapkhaugiasi.com/luutru/files/54787349833.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=kuensel+calendar+2020+pdf+downloadPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cee9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e6fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FB 16176 bytes
SHA-256: 7157efd73da25149da3c0deb6d048ca8a163eda718a34b33db03d7eec7e90027
font_02_sfnt_off00011156.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11156 10844 bytes
SHA-256: db25c68f560409f6767e8a028392346f6fb051b40514116b9920f9c9010c97c3