Malicious PDF — malware analysis report

Static analysis result for SHA-256 96f5da3687f2348e…

MALICIOUS

PDF

79.0 KB Created: 2021-08-05 19:14:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8e073ad6536e9eaefa057395ef71ca7d SHA-1: d07b8c9489a5fc7ef4f146e080b044026965c24b SHA-256: 96f5da3687f2348e8041438f79c09a3eaa90feaa74f22f3c26337703fda9dddc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or phishing sites. The structure suggests a link farm designed to distribute traffic across multiple compromised hosts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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 http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cfe0f6f143---76680543118.pdf In PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/5e9ef5a5ff23981742deaa64f73120a1/20586316716.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/63461826211.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609074b18cca4---voliw.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/bojuzogabexa.pdfIn PDF document text
    • https://ruxthai-guesthouse-chiangmai.com/ckfinder/userfiles/files/55932120068.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/507448e4c32d160bf5ec43293b418914/ruvutoratizemaxupubi.pdfIn PDF document text
    • http://myshopekerala.com/userfiles/file/38447719813.pdfIn PDF document text
    • http://wignaccent.com/FCKeditor_2.6.3/userimages/file/20210709195131.pdfIn PDF document text
    • http://axwelindia.com/uploads/46014059416.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078abc39f159---dedakufavadagam.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/841b6bfc60366343fe99c25bbc55ea6b/zojufebobodenevaropogexu.pdfIn PDF document text
    • https://noithathoaphat11.com/upload/files/97817782829.pdfIn PDF document text
    • http://cipetbhopal.com/webimg/files/ragolaled.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c8da3b06a04---wazevibitem.pdfIn PDF document text
    • http://mingzhicc.com/userfiles/files/29288724984.pdfIn PDF document text
    • http://ji-tien.com/userfiles/file/pidebakemujokura.pdfIn PDF document text
    • https://marwaautorepair.com/nbloom/fckuploads/file/biliretuzamaj.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/48448996453.pdfIn PDF document text
    • http://umhouses.com/uploads/files/pefivukumusawegu.pdfIn PDF document text
    • http://limobebe.com/userfiles/files/xibifegeboji.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3560c85f28---79224373309.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/8487vftj3auo5ltphd8buphb2d/58243953125.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=colourpop+foundation+shade+finderPDF 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_off0000bc4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD466 10724 bytes
SHA-256: dcd3ea2202dc9c647817bd64aaeee256b687638923b61a20f329296a0ee4f868
font_02_sfnt_off0000ecf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF8 16180 bytes
SHA-256: d64c8c6eec96a691c8f0017435fc3016a891cc1e3bbe78ff85d6c2ae04d6907c
font_03_sfnt_off00010295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10295 16016 bytes
SHA-256: 1b1298795079ffc1eccdc62db5e68d394411d033dce9c6c70d25b83cad096dce

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