Malicious PDF — malware analysis report

Static analysis result for SHA-256 54ef865cbe463a33…

MALICIOUS

PDF

71.4 KB Created: 2021-09-28 04:37:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 57f11101dc2b97fd00e83f32dcac97c3 SHA-1: bdd21ae25c1a1cfeea1e6d5faae7cf50ed7aa1d4 SHA-256: 54ef865cbe463a33140086213f7361235942e713fa1ace0591597ac402d12da4
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting it functions as a link farm. The presence of external URIs and the overall structure strongly suggest this document is designed to lure users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://infrive.ru/uplcv?utm_term=android+7.0+bypass PDF link annotation
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///95229262039.pdfIn PDF document text
    • http://adas-muko.pl/photo/file/71141366935.pdfIn PDF document text
    • http://hanhthien.net/uploads/file/56501244815.pdfIn PDF document text
    • https://springkasteelhuren.be/userfiles/file/kowediwokaruzozenamuza.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/gegexinisajire.pdfIn PDF document text
    • https://www.nobleorthodontic.com/wp-content/plugins/super-forms/uploads/php/files/223c56f029bf66aeb803623d8b4cff13/80529579068.pdfIn PDF document text
    • https://duvanco.be/docs/files/dubizukuvudonutabik.pdfIn PDF document text
    • http://1544-7419.net/upload/fckeditor/file/rimonojowe.pdfIn PDF document text
    • http://steffis-strassladen.de/userfiles/file/vaminemezu.pdfIn PDF document text
    • http://zsmnowakowski.pl/userfiles/file/56381442731.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/bexejedoku.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/32358400981.pdfIn PDF document text
    • http://movitecnic.com/ressource/site-image/files/44003287362.pdfIn PDF document text
    • http://templeton.sk/userfiles/file/biwuzikowoxolarido.pdfIn PDF document text
    • https://pacantioquia.org/aym_image/files/nezawinawagurevu.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161356fee306d5---vobobelapesabom.pdfIn PDF document text
    • http://marketypik.pl/zdjecia/fck/file/66202835378.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/t5kn71irlen75jqsq2vvp9k7ud/zogogefogofed.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613658e41441a---negeta.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/1614236336cdfe---88599952923.pdfIn PDF document text
    • https://10fci.org/userfiles/file/71983807503.pdfIn PDF document text
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/rofawumusitadip.pdfIn PDF document text
    • http://saringkarnwood.com/UserFiles/file/selirejixegipiloxutasera.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/9655ae549b8a195e621d5be67f8a9f1d/gikomarajifevaniju.pdfIn PDF document text
    • 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_off0000b492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB492 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cca9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCA9 10584 bytes
SHA-256: 09cc0b04607295145a5299cd0109d9882d29fc928b5efb594d140369acdbaa43
font_02_sfnt_off0000e4ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4AE 16928 bytes
SHA-256: 8995ef19bd8a558ebca0c4e6fe6eb498bd0e35830adefb24c3d7e1e5473bba2a

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