Malicious PDF — malware analysis report

Static analysis result for SHA-256 c852b62e1f527c25…

MALICIOUS

PDF

80.6 KB Created: 2021-09-03 22:07:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 85da5addad5c505d76452f7d59b678e2 SHA-1: 1f05689c1cf7281ba877a0813eadbdd19ce72ffb SHA-256: c852b62e1f527c2508a4b910e944a80db9968f871ff8cbfed308bcd62b4843af
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, and contains numerous external URIs. These URIs are part of a link farm designed to redirect users to potentially malicious websites, likely for phishing or malware distribution. The PDF structure and embedded links suggest an attempt to trick users into downloading further malicious content or visiting phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://wastran.ru/uplcv?utm_term=pdf+reader+ubuntu+18.10
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/e1be849e03f5ed6672ff630282e355e5/50054461131.pdf
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f41704142d1---64415042880.pdf
    • http://dd-eng.com/files/files/58752452846.pdf
    • https://amitadevnani.com/userfiles/file/dafaragudokewok.pdf
    • http://neboskreb-irk.ru/uploads/userfiles/files/falepijamelapezomevunexo.pdf
    • http://guchenes.com/d/files/punemogegumajibasabipiz.pdf
    • https://pypconsultores.mx/userfiles/file/kujawolotexirekodobese.pdf
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/wufaj.pdf
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/68900570030.pdf
    • http://lueckerreunion2020.com/clients/e/eb/eba09433058400eda594a485f9004317/File/1691837680.pdf
    • https://valubil.com/public/uploads/cms_file/cms_files/10001399695.pdf
    • https://leavingcare3plus.ch/userfiles/files/pamifolapozol.pdf
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/d2524df6a33f194a03d121c13a5f6374/33306857484.pdf
    • http://iphonedown.com/ckfinder/userfiles/files/19280334066.pdf
    • http://nacnsuaa.com/clients/4/49/49ab1acc6c62b5a39110d621a19f71c0/File/72196804759.pdf
    • http://constantemails.com/userfiles/file/162520601711046447259.pdf
    • https://lederstuhlshop.de/ckfinder/userfiles/files/2992420934.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608420d99053d---woworobopanimazagiwob.pdf
    • http://jfac.kr/ckfinder/userfiles/files/43730894304.pdf
    • https://bearings.vn/images/ckeditor/files/53209786296.pdf
    • http://chukgoobok.com/files/fckeditor/file/18628847800.pdf
    • http://timebymtm.com/upload/files/14286854249.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086750909dfb---rakosapoduxuzamilunel.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/c3fa2795de6880d71bf9cd42675a624e/muzaru.pdf
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/mht826hi8073he0o3rmn5mtr9t/vumasukejopinetakitimo.pdf
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/3bkhvdtksgs0i8senh9a13l9al/74572045992.pdf
    • https://pergamine.com/ckfinder/userfiles/files/21237517809.pdf
    • https://alakharia.com/public_html/userfiles/file/konevavikufofarudadumi.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9dc.bin
4f2ad89b9a972652fba18c524e5f9792f388094e6ab8b355227951bf4a0e19e3
pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DC 10612 bytes
font_01_sfnt_off0000f250.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF250 16792 bytes
font_02_sfnt_off00010a62.bin
737ce0d095843da7065330bb256be7b8d2f9799cef9789b4b2a898a8cf26fa82
pdf-font-stream PDF embedded font (sfnt) at offset 0x10A62 16508 bytes