Malicious PDF — malware analysis report

Static analysis result for SHA-256 3912ada05fb2626b…

MALICIOUS

PDF

76.3 KB Created: 2021-09-21 00:52:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 69b9410af4e0e44992eca73a61d228c2 SHA-1: 2e24715f9cff275a07fb40a09907f25eba092172 SHA-256: 3912ada05fb2626bcf4630a1af8de8e273d8e5a8c545c5bf8cdb5233c557e4ed
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS uploads. The presence of JavaScript suggests an attempt to execute malicious code, likely to facilitate further compromise or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://myucpb.com/userfiles/file/lagazigokisariviteriwufu.pdf
    • https://nordavril.com/userfiles/file/wimalinetugoperipilufimu.pdf
    • http://rudolphalexander.com/uploads/files/bedodalepugeborovizowewu.pdf
    • http://clinicaveterinariailmarzocco.it/userfiles/files/zatudutit.pdf
    • http://pescepiana.eu/userfiles/files/suran.pdf
    • http://powerfalcon.net/uppic/files/dologexadumiluwejuj.pdf
    • http://katyababash.com/images/uploads/file/43014084270.pdf
    • http://dissanna.com/temp/fckeditor/file/35600035889.pdf
    • https://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148557814e71---kagaxovutevonova.pdf
    • http://sys-svinding.dk/userfiles/file/rikirarobifef.pdf
    • https://christianbelieversmatrimony.com/web/christiansbelieversmatrimony/photos/ckeditor/files/gozoti.pdf
    • http://rfaaa.com/UploadFile/file/20210917160213187.pdf
    • http://oldmotorsclub.com/files/file/pipagugabijoxiwowomexurud.pdf
    • http://globalsublimation.net/uploadfile/files/40781319511.pdf
    • http://electrogalicia.com/electrogalicia/recursos/archivos/10761773456.pdf
    • http://fteq.ru/files/file/bugixepadatoximod.pdf
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614478d0d6454---funoritide.pdf
    • http://grandrosso.com/js/upload/files/1470159688.pdf
    • http://interel-rus.ru/test/sites/default/files/file/84813611889.pdf
    • http://krakow4you.pl/krakow/files/40650837446.pdf
    • http://cinebuzz.be/uploads/userfiles/files/69851507771.pdf
    • http://oreoltour.ru/sites/default/files/file/fotojatunodaxuzugeder.pdf
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/cedb9617d493116427bfeefeee87c141/rugakeresuj.pdf
    • http://hfnhsw.com/upload/files/98400531174.pdf
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/9023adf2a8fad63ffb12465fe5eccec7/gepis.pdf
    • http://maivietnamesecotati.com/uploads/files/lukaliduvepugojunupa.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=android+pokemon+go+spoofing
    • 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_off0000c447.bin
3bc6980affdb4fd2e61bf6245de80a189961bf4c519cee65569e01f54999eb1d
pdf-font-stream PDF embedded font (sfnt) at offset 0xC447 10608 bytes
font_01_sfnt_off0000dc43.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC43 16792 bytes
font_02_sfnt_off0000f455.bin
21d1c2a07b090309252b297a2ddd707e25b845435d4ed4dde55f8d75a97bc1a4
pdf-font-stream PDF embedded font (sfnt) at offset 0xF455 18236 bytes